This program illustrates the more practical example of application of C-loops discussed in previous lession. This program calculates the sum of first n natural numbers. Complete source code and output of program is given here.. Source Code
1: // summation of first n natural numbers
2: #include<stdio.h>
3:
4: int main(){
5: int i, sum = 0; //for storing sum, initially must be zero
6: int n;
7: printf("Enter the number: ");
8: scanf("%d",&n);
9:
10: for(i = 0; i <=n; i++){
11: sum = sum + i;
12: }
13:
14: printf("The sum of first %d natural number is %d\n\n", n,sum);
15: return 0;
16: }