Question

Write a C program that creates a security access code from a social security number entered by a user as follows: Using a recursive function it adds all of the digits of the social security number and then using a regular function gets the square number of the sum and displays it. The access code displayed should be initialized as an integer number but using type casting is displayed as a floating number.

Answer 1

#include<stdio.h>
#include<math.h>
int add(int n)  //recursive function to calculate sum of digits of number
{
    if(n==0) return 0;  //base condtion
    return n%10+add(n/10);  //adding digits
}
int Square(int n)
{
    return n*n;  //return square of number
}
int main()
{
    int ssn,sac;
    printf("Enter Social Security Number : ");
    scanf("%d",&ssn);    //ask user to input SSN
    int x=add(ssn);     //finding sum of digits
    sac=Square(x);       //finding square of a number
    printf("Security Access Code is : %f\n\n",(float)sac);  //print float of SAC by using type cast

}

Sample Input/Output Screenshot: