Determine Number Characteristics

In this challenge, you will create a function that determines the characteristics of a given number. Specifically, the function will evaluate whether a number is positive negative, or zero and also determine if it is even or odd.

Rust's powerful control flow mechanisms, including if, else if, and else statements, make it easy to handle multiple conditions. By combining these conditions with logical operators, you can create a function that provides comprehensive information about the number.

Your task

You are given a function describe_number(n: i32) -> String that takes an integer as input and returns a string description of the number's characteristics. The description should include whether the number is positive, negative, or zero and whether it is even or odd.

For example:

"Positive even"
"Positive odd"
"Negative even"
"Negative odd"
"Zero"

Complete the function by implementing the necessary conditions and logical checks.

Requirements

If the number is positive and even, return "Positive even".
If the number is positive and odd, return "Positive odd".
If the number is negative and even, return "Negative even".
If the number is negative and odd, return "Negative odd".
If the number is zero, return "Zero".

Example

let result = describe_number(10);
assert_eq!(result, "Positive even");
 
let result = describe_number(-3);
assert_eq!(result, "Negative odd");
 
let result = describe_number(0);
assert_eq!(result, "Zero");

Hints

Remember that the modulus operator % can help determine if a number is even or odd.
Logical operators && and || will be useful for combining conditions.
Consider the order of your conditions to ensure the correct output.

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Solutions

ikatlinsky

2 days ago

3.18ms

87.35kb

pub fn describe_number(n: i32) -> String {
    match n {
        0 => String::from("Zero"),
        n if n > 0 && n % 2 == 0 => String::from("Positive even"),
        n if n > 0 && n % 2 != 0 => String::from("Positive odd"),
        n if n < 0 && n % 2 == 0 => String::from("Negative even"),
        n if n < 0 && n % 2 != 0 => String::from("Negative odd"),
        _ => panic!("unknown case")
    }
}

Aztra Corporation Inc.

AZTRA2022

2 days ago

4.11ms

87.35kb

pub fn describe_number(number: i32) -> String {
    if number != 0 && number % 2 ==0 {
        if number > 0 {
            "Positive even".to_string()
        }else{
            "Negative even".to_string()
        }
    }else if number != 0 && number % 2 != 0 {
        if number > 0 {
            "Positive odd".to_string()
        }else{
            "Negative odd".to_string()
        }
    }else{
        "Zero".to_string()
    }
}

Enriko

rix71

7 days ago

3.38ms

87.35kb

pub fn describe_number(n: i32) -> String {
    const DESCRIPTION: [&str; 5] = ["Zero", "Negative odd", "Negative even", "Positive odd", "Positive even"];
    let idx = (2 * (n > 0) as usize + ((n % 2) == 0) as usize + 1) * (n != 0) as usize;
    return DESCRIPTION[idx].to_string()
}

LeonardoPinheiro23

10 days ago

3.83ms

87.35kb

const EVEN_STR: &'static str = "even";
const ODD_STR: &'static str = "odd";
const POSITIVE_STR: &'static str = "Positive";
const NEGATIVE_STR: &'static str = "Negative";
pub fn describe_number(n: i32) -> String {
    if n == 0 {
        return "Zero".into();
    }
    let sign = if n > 0 {
        POSITIVE_STR
    } else {
        NEGATIVE_STR
    };
    let parity = if n % 2 == 0 {
        EVEN_STR
    } else {
        ODD_STR
    };
    format!("{sign} {parity}")
}

annececiledunand

13 days ago

3.49ms

87.35kb

pub fn describe_number(n: i32) -> String {
    if n == 0 {
        return String::from("Zero");
    }
    
    let sign: &str = if n > 0 { "Positive" } else { "Negative" };
    let div: &str = if n % 2 == 0 { "even"  } else { "odd" };
    
    return format!("{sign} {div}");
}

sjmellor

13 days ago

3.17ms

87.35kb

pub fn describe_number(n: i32) -> String {
    // TODO: Implement the function here
    if n == 0  { 
        return "Zero".to_string()
    }
    let even = n % 2 == 0;
    let positive = n > 0;
    if positive {
        if even {
            return "Positive even".to_string()
        }
        else {
            return "Positive odd".to_string()
        }
    }
    else {
        if even {
            return "Negative even".to_string()
        }
        else {
            return "Negative odd".to_string()
        }
    }
}

ggnne

17 days ago

3.34ms

87.35kb

pub fn describe_number(n: i32) -> String {
    // TODO: Implement the function here
    if n == 0 {
        "Zero".to_string()
    } else if n > 0 && n % 2 == 0 {
        "Positive even".to_string()
    } else if n > 0 && n % 2 != 0 {
        "Positive odd".to_string()
    } else if n < 0 && n % 2 == 0 {
        "Negative even".to_string()
    } else {
        "Negative odd".to_string()
    }
}

Tommytto

20 days ago

3.56ms

87.41kb

pub fn describe_number(n: i32) -> String {
    // TODO: Implement the function here
    if n == 0 {
        "Zero".to_string()
    } else {
        let mut list = vec![];
        if n < 0 {
            list.push("Negative")
        } else {
            list.push("Positive")
        }
        if n % 2 == 0 {
            list.push("even")
        } else {
            list.push("odd")
        }
        list.join(" ")
    }
}

Viktor Merkurev

fennr

23 days ago

3.53ms

87.35kb

pub fn describe_number(n: i32) -> String {
    // TODO: Implement the function here
    if is_zero(n) {
        return "Zero".to_string()
    }
    match (is_positive(n), is_even(n)) {
        (true, true) => "Positive even".to_string(),
        (true, false) => "Positive odd".to_string(),
        (false, true) => "Negative even".to_string(),
        (false, false) => "Negative odd".to_string(),
    }
}
fn is_positive(n: i32) -> bool {
    n > 0
}
fn is_even(n: i32) -> bool {
    n % 2 == 0
}
fn is_zero(n: i32) -> bool {
    n == 0
}

Anatma2

23 days ago

4.50ms

87.35kb

pub fn describe_number(n: i32) -> String {
    if n == 0 {
        return "Zero".to_string();
    }
    let mut result = if n.abs() == n {
        "Positive ".to_string()
    } else {
        "Negative ".to_string()
    };
    if n % 2 == 0 {
        result.push_str("even");
    } else {
        result.push_str("odd");
    }
    result
}

Liyqq

a month ago

3.26ms

87.35kb

use std::cmp::Ordering;
pub fn describe_number(n: i32) -> String {
    // TODO: Implement the function here
    let is_even = n & 1 == 0;
    match (n.cmp(&0), is_even) {
        (Ordering::Equal, _) => "Zero".to_string(),
        (Ordering::Greater, true) => "Positive even".to_string(),
        (Ordering::Greater, false) => "Positive odd".to_string(),
        (Ordering::Less, true) => "Negative even".to_string(),
        (Ordering::Less, false) => "Negative odd".to_string(),
    }
}

wertion555

2 months ago

4.26ms

87.35kb

pub fn describe_number(n: i32) -> String {
    if n == 0{return "Zero".to_string()}
    else {return String::from(if n > 0 {"Positive "} else {"Negative "}) + (if n % 2 == 0 {"even"} else {"odd"})}
}

Hung Dinh

nhdinh

2 months ago

3.83ms

87.35kb

use std::cmp::Ordering;
pub fn describe_number(n: i32) -> String {
    // TODO: Implement the function here
    return match n.cmp(&0) {
        Ordering::Less => match n % 2 {
            0 => "Negative even",
            _ => "Negative odd",
        },
        Ordering::Greater => match n % 2 {
            0 => "Positive even",
            _ => "Positive odd",
        },
        _ => "Zero"
    }.to_string();
}

roboquaternion

2 months ago

3.83ms

87.35kb

pub fn describe_number(n: i32) -> String {
    // TODO: Implement the function here
    // Check a tuple of (is_zero, is_positive, is_even)
    match (n==0, n>0, n%2==0) {
        (true, _,  _)     => return String::from("Zero"),
        (_, true,  true)  => return String::from("Positive even"),
        (_, true,  false) => return String::from("Positive odd"),
        (_, false, true)  => return String::from("Negative even"),
        (_, false, false) => return String::from("Negative odd"),
    }
}

MrGru

2 months ago

3.07ms

87.35kb

pub fn describe_number(n: i32) -> String {
    // TODO: Implement the function here
    match n {
        n if n > 0 && n % 2 == 0 => "Positive even".to_string(),
        n if n > 0 && n % 2 == 1 => "Positive odd".to_string(),
        n if n < 0 && n % 2 == 0 => "Negative even".to_string(),
        n if n < 0 && n % 2 == -1 => "Negative odd".to_string(),
        _ => "Zero".to_string()
    }
}

John Adams

netik

2 months ago

6.03ms

81.58kb

pub fn describe_number(n: i32) -> String {
    // TODO: Implement the function here
    match n {
        n if n > 0 => String::from(format!("Positive {}", if n % 2 == 0{"even"} else {"odd"})),
        n if n < 0 => String::from(format!("Negative {}", if n % 2 == 0{"even"} else {"odd"})),
            
        _ => String::from("Zero"),  
    }
}

Jakub Wiśniewski

wisniewskij

2 months ago

10.57ms

87.35kb

pub fn describe_number(n: i32) -> String {
    let even: bool = n % 2 == 0;
    if n > 0 {
       "Positive ".to_string() + if even {"even"} else {"odd"}
    } else if n < 0 {
       "Negative ".to_string() + if even {"even"} else {"odd"}
    } else {
        "Zero".to_string()
    }
    // TODO: Implement the function here
}

Jason

Jason-fy-wang

2 months ago

3.87ms

87.35kb

pub fn describe_number(n: i32) -> String {
    // TODO: Implement the function here
    match n {
        0 => "Zero".to_string(),
        w if w > 0 => {
            if w % 2 == 0 {
                "Positive even".to_string()
            } else {
                "Positive odd".to_string()
            }
        },
        w if w < 0 => {
            if w % 2 == 0 {
                "Negative even".to_string()
            } else {
                "Negative odd".to_string()
            }
        },
        _ => "no reach".to_string(),
    }
}

mhd242006

2 months ago

4.02ms

87.35kb

pub fn describe_number(n: i32) -> String {
    // TODO: Implement the function here
        if n > 0{
            if n % 2 == 0 {
                return String::from("Positive even");
            } else {
                return String::from("Positive odd");
            }
        } else if n < 0 {
            if n % 2 == 0 {
                return String::from("Negative even");
            } else {
                return String::from("Negative odd");
            }
        } else {
            return String::from("Zero");
        }
}

Deaddy3

2 months ago

3.73ms

87.35kb

pub fn describe_number(n: i32) -> String {
    // TODO: Implement the function here
    if n == 0 {
        return String::from("Zero")
    }
    let mut returnstr = String::new();
    if n > 0 {
        returnstr.push_str("Positive ");
    } else {
        returnstr.push_str("Negative ");
    }
    if n % 2 == 0 {
        returnstr.push_str("even");
    } else {
        returnstr.push_str("odd");
    }
    returnstr
}

vijayabhaskar badireddi

ptcte

2 months ago

4.04ms

87.35kb

pub fn describe_number(n: i32) -> String {
    // TODO: Implement the function here
    if n > 0 {
        if n % 2 == 0 {
            String::from("Positive even")
        } else {
            String::from("Positive odd")
        }
    } else if n < 0 {
        if (-1*n) % 2 == 0 {
            String::from("Negative even")
        } else {
            String::from("Negative odd")
        }
    } else {
        String::from("Zero")
    }
}

Aurimas Kuniutis

auriku

2 months ago

4.50ms

81.58kb

pub fn describe_number(n: i32) -> String {
    // TODO: Implement the function here
    match n {
        n if n > 0 => String::from(format!("Positive {}", if n % 2 == 0{"even"} else {"odd"})),
        n if n < 0 => String::from(format!("Negative {}", if n % 2 == 0{"even"} else {"odd"})),
            
        _ => String::from("Zero"),  
    }
}

Aurimas Kuniutis

auriku

2 months ago

3.62ms

87.35kb

    pub fn describe_number(n: i32) -> String {
        if n > 0{
            if n % 2 == 0 {
                return String::from("Positive even");
            } else {
                return String::from("Positive odd");
            }
        } else if n < 0 {
            if n % 2 == 0 {
                return String::from("Negative even");
            } else {
                return String::from("Negative odd");
            }
        } else {
            return String::from("Zero");
        }
    }

Jason

chenjie1219

3 months ago

3.93ms

87.35kb

pub fn describe_number(n: i32) -> String {
    if n == 0 {
        return "Zero".into();
    }
    let s1 = if n < 0 { "Negative" } else { "Positive" };
    let s2 = if n % 2 == 0 { "even" } else { "odd" };
    format!("{s1} {s2}")
}

Marcel Schiffel

mschiffel

3 months ago

3.94ms

87.35kb

pub fn describe_number(n: i32) -> String {
    if n == 0 {
        return "Zero".into();
    }
    let s1 = if n < 0 { "Negative" } else { "Positive" };
    let s2 = if n % 2 == 0 { "even" } else { "odd" };
    format!("{s1} {s2}")
}

syberianbull

3 months ago

3.63ms

87.35kb

pub fn describe_number(n: i32) -> String {
    // TODO: Implement the function here
    match (n, n < 0, n % 2 == 0) {
        (0, _, _) => "Zero".to_string(),
        (_, false, true) => "Positive even".to_string(),
        (_, false, false) => "Positive odd".to_string(),
        (_, true, true) => "Negative even".to_string(),
        (_, true, false) => "Negative odd".to_string(),
    }
}

endrin

3 months ago

4.09ms

87.35kb

pub fn describe_number(n: i32) -> String {
    if n == 0 {
        return String::from("Zero");
    }
    let sign = match n >> 31 {
        0 => "Positive",
        -1 => "Negative",
        _ => unreachable!(),
    };
    let odd_or_even = match n & 1 {
        0 => "even",
        1 => "odd",
        _ => unreachable!(),
    };
    format!("{} {}", sign, odd_or_even)
}

endrin

3 months ago

3.62ms

87.35kb

pub fn describe_number(n: i32) -> String {
    let sign = 
        if n > 0 { "Positive"}
        else if n < 0 { "Negative" }
        else { "Zero" };
    
    let odd_or_even = 
        if n == 0 { "" }
        else if n % 2 != 0 { " odd" }
        else { " even" };
    format!("{}{}", sign, odd_or_even)
}

VerweyFr

3 months ago

4.63ms

87.35kb

pub fn describe_number(n: i32) -> String {
    match n {
        x if x > 0 && x % 2 == 0 => String::from("Positive even"),
        x if x < 0 && x % 2 == 0 => String::from("Negative even"),
        x if x > 0 && x % 2 != 0 => String::from("Positive odd"),
        x if x < 0 && x % 2 != 0 => String::from("Negative odd"),
        _ => String::from("Zero"),
    }
}

Yixian Du

duyixian1234

3 months ago

3.60ms

87.35kb

pub fn describe_number(n: i32) -> String {
    // TODO: Implement the function here
    if n == 0 {
        return "Zero".to_string();
    } else if n > 0 {
        if n % 2 != 0 {
            return "Positive odd".to_string();
        } else {
            return "Positive even".to_string();
        }
    } else {
        if n % 2 != 0 {
            return "Negative odd".to_string();
        } else {
            return "Negative even".to_string();
        }
    }
}

delxs

3 months ago

3.36ms

87.35kb

pub fn describe_number(n: i32) -> String {
    // TODO: Implement the function here
    if n == 0 {
        return "Zero".to_string();
    } else if n > 0 {
        if n % 2 != 0 {
            return "Positive odd".to_string();
        } else {
            return "Positive even".to_string();
        }
    } else {
        if n % 2 != 0 {
            return "Negative odd".to_string();
        } else {
            return "Negative even".to_string();
        }
    }
}

Artem

tich31337

3 months ago

4.62ms

87.35kb

pub fn describe_number(n: i32) -> String {
    // TODO: Implement the function here
    if n == 0 {
        "Zero".to_string()
    } else {
    match (n > 0, n % 2) {
        (true, 0) => "Positive even".to_string(),
        (true, _) => "Positive odd".to_string(),
        (false, 0) => "Negative even".to_string(),
        (false, _) => "Negative odd".to_string(),
    }
    }
}

lugtester

3 months ago

3.24ms

87.35kb

pub fn describe_number(n: i32) -> String {
    // TODO: Implement the function here
    if n == 0 {
        return "Zero".to_string();
    }
    match n > 0 {
        true => match n % 2 == 0 {
            true => "Positive even".to_string(),
            false => "Positive odd".to_string(),
        },
        false => match n % 2 == 0 {
            true => "Negative even".to_string(),
            false => "Negative odd".to_string(), 
        }
    }
}

panda wiz

pandamrx

3 months ago

4.43ms

87.35kb

pub fn describe_number(n: i32) -> String {
    // TODO: Implement the function here
    if n == 0 {
        return String::from("Zero");
    } else if n % 2 == 0 {
        if n > 0 {
            return String::from("Positive even");
        }
        return String::from("Negative even");
    }
    if n > 0 {
        return String::from("Positive odd");
    }
    return String::from("Negative odd");
}

hex-order

idan-KH

3 months ago

3.17ms

87.35kb

pub fn describe_number(n: i32) -> String {
    // TODO: Implement the function here
    
    if n == 0 {
        return String::from("Zero");
    }
    let mut s =  String::from("");
    if n > 0 {
        s.push_str("Positive");
    } else {
        s.push_str("Negative");
    }
    if n % 2 == 0 {
        s.push_str(" even");
    } else {
        s.push_str(" odd");
    }
    
    return s;
}

Anna Komarova

Vlasanya

3 months ago

3.89ms

87.35kb

pub fn describe_number(n: i32) -> String {
  if n == 0 {
        "Zero".to_string()
    } else if n > 0 {
        if n % 2 == 0 {
            "Positive even".to_string()
        } else {
            "Positive odd".to_string()
        }
    } else { 
        if n % 2 == 0 {
            "Negative even".to_string()
        } else {
            "Negative odd".to_string()
        }
    }
}

Icarus

IcarusxB

3 months ago

3.89ms

87.35kb

pub fn describe_number(n: i32) -> String {
    if n == 0 {
        return "Zero".to_string();
    }
    let sign = if n > 0 { "Positive" } else { "Negative" };
    let pair = if n % 2 == 0 { "even" } else { "odd" };
    
    format!("{} {}", sign, pair)
}

no-yan

3 months ago

4.71ms

87.35kb

pub fn describe_number(n: i32) -> String {
    // TODO: Implement the function here
    if n == 0 {
        return "Zero".to_string()
    }
    match (n>0, n%2) {
        (true, 0) => "Positive even".to_string(),
        (true, 1) => "Positive odd".to_string(),    
        (false, 0) => "Negative even".to_string(),
        (false, -1) => "Negative odd".to_string(),
        _ => "Invalid".to_string()
    }
}

AnKarl

Zythophilus

3 months ago

9.43ms

87.35kb

pub fn describe_number(n: i32) -> String {
    // TODO: Implement the function here
    if n > 0 {
        if n % 2 == 0 {
            return String::from("Positive even")
        } else {
            return String::from("Positive odd")
        }
    }
    if n < 0 {
        if n % 2 == 0 {
            return String::from("Negative even")
        } else {
            return String::from("Negative odd")
        }
    }
    String::from("Zero")
}

Dhananjay Pandit

djpandit007

3 months ago

4.54ms

87.35kb

pub fn describe_number(n: i32) -> String {
    // TODO: Implement the function here
    if n == 0 {
        return String::from("Zero");
    } else if n < 0 {
        if n % 2 == 0 {
            return String::from("Negative even");
        }
        return String::from("Negative odd");
    } else {
        if n % 2 == 0 {
            return String::from("Positive even");
        }
        return String::from("Positive odd");
    }
}

hemulya

3 months ago

3.31ms

87.35kb

pub fn describe_number(n: i32) -> String {
    if n == 0 {
        "Zero".into()
    } else if n > 0 {
        if n % 2 == 0 {
            "Positive even".into()
        } else {
            "Positive odd".into()
        }
    } else {
        if n % 2 == 0 {
            "Negative even".into()
        } else {
            "Negative odd".into()
        }
    }
}

vojta stefan

vojtastefan

3 months ago

3.77ms

87.35kb

pub fn describe_number(n: i32) -> String {
    // TODO: Implement the function here
     match n {
        n if n > 0 && n % 2 == 0 => "Positive even".into(),
        n if n > 0 && n % 2 != 0 => "Positive odd".into(),
        n if n < 0 && n % 2 == 0 => "Negative even".into(),
        n if n < 0 && n % 2 != 0 => "Negative odd".into(),
        _ => "Zero".into(),
    }
}

Ayushman Rathore

Spartan09

4 months ago

3.66ms

87.35kb

pub fn describe_number(n: i32) -> String {
    match (0 == n, n < 0, 0 == n % 2) {
		(true, _, _) => "Zero".to_string(),
		(_, true, false) => "Negative odd".to_string(),
		(_, true, true) => "Negative even".to_string(),
		(_, false, false) => "Positive odd".to_string(),
		(_, false, true) => "Positive even".to_string()
	}
}

Lucas Deprit

lucasdeprit

4 months ago

7.96ms

87.35kb

pub fn describe_number(n: i32) -> String {
    match n {
        n if n > 0 => { 
            if even(n) {return String::from("Positive even");}
            return String::from("Positive odd");
        },
        n if n < 0 => {
            if even(n) {return String::from("Negative even");}
            return String::from("Negative odd");
        },
        _ => String::from("Zero"),
    }
}
    fn even(n: i32) -> bool {
        if n % 2 == 0 { return true; }
        false
    }

Lucas Deprit

lucasdeprit

4 months ago

3.37ms

87.35kb

pub fn describe_number(n: i32) -> String {
    match n {
        n if n > 0 => { 
            if even(n) {return String::from("Positive even");}
            return String::from("Positive odd");
        },
        n if n < 0 => {
            if even(n) {return String::from("Negative even");}
            return String::from("Negative odd");
        },
        _ => String::from("Zero"),
    }
}
    fn even(n: i32) -> bool {
        if n % 2 == 0 { return true; }
        false
    }

Lucas Deprit

lucasdeprit

4 months ago

3.69ms

87.35kb

pub fn describe_number(n: i32) -> String {
    match n {
        0 => String::from("Zero"),
        n if n % 2 == 0 => { 
            if n > 0 {return String::from("Positive even");}
            return String::from("Negative even");
        },
        _ => {
            if n > 0 {return String::from("Positive odd");}
            return String::from("Negative odd");
        }
    }
}

Manuel Manjarres R.

manuelmj

4 months ago

3.35ms

81.58kb

pub fn describe_number(n: i32) -> String {
    // TODO: Implement the function here
    match n {
        n if n > 0 => String::from(format!("Positive {}", if even_or_odd(n){"even"} else {"odd"})),
        n if n < 0 => String::from(format!("Negative {}", if even_or_odd(n){"even"} else {"odd"})),
            
        _ => String::from("Zero"),  
    }
}
fn even_or_odd(number : i32)-> bool {
    if number % 2 == 0 {
        return true 
    }
    false 
}

Éric Villani

TheTrueCaligari

4 months ago

4.18ms

87.35kb

pub fn describe_number(n: i32) -> String {
    if n>0 {
        if n % 2 == 0 {
            "Positive even".to_string()
        } else {
            "Positive odd".to_string()
        } 
    } else if n<0 {
        if n % 2 == 0 {
            "Negative even".to_string()
        } else {
            "Negative odd".to_string()
        } 
    } else {
        "Zero".to_string()
    }
}

Yi Hao

leongyihao

4 months ago

3.38ms

87.35kb

pub fn describe_number(n: i32) -> String {
	match (0 == n, n < 0, 0 == n % 2) {
		(true, _, _) => "Zero".to_string(),
		(_, true, false) => "Negative odd".to_string(),
		(_, true, true) => "Negative even".to_string(),
		(_, false, false) => "Positive odd".to_string(),
		(_, false, true) => "Positive even".to_string()
	}
}

Jordan

Jordan-Haidee

4 months ago

4.96ms

87.35kb

pub fn describe_number(n: i32) -> String {
    // TODO: Implement the function here
    match n {
        x if x > 0 && x % 2 == 0 => "Positive even".to_owned(),
        x if x > 0 && x % 2 != 0 => "Positive odd".to_owned(),
        x if x < 0 && x % 2 == 0 => "Negative even".to_owned(),
        x if x < 0 && x % 2 != 0 => "Negative odd".to_owned(),
        _ => "Zero".to_owned(), 
    }
}