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C > For Loops and While Loops Code Examples

find sum of prime numbers in given range

find sum of prime numbers in given range

Write a C program to find sum of all prime numbers between 1 to n using for loop. C program to generate sum of all primes between a given range. Logic to find sum of prime numbers in a given range.

What is Prime number?

Prime numbers are positive integers greater than 1 that has only two divisors 1 and the number itself. For example: 2, 3, 5, 7, 11 are the first 5 prime numbers.

#include <stdio.h>

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

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

    /* Find all prime numbers in given range */
    for(x=start; x<=end; x++)
    {

        /* Check if the current number x is Prime or not */
        isPrime = 1;
        for(j=2; j<=x/2 ;j++)
        {
            if(x%j==0)
            {
                /* 'x' is not prime */
                isPrime = 0;
                break;
            }
        }

        /*
         * If x is Prime then add to sum
         */
        if(isPrime==1)
        {
            sum += x;
        }
    }

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

    return 0;
}

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