Write a C Program

Question

Write a C program that calculate the sum of first n natural numbers and sum of first n negative number. You need to get n value form user. Make a proper display for choice.

Hint:

1. Array

2. Decision Statement

Answer 1

#include <stdio.h>

int main()

{

int N;

printf(" Please input the value of N :>");

scanf("%d",&N);

long n = N*(N+1)/2;

printf("The sum of the first N (positive or negative)integers is +or- %ld \n",n);

}