Sum of N numbers

C Program to Calculate the Sum of Natural Numbers

Source Code :

#include<stdio.h> int main()  {    int a,sum=0,i=0;    printf("Enter number:");       scanf("%d",&a);    while(i<=a)    {      sum=sum+i;      i++;    }    printf("%d",sum);    return 0; }

Output:

Enter number:10                                                                                                       

55