C program to print sum of n nontail number

C program to print sum of n non-tail number.


 #include <stdio.h>
#include <stdlib.h>
int sum_natural_no(int num); // declare function outside the main function
int main()
{
    int num, sum = 0; // declare local variable
    printf("Enter any positive number to calculate the sum of natural no. ");
    scanf("%d", &num); // take an input from the user

    sum = sum_natural_no(num); // call the function

    printf("Sum of the first %d natural number is: %d", num, sum); // print the sum of natural number
    return 0;
}
int sum_natural_no(int num)
{
    if (num == 0) // define if condition
    {
        return num;
    }
    else
    { // return the else condition
        return (num + sum_natural_no(num - 1));
    }
    getch();
    

} 

OUTPUT: