C Language - Sum of n natural numbers

Q1. WAP to find sum of n natural numbers.

#include<stdio.h>
#include<conio.h>
void main()
{
   int n, i, c=0;
   clrscr();
   printf("Enter number: ");
   scanf("%d",&n);
   for(i=1; i<=n; i++)
   {
       c=c+i;
   }
   printf("Sum of first %d number is: %d", n,c);
   getch();
}

Enter number: 5
Sum of first 5 number is: 15