# C Program to calculate sum of First N Natural numbers

Get input n and calculate the sum of first n natural numbers.

Sample Input 1:

5

Sample Output 1:

15(1+2+3+4+5)

#### Program or Solution

` ````
#include<stdio.h>
int main()
{
int n,i,sum=0;
printf("Enter a number:");
scanf("%d",&n);
for(i=1;i<=n;i++)
{
sum=sum+i;
}
printf("The sum of natural numbers till %d is : %d",n,sum);
return 0;
}
```

#### Program Explanation

Instruction(s) inside the for block{} are executed repeatedly till the second expression (i