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Program to find sum of even numbers in given range

Program to find sum of even numbers in given range

Write a C program to input number from user and find sum of all even numbers between 1 to n. How to find sum of even numbers in a given range using loop in C programming. Logic to find sum of even numbers in a given range in C program.

    Input upper limit to find sum of even number. Store it in some variable say N.
    Initialize another variable to store sum with 0 say sum = 0.
    To find sum of even numbers we need to iterate through even numbers from 1 to n. Initialize a loop from 2 to N and increment 2 on each iteration. The loop structure should look like for(j=2; j<=N; j+=2).
    Inside the loop body add previous value of sum with j i.e. sum = sum + j.
    After loop print final value of sum.

#include <stdio.h>

int main()
{
    int j, start, end, sum=0;

    /* Input lower and upper limit from user */
    printf("Enter lower limit: ");
    scanf("%d", &start);
    printf("Enter upper limit: ");
    scanf("%d", &end);

    /* If start is not even then make it even */
    if(start%2!=0)
    {
        start++;
    }

    for(j=start; j<=end; j+=2)
    {
        /* Add current even number to sum */
        sum += j;
    }

    printf("Sum of all even number between %d to %d = %d", start, end, sum);

    return 0;
}

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