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C program to find sum of all numbers from 0 to N without using loop

Here, we are implementing a C program that will be used to find the sum of all numbers from 0 to N without using loop.
Submitted by IncludeHelp, on September 04, 2018

Given the value of N and we have to find sum of all numbers from 0 to N in C language.

To find the sum of numbers from 0 to N, we use a mathematical formula: N(N+1)/2

Example:

    Input:
    Enter value of N: 5
    Logic/formula:
    sum = N*(N+1)/2 = 5*(5+1)/2 =5*6/2 = 15
    Output:
    sum = 15


    Input:
    Enter value of N: 10
    Logic/formula:
    sum = N*(N+1)/2 = 10*(10+1)/2 =10*11/2 = 110/2 = 55
    Output:
    sum = 55

Program:

#include <stdio.h>

int main(void) {
	
	int n, sum;
	
	//input value of n
	printf("Enter the value of n: ");
	scanf("%d", &n);
	
	//initialize sum with 0
	sum =0;
	
	//use formula to get the sum from 0 to n
	sum = n*(n+1)/2;
	
	//print sum 
	printf("sum = %d\n", sum);
	
	return 0;
}

Output

    Run1:
    Enter the value of n: 5
    sum = 15

    Run2:
    Enter the value of n: 10
    sum = 55

C Basic Programs »



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