adding all the numbers from 1 to n c code example

Example 1: add 2 numbers in c

#include<stdio.h>
int main() {
int a, b, sum;
printf("\nEnter two no: ");
scanf("%d %d", &a, &b);
sum = a + b;
printf("Sum : %d", sum);
return(0);

Example 2: sum of n natural numbers in c

int addNumbers(int n)
{
    int count, sum = 0;

    for(count=1; count <= n; count++)
    {
        sum = sum + count;
    }
  
    return sum;
}