Question

Write a C++ program which consists of several functions besides the main() function.

1)   The main() function, which shall ask for input from the user (ProcessCommand() does this) to compute the following: SumProductDifference and Power. There should be a well designed user interface.
2)   A void function called SumProductDifference(int, int, int&, int&, int&), that computes the sum, product, and difference of it two input arguments, and passes the sum, product, and difference by-reference.
3)   A value-returning function called Power(int a, int b) that computes a raised to the b power. Design and implement your own power function using an iterative control structure, or even recursion. Do not simply write a wrapper around the C++ function called pow().
4)   There should be a user loop and a menu so that the user can select either SumProductDifference, Power, or Quit. Then ProcessCommand() should ask the user for two values to compute SumProductDifference or Power. ProcessCommand() should then also output the answer.

Answer 1

#include <iostream>
using namespace std;
void SumProductDifference(int x,int y,int &sum,int &product,int &diff)
{
sum=x+y;
product=x*y;
diff=x-y;
}
int power(int a,int b)
{
int r=1;
for(int i=1;i<=b;i++)
r=r*a;
  
return r;
}
void ProcessCommand(int &x,int &y)
{
cout<<"Enter two numbers :";
cin>>x>>y;
}
int main()
{
int x,y,sum,product,diff;
ProcessCommand(x,y);
SumProductDifference(x,y,sum,product,diff);
cout<<"Sum = "<<sum<<"\nProduct= "<<product<<"\nDifference ="<<diff;
cout<<"\nPower of "<<x<<"to "<<y<<" is :"<<power(x,y);

return 0;
}