Sum of Even Numbers

In this challenge, you will practice using the for loop in Rust to iterate over a range of numbers. The goal is to sum all the even numbers within a given range.

The for loop in Rust is a powerful construct that allows you to iterate over collections, ranges, and iterators. It is commonly used for tasks such as summing numbers, collecting items, and more. By utilizing the for loop, you can write concise and readable code to perform repetitive tasks.

Your task

Your task is to implement a function sum_of_evens that takes two arguments, start and end, both of which are i32. The function should return the sum of all even numbers within the range [start, end] inclusive. If start is greater than end, the function should return 0.

Requirements

Use a for loop to iterate over the range from start to end.
Sum only the even numbers within the specified range.
If start is greater than end, return 0.

Example

let result = sum_of_evens(1, 10);
assert_eq!(result, 30); // 2 + 4 + 6 + 8 + 10 = 30
 
let result = sum_of_evens(5, 5);
assert_eq!(result, 0); // 5 is not even
 
let result = sum_of_evens(10, 1);
assert_eq!(result, 0); // start is greater than end

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Solutions

cj-catalan

17 hours ago

3.73ms

81.58kb

pub fn sum_of_evens(start: i32, end: i32) -> i32 {
    
    if start > end {
        return 0;
    }
    let mut sum = 0;
    for i in start..=end {
        if i & 1 == 0 {
            sum += i;
        }
    }
    sum
}

ikatlinsky

2 days ago

3.16ms

81.58kb

pub fn sum_of_evens(start: i32, end: i32) -> i32 {
    let mut sum = 0;
    for n in start..=end {
        if n % 2 == 0 {
            sum += n;
        }
    }
    return sum;
}

Aztra Corporation Inc.

AZTRA2022

3 days ago

3.87ms

81.58kb

pub fn sum_of_evens(start: i32, end: i32) -> i32 {
    let mut result = 0;
    if start > end {
        return 0; // Return 0 if start is greater than end
    }
    // Iterate over the range from start to end (inclusive)
    for i in start..=end {
        if i % 2 == 0 { // Check if the number is even
            result += i; // Add the even number to the result
        }
    }
    result 
}

Kr0wZ

3 days ago

3.87ms

81.58kb

pub fn sum_of_evens(start: i32, end: i32) -> i32 {
    // Your code here...
    let mut sum = 0;
    for i in start..=end {
        if i % 2 == 0 {
            sum += i
        }
        
    }
    sum
}

mathias dusautoy

pourquoi

5 days ago

3.40ms

81.58kb

pub fn sum_of_evens(start: i32, end: i32) -> i32 {
    let start = if start % 2 == 0 { start } else { start+1 };
    (start..=end).step_by(2).sum()
}

DoughRing

7 days ago

3.29ms

81.58kb

pub fn sum_of_evens(start: i32, end: i32) -> i32 {
    let mut sum: i32 = 0;
    for i in start..=end {
        if i%2 == 0 {
            sum +=i;
        }
    }
    return sum
}

Lucop1911

8 days ago

3.61ms

81.58kb

pub fn sum_of_evens(start: i32, end: i32) -> i32 {
    // Your code here...
    if start >= end { return 0 };
    let mut sum = 0; 
        for n in start..=end {
            if n%2 == 0 {
                sum+= n;
            }
        }
    return sum;
}

LeonardoPinheiro23

10 days ago

3.44ms

81.58kb

pub fn sum_of_evens(start: i32, end: i32) -> i32 {
    let mut sum = 0;
    for num in start..=end {
        if num % 2 == 0 {
            sum += num
        }
    }
    sum
}

AndrewDane

12 days ago

3.69ms

81.58kb

pub fn sum_of_evens(start: i32, end: i32) -> i32 {
    // Your code here...
    let mut sum = 0;
    if end <= start { return sum; } 
    else if end < 0 || start < 0 { return sum; }
    for i in sum..=end {
        if i % 2 == 0 {
            sum += i;
        }
    }
    sum
}

annececiledunand

13 days ago

3.21ms

81.58kb

pub fn sum_of_evens(start: i32, end: i32) -> i32 {
    if start > end {
        return 0;
    }
    
    let mut count = 0;
    for i in start..=end {
        if i % 2 == 0 {
            count += i
        }
        
    }
    count
}

Thibault Guimbert

TGuimbert

13 days ago

3.21ms

81.58kb

pub fn sum_of_evens(start: i32, end: i32) -> i32 {
    if start > end {
        return 0;
    } else {
        let mut result = 0;
        for i in start..end+1 {
            if i % 2 == 0 {
                result += i;
            }
        }
        return result;
    }
}

sjmellor

14 days ago

3.55ms

81.58kb

pub fn sum_of_evens(start: i32, end: i32) -> i32 {
    // Your code here...
    let mut sum: i32 = 0;
    for i in start..=end {
        if i % 2 == 0 { sum += i; }
    }
    sum
}

ohernandez93

hdezoscar93

14 days ago

3.10ms

81.58kb

pub fn sum_of_evens(start: i32, end: i32) -> i32 {
    // Your code here...
    if start > end {
        return 0;
    }
    else if start == end {
        return 0;
    }else{
        let mut result = 0;
        for numero in start..=end{
             if numero%2 == 0 {
                result += numero;
             }
        }
        return result as i32;
    }
}

Maicon Crespo

maiconcrespo

17 days ago

4.07ms

81.58kb

pub fn sum_of_evens(start: i32, end: i32) -> i32 {
    if start>end{return 0}
    let mut sum = 0;
    for n in start..end+1{
      if n % 2 == 0{
        sum += n}
     }
     return sum;
}

ggnne

19 days ago

3.36ms

81.58kb

pub fn sum_of_evens(start: i32, end: i32) -> i32 {
    // Your code here...
    (start..end+1).into_iter().filter(|x| x % 2 == 0).fold(0, |acc, x| acc + x)
}

Tommytto

20 days ago

3.88ms

81.58kb

pub fn sum_of_evens(start: i32, end: i32) -> i32 {
    // Your code here...
    if start > end {
        return 0;
    }
    let mut sum = 0;
    for num in start..end+1 {
        if num % 2 == 0 {
            sum += num;
        }
    }
    return sum;
}

Alexander Y

unixander

22 days ago

4.09ms

81.58kb

pub fn sum_of_evens(start: i32, end: i32) -> i32 {
    (start..=end).into_iter().filter(|x| x % 2 == 0).sum()
}

Viktor Merkurev

fennr

23 days ago

4.05ms

81.58kb

pub fn sum_of_evens(start: i32, end: i32) -> i32 {
    // Your code here...
    (start..=end)
        .filter(|x| x % 2 == 0)
        .sum()
}

Viktor Merkurev

fennr

23 days ago

4.28ms

81.58kb

pub fn sum_of_evens(start: i32, end: i32) -> i32 {
    // Your code here...
    (start..=end).into_iter()
        .filter(|x| x % 2 == 0)
        .sum()
}

Anatma2

23 days ago

7.87ms

81.58kb

pub fn sum_of_evens(start: i32, end: i32) -> i32 
{
    if start > end{return 0}
    
    let mut result:i32 =0;
    for n in start..(end+1)
    {
        if n % 2 == 0
            {result += n}
    }
    result
}

Anatma2

23 days ago

6.57ms

81.58kb

pub fn sum_of_evens(start: i32, end: i32) -> i32 
{
    let mut result:i32 =0;
    if start > end{return 0}
    for n in start..(end+1){
        if n % 2 == 0
            {result += n}
    }
    result
}

shibu-t

a month ago

4.56ms

81.58kb

pub fn is_even(n: i32) -> bool {
    if n % 2 == 0 {
        return true;
    } else {
        return false;
    }
}
pub fn sum_of_evens(start: i32, end: i32) -> i32 {
    let mut sum = 0;
    if end < start {
        return 0;
    }
    for i in start..=end {
        if is_even(i) {
            sum += i;
        }
    }
    sum
}

Melkii-Mel

a month ago

3.60ms

81.58kb

pub fn sum_of_evens(start: i32, end: i32) -> i32 {
    (start..=end).filter(|n| n % 2 == 0).sum()
}

Holger Knauer

hknauer

a month ago

4.04ms

81.58kb

pub fn sum_of_evens(start: i32, end: i32) -> i32 {
    // Your code here...
    if start > end {
        return 0;
    }
    (start..=end).filter(|x| x%2==0).sum()
}

Degisew Mengist

degisew

a month ago

3.29ms

81.58kb

pub fn sum_of_evens(start: i32, end: i32) -> i32 {
    // Your code here...
    let mut total: i32 = 0;
    if start > end {
        0
    }else {
        for i in start..=end {
            if i % 2 == 0 {
                total += i
            }
    }
        total
    }
}

Degisew Mengist

degisew

a month ago

3.63ms

81.58kb

pub fn sum_of_evens(start: i32, end: i32) -> i32 {
    // Your code here...
    let mut total: i32 = 0;
    if start > end {
        0
    }else {
        for i in start..=end {
            if i % 2 == 0 {
                total += i
            }
    }
        total
    }
}

Wenceslas E. Jonah

WencesJ

a month ago

4.83ms

81.58kb

pub fn sum_of_evens(start: i32, end: i32) -> i32 {
    // Your code here...
    // if start > end { return 0 };
    // let mut sum = 0;
    // for i in start..=end {
    //     if i % 2 == 0 { sum += i }
    // };
    // sum
    (start..=end).into_iter().filter(|num| num % 2 == 0).sum()
}

Venkata Naga Ravikiran Bulusu

ravikiranbvn

a month ago

3.92ms

81.58kb

pub fn sum_of_evens(start: i32, end: i32) -> i32 {
    if end < start{return 0}
    let mut s = 0;
    for i in start..=end{
        if i%2==0{s+=i;}
    }
    s
}

Liyqq

a month ago

4.39ms

81.58kb

pub fn sum_of_evens(start: i32, end: i32) -> i32 {
    // Your code here...}
    (start..=end).into_iter().filter(|n| n % 2 == 0).sum()
}

Rajat Sharma

rajatsharma

2 months ago

4.69ms

81.58kb

pub fn sum_of_evens(start: i32, end: i32) -> i32 {
    if start > end {
        return 0;
    }
    let mut sum = 0;
    for n in start..=end {
        if n % 2 == 0 {
            sum = sum + n;
        }
    }
    sum
}

wertion555

2 months ago

3.48ms

81.58kb

pub fn sum_of_evens(start: i32, end: i32) -> i32 {
    if end < start{return 0}
    (start..=end).filter(|&x| x % 2 == 0).sum()
}

wertion555

2 months ago

3.51ms

81.58kb

pub fn sum_of_evens(start: i32, end: i32) -> i32 {
    if end < start{return 0}
    let mut s = 0;
    for i in start..=end{
        if i%2==0{s+=i;}
    }
    s
}

Hung Dinh

nhdinh

2 months ago

4.35ms

81.58kb

pub fn sum_of_evens(start: i32, end: i32) -> i32 {
    // Your code here...
    let mut ans = 0_i32;
    for n in start..=end {
        if n % 2 == 0 {
            ans += n;
        }
    }
    ans
}

Franklyne

fnamayi

2 months ago

3.82ms

81.58kb

pub fn sum_of_evens(start: i32, end: i32) -> i32 {
    if start > end {
        return 0;
    }
    let mut count: i32 = 0;
    let mut i = if start % 2 == 0 { start } else { start + 1 };
    while i <= end {
        count += i;
        i += 2;
    }
    return count;
}

Franklyne

fnamayi

2 months ago

4.04ms

81.58kb

pub fn sum_of_evens(start: i32, end: i32) -> i32 {
    // Your code here...
   if start > end{
    return 0
   }
   let mut count: i32 = 0;
   for i in start..=end{
    if i % 2 == 0{
        count += i;
    }
   }
   return count
}

Jakub Wiśniewski

wisniewskij

2 months ago

3.73ms

81.58kb

pub fn sum_of_evens(start: i32, end: i32) -> i32 {
    let mut sum: i32 = 0;
    for i in (start..=end) {
        if i % 2 == 0 {
            sum += i;
        }
    }
    return sum;
}

Jason

Jason-fy-wang

2 months ago

4.20ms

81.58kb

pub fn sum_of_evens(start: i32, end: i32) -> i32 {
    // Your code here...
    (start..=end)
        .filter(|&x| x % 2 == 0)
        .sum()
}

Jason

Jason-fy-wang

2 months ago

3.21ms

81.58kb

pub fn sum_of_evens(start: i32, end: i32) -> i32 {
    // Your code here...
    let mut sum = 0;
    for i in start..=end {
        if i % 2 == 0 {
            sum += i;
        }
    }
    sum
}

MrGru

2 months ago

6.30ms

81.58kb

pub fn sum_of_evens(start: i32, end: i32) -> i32 {
    // Your code here...
    let mut sum = 0;
    for i in start..=end {
        if i % 2 == 0 {
            sum += i;
        }
    }
    sum
}

1mstupid

2 months ago

3.31ms

81.58kb

pub fn sum_of_evens(start: i32, end: i32) -> i32 {
    let mut sum:i32 = 0;
    for i in start..=end {
        if i % 2 == 0 {
            sum += i;
        }
    }
    sum
    
}

Pycub

pycub

2 months ago

4.73ms

81.58kb

pub fn sum_of_evens(start: i32, end: i32) -> i32 {
    let mut out: i32 = 0;
    for n in start..end+1 {
        if n % 2 == 0 {
            out += n;
        }
    }
    out
}

Pycub

pycub

2 months ago

4.02ms

87.39kb

pub fn sum_of_evens(start: i32, end: i32) -> i32 {
    if start > end {
        return 0;
    }
    let numbers: Vec<i32> = (start..=end).collect();
    numbers.iter().filter(|&n| n % 2 == 0).sum()
}

mhd242006

2 months ago

6.36ms

81.58kb

pub fn sum_of_evens(start: i32, end: i32) -> i32 {
    // Your code here...
    let mut sum: i32 =0;
    for n in start..end+1{
        if n % 2 == 0 {
         sum += n;
        }
    }
    sum
}

roboquaternion

2 months ago

5.19ms

81.58kb

pub fn sum_of_evens(start: i32, end: i32) -> i32 {
    // Your code here...
    // If start is odd then increment by 1.
    let mut begin = start;
    if begin % 2 == 1 {
        begin = begin + 1;
    }
    (begin..=end).filter(|x| (x % 2==0) ).sum()
}

roboquaternion

2 months ago

36.36ms

81.58kb

pub fn sum_of_evens(start: i32, end: i32) -> i32 {
    // Your code here...
    // If start is odd then increment by 1.
    let mut begin = start;
    if begin % 2 == 1 {
        begin = begin + 1;
    }
    (begin..=end).filter(|x| (x % 2==0) ).sum()
}

Deaddy3

2 months ago

3.30ms

81.58kb

pub fn sum_of_evens(start: i32, end: i32) -> i32 {
    // Your code here...
    let mut sum: i32 = 0;
    for number in (start..end+1) {
        if number % 2 == 0 {
            sum += number;
        }
    }
    sum
}

vijayabhaskar badireddi

ptcte

2 months ago

3.00ms

81.58kb

pub fn sum_of_evens(start: i32, end: i32) -> i32 {
    // Your code here...
    let mut sum: i32 = 0;
    for n in (start..=end) {
        if n % 2 == 0 {
            sum += n;
        }
    }
    sum
}

Aurimas Kuniutis

auriku

3 months ago

4.32ms

81.58kb

    pub fn sum_of_evens(start: i32, end: i32) -> i32 {
        let mut sum_of_evens = 0;
        if start > end {
            sum_of_evens
        } else {
            for n in start..=end {
                if n % 2 == 0 {
                    sum_of_evens += n;
                }
            }
            sum_of_evens
        }
    }

Jason

chenjie1219

3 months ago

11.42ms

81.58kb

pub fn sum_of_evens(start: i32, end: i32) -> i32 {
    (start..=end).filter(|x| x % 2 == 0).sum()
}

Jason

chenjie1219

3 months ago

4.42ms

81.58kb

pub fn sum_of_evens(start: i32, end: i32) -> i32 {
    let mut sum = 0;
    for i in start..=end {
        if i % 2 == 0 {
            sum += i;
        }
    }
    sum
}