Write a program to input an integer num from the keyboard and: : find the area of a square whose side length is num. : find the volume of a sphere whose radius is num. : find the length of the side of a square whose area is num.

# include<iostream>  

# include<math.h>  

using namespace::std;  

void calc (int num)  

{

     cout<<"Area of Square" <<num*num;   

     cout<<"Volume of a sphere" << (4/3) *3.14*num*num*num;

     cout<<"Side of a Square" <<sqrt(num);  

     }  

int main ()  

{  

     int num;

     cout<<"Enter the Number"; cin>>num;  

      calc(num);  

      return 0;  

}  

Explanation:

I have used the swtich for the selection purpose. Also, I have used sqrt() function, and for that I have included math,h library.  And the various formula comes from mensuration. Rest part is self explanatory.

b. xor is the correct answer