C program to print sum of n-tail number.

 

C program to print sum of n-tail number.

#include 
int sum_natural_no(int num, int sum); 
int main()
{
    int num, sum = 0; 
    printf("Enter value of num. ");
    scanf("%d", &num);

    sum = sum_natural_no(num, sum); 

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

} 

OUTPUT: