C program to display sum of first n natural numbers using for loop 

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 C program to display sum of first n natural numbers

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 #include<stdio.h>

 void main()

 {

     int i,num,sum=0;

     printf("** OUTPUT**\n");

     printf("How many natural number you wants to display\n");

     scanf("%d",&num);

     printf("First N natural numbers are\n");

     for(i=0;i<=num;i++)

     {

         printf("%d\n",i);

         sum=sum+i;

     }

     printf("The sum of first N natural numbers is: %d\n",sum);

     printf("End of program");

 }

** OUTPUT**

How many natural number you wants to display

12

First N natural numbers are

0

1

2

3

4

5

6

7

8

9

10

11

12

The sum of first N natural numbers is: 78

End of program