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C program to calculate sum of first N natural numbers.

Problem statement

This program will read the value of N and calculate sum from 1 to N, first N natural numbers means numbers from 1 to N and N will be read through user.

C program to calculate sum of first N natural numbers

/*C program to calculate sum of first N natural numbers.*/ #include <stdio.h> int main() { int n, i; int sum; printf("Enter the value of N: "); scanf("%d", &n); sum = 0; for (i = 1; i <= n; i++) sum += i; printf("Sum is: %d\n", sum); return 0; }

Output

RUN 1:
Enter the value of N: 100
Sum is: 5050

RUN 2:
Enter the value of N: 10
Sum is: 55

RUn 3:
Enter the value of N: 3
Sum is: 6

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