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

zelsazgh

an hour ago

2.43ms

81.58kb

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

VladyslavY

4 hours ago

2.48ms

87.39kb

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

Delta Regeer

digitalresistor

8 hours ago

2.41ms

81.58kb

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

José Bernardo

jose-bernardo

11 hours ago

2.33ms

81.58kb

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

José Bernardo

jose-bernardo

11 hours ago

2.46ms

81.58kb

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

Maki-SIO

12 hours ago

2.35ms

81.58kb

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

featurealchemist

crrodger

12 hours ago

2.44ms

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;
        }
    }
    return sum
}

Logan Radloff

radloffl

13 hours ago

2.60ms

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 {
        let remainder = i % 2;
        if remainder == 0 {
            sum = sum + i;
        }
    }
    return sum;
}

mephit

just-mephit

14 hours ago

2.39ms

81.58kb

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

Carlos Arias

carlos-quantexai

14 hours ago

2.68ms

87.38kb

pub fn sum_of_evens(start: i32, end: i32) -> i32 {
    // Your code here...
    let mut result = vec![];
    for i in start..=end{
        if i % 2 == 0{
            result.push(i)
        }
    }
    result.iter().sum()
}

oTTeuM

oTTeuMsTudio

15 hours ago

2.30ms

81.58kb

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

Alex

dslex35

18 hours ago

2.41ms

81.58kb

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

Infamous-711

infamous-711

a day ago

2.38ms

81.58kb

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

Thatphum

ThatphumCpre

a day ago

2.31ms

81.58kb

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

今何求

jhq223

a day ago

2.35ms

81.58kb

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

Francisco

francisco-cmyk

a day ago

2.38ms

81.58kb

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

Will Barnett

xbarnett

a day ago

2.22ms

81.58kb

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

Mikhail

mk-comm

a day ago

2.42ms

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 = sum + n;
        }
    };
    sum
}

Adam Baker

nordicmachine

2 days ago

2.72ms

81.58kb

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

Moses

MosesMp3

2 days ago

2.42ms

81.58kb

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

majesticalcreature

2 days ago

2.57ms

86.53kb

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+1 {
        if i % 2 == 0 {
            sum += i;
        }
    }
    sum
}

Joe Schneider

josschne

2 days ago

2.22ms

81.58kb

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

sander-b-postnl

2 days ago

2.41ms

81.58kb

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

Matei Stefanescu

matei

2 days ago

2.44ms

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+1 {
        if i % 2 == 0 {
            sum += i;
        }
    }
    return sum;
}

st01011

2 days ago

2.22ms

81.58kb

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

Hendrik De Vloed

hendrikdevloed

2 days ago

2.49ms

81.58kb

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

komarspn

2 days ago

2.46ms

81.58kb

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

amassare

2 days ago

2.38ms

81.58kb

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

Edoardo A. Morosanu

edoardo-morosanu

2 days ago

2.77ms

81.58kb

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

Zava

zavakid

2 days ago

2.56ms

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()
}

IdoPort

2 days ago

2.51ms

81.58kb

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

viktr

victorchukwuemeka

2 days ago

2.40ms

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
    
}

Johnchoi913

2 days ago

2.35ms

81.58kb

pub fn sum_of_evens(start: i32, end: i32) -> i32 {
    // Your code here...
    //O(1) solution
    if start >= end {
        return 0;
    }
    
    let even_start = {
        if start % 2 == 0 {
            start / 2
        } else {
            (start + 1) / 2
        }
    };
    let even_end = {
        if end % 2 == 0 {
            end / 2
        } else {
            (end - 1) / 2
        }
    };
    
    if start == end {
        return start;
    }
    if (even_start >= 0 && even_end >= 0){
        return (even_end - even_start + 1) * (even_start + even_end );
    } else{
        return (even_end + even_start + 1) * (even_start + even_end ) * -1;
    }
}

M.Sorawid

qapd01

2 days ago

2.39ms

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 n % 2 == 0 {
            sum += n
        }
    }
    sum
}

Jijo Bose

JijoBose

2 days ago

2.32ms

81.58kb

pub fn sum_of_evens(start: i32, end: i32) -> i32 {
    if start > end {
        return 0;
    }
    (start..end+1).into_iter().filter(|i| i % 2 == 0).sum()
}

Parallaxes

2 days ago

2.54ms

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
}

Matthew Davidson

Rational1ty

2 days ago

2.37ms

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 { continue; }
        sum += n;
    }
    return sum;
}

Elliott Smith

brum-b0

2 days ago

2.39ms

87.76kb

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

Tiago Silva

tiagombsilva

2 days ago

2.31ms

87.39kb

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

i5.650

i5-650

2 days ago

2.37ms

81.58kb

pub fn sum_of_evens(start: i32, end: i32) -> i32 {
    if start > end {
        return 0;
    }
    (start..end+1).into_iter().filter(|i| i % 2 == 0).sum()
}

retinotopic

2 days ago

2.41ms

81.58kb

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

Ustin

2 days ago

2.33ms

81.58kb

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

ogaca42

3 days ago

2.45ms

81.58kb

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

Jonathan Lopez

otherJL0

3 days ago

2.69ms

81.58kb

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

Patrik Bjärterot

pbjarterot

3 days ago

2.43ms

81.58kb

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

Stefano Cianciulli

CianciuStyles

3 days ago

2.55ms

81.58kb

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

Ayush Rawat

ayushrawat10

3 days ago

2.44ms

81.58kb

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

Egor Konovalov

agegorin

3 days ago

2.38ms

81.58kb

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

damascussteel21

3 days ago

2.40ms

81.58kb

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

Egor Konovalov

agegorin

3 days ago

2.41ms

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
}