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

Editor not available on Mobile!

In order to solve the challenge, please visit this page on a desktop computer.

Solutions

Ramon Silva

rsilva1

2 hours ago

3.26ms

81.58kb

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

emiludenz

a day ago

3.09ms

81.58kb

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

Marouan Boulahtouf

MBoulahtouf

2 days ago

3.33ms

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 
}

azmahflameheart

3 days ago

3.44ms

81.58kb

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

Holly Gent

PointlessParrot

4 days ago

3.16ms

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
}

vivek

vivek-inavalli

4 days ago

3.06ms

81.58kb

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

Egu0

egu0

6 days ago

3.07ms

81.58kb

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

Sheren Yogesh Narayanan

Nsy97

6 days ago

3.95ms

81.58kb

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

makinpaper

8 days ago

3.41ms

81.58kb

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

Asrul Firdaus

AsrulF

9 days ago

3.49ms

81.58kb

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

basiek97

10 days ago

3.28ms

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
}

SpontaneousOverthrow

10 days ago

4.16ms

81.58kb

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

exeris

11 days ago

2.90ms

81.58kb

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

miel-codeai

13 days ago

3.40ms

81.58kb

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

Kishan

wdcs-kishansudani

15 days ago

3.32ms

81.58kb

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

Retroz

Fungichi

16 days ago

3.23ms

81.58kb

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

Javier Romario

Javier-Romario

17 days ago

3.70ms

81.58kb

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

toto

18 days ago

3.35ms

81.58kb

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

FredoPo

18 days ago

3.28ms

81.58kb

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

Pristressia

19 days ago

3.44ms

81.58kb

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

Dharm Singh

dharmvr1

19 days ago

3.34ms

81.58kb

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

<YoungAncient/>

youngancient

20 days ago

3.21ms

81.58kb

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

Pavel Potapkin

potapkin-pavel

21 days ago

4.12ms

81.58kb

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

noname

random1106

21 days ago

3.61ms

81.58kb

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

Anton

majesty-dump

21 days ago

3.74ms

81.58kb

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

Neelotpal Santra

NSANTRA

25 days ago

3.42ms

81.58kb

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

shahab-tplus

25 days ago

3.12ms

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
}

Unseen

unseen2004

a month ago

4.24ms

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
}

Sebastien TADIELLO

stadiello

a month ago

3.21ms

81.58kb

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

Vincent SAMY

vsamy

a month ago

3.66ms

81.58kb

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

Ari Karim

arikarim

a month ago

3.46ms

81.58kb

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

Tim

timvyy

a month ago

4.00ms

81.58kb

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

Rubén Moreno aguado

rmaguado

a month ago

3.47ms

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
}

jh4vision

a month ago

6.39ms

81.58kb

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

ibrahimomar9316

a month ago

3.71ms

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
}

SubZ69

a month ago

3.91ms

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 % 2 == 0 {
            sum += i;
        }
    }
    sum
}

nojae15

a month ago

5.16ms

81.58kb

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

Christophe Mohimont

mohic

a month ago

4.37ms

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;
        }
    }
    sum
}

msned

2 months ago

4.03ms

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
}

Prakash Mardi

Mardiprk

2 months ago

3.15ms

81.58kb

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

Splatrac

splatrac

2 months ago

3.95ms

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
}

Omar

OmniKobra

2 months ago

3.64ms

81.58kb

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

Eugene Simonov

esimonov

2 months ago

3.62ms

81.58kb

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

TheJanzap

2 months ago

3.40ms

81.58kb

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

Abdul

aisiyoup

2 months ago

2.92ms

87.38kb

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

ghoti225

2 months ago

3.04ms

81.58kb

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

Tre1z

2 months ago

3.45ms

81.58kb

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

Lvfalue

2 months ago

3.54ms

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
}

Arpan Shingala

arpan-vs

2 months ago

3.37ms

81.58kb

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

amdfxlucas

2 months ago

3.19ms

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;
}