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

Jim Lawton

jimlawton

5 hours ago

2.94ms

81.58kb

pub fn sum_of_evens(start: i32, end: i32) -> i32 {
    // Your code here...
    if start > end {
        return 0;
    } else {
        let range = std::ops::Range { start, end: end + 1 };
        range.filter(|a| if a % 2 == 0 {true} else {false}).sum()
    }
}

woke-developer

13 hours ago

3.31ms

81.58kb

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

Markus Bergkvist

mbergkvist

13 hours ago

3.18ms

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
}

5822791760

14 hours ago

3.13ms

87.38kb

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 + 1 {
        if n % 2 == 0 {
            sum += n;
        };
    };
    println!("{}", start);
    println!("{}", end);
    println!("{}", sum);
    return sum;
}

leenalmajz

14 hours ago

3.05ms

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
    } else {
        for i in start..end+1 {
            if is_even(i) {
                sum += i
            }
        }
        return sum
    }  
}
pub fn is_even(n: i32) -> bool {
    if n % 2 == 0 {
        return true
    } else {
        return false
    }
}

facat

16 hours ago

3.02ms

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 v in start..(end+1){
        if v%2==0{
            sum+=v;
        }
    }
    return sum;
}

DistributedDoge

17 hours ago

2.98ms

81.58kb

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

Jaden Wijata

xenonminer

20 hours ago

3.26ms

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; }
    }
    return sum;
}

Esteban Soba

XtebanUy

a day ago

3.15ms

81.58kb

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

mehdihmr

a day ago

3.81ms

81.58kb

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

Ethel Arterberry

ethel-dev

2 days ago

4.00ms

81.58kb

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
}

Ando “Thor” Nando

DivineGod

2 days ago

3.88ms

81.58kb

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

Algorab

2 days ago

3.13ms

81.58kb

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

Johannes Pfabe

Hannnsen

2 days ago

4.00ms

81.58kb

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 = sum + i;
        }
    }
    sum
}

Stefan Roas

sroas

2 days ago

4.01ms

81.58kb

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

Itay

itaygenkin

2 days ago

3.45ms

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;
        }
    }
    return sum;
}

Felipe Balbi

felipebalbi

2 days ago

3.32ms

81.58kb

pub fn sum_of_evens(start: i32, end: i32) -> i32 {
    // Your code here...
    (start..=end).filter(|n| n & 1 == 0).sum()
}

Daniel Petrov

danielmpetrov

2 days ago

3.37ms

81.58kb

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

yoakemae

3 days ago

3.76ms

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;
        }
    }
    return sum;
}

qiyuan711

3 days ago

6.19ms

81.58kb

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

Jan Willems

3 days ago

3.10ms

81.58kb

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

Nicky Thorne

nickythorne

3 days ago

3.24ms

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()
}

chuyuanlinzi

4 days ago

3.52ms

81.58kb

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

Philip Mercer

DV-13

4 days ago

3.15ms

81.58kb

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

Ushakov Andrey

stdstring

4 days ago

3.38ms

81.58kb

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

tinthid

4 days ago

3.44ms

81.58kb

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

martin-unit

4 days ago

5.80ms

81.58kb

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

RonaldoArayadev

4 days ago

3.31ms

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 n in start..=end {
        if n % 2 == 0 {
            sum += n;
        }
    }
    sum
}

Hudson

dalprahcd

4 days ago

4.25ms

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
}

Reda Bouaida

3ok

4 days ago

3.55ms

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;
            }
        }
        return sum
    }
}

Elizabeth Doughty

Thymelizabeth

4 days ago

3.15ms

81.58kb

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

Elizabeth Doughty

Thymelizabeth

4 days ago

3.14ms

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
}

devarajang

5 days ago

3.38ms

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 = sum + i;
        }
    }
    return sum;
}

Jan

jeypiti

6 days ago

3.17ms

81.58kb

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

s.konishi

konishu

6 days ago

4.64ms

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 temp in start..=end {
            if temp % 2 == 0 {
                sum_ += temp
            }
        }
        return sum_
    }
}

oDqnger

6 days ago

5.20ms

81.58kb

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

nichideropa

6 days ago

3.86ms

81.58kb

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

aleksey-vareto

6 days ago

3.69ms

86.53kb

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

aleksey-vareto

6 days ago

4.26ms

81.58kb

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

akshayabhattarai

6 days ago

4.47ms

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 a in start..=end {
        if a%2 == 0{
            sum +=a;
        }
    }
    sum
}

0xsmarter

6 days ago

4.01ms

81.58kb

pub fn sum_of_evens(start: i32, end: i32) -> i32 {
    // Your code here...
   let mut sum = 0; // we first define the sum here 
   for x in start..=end { // we start the loop from start to end 
       if x % 2 == 0 {
          sum += x;
       }
   }
   sum // we are the total sum here 
}

madeinheaven91

6 days ago

3.00ms

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
}

aidan1magee

7 days ago

3.95ms

81.58kb

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

Ankeet Parikh

ankeetparikh

7 days ago

3.78ms

81.58kb

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

maxvi

7 days ago

3.10ms

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
}

Hacker Major Sreekumar

hackermajorsreekumar

7 days ago

4.12ms

81.58kb

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

koslowskio

8 days ago

3.73ms

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 = sum + n;
        }
    }
    return sum
}

Rafael Lucas

rafaellucasprogm

8 days ago

3.40ms

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
}

Rafael Lucas

rafaellucasprogm

8 days ago

3.08ms

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
}

Rocky.C

cloki0610

8 days ago

3.58ms

81.58kb

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