Calculator Using Pointers & Parameter pass by Refrence.

#include<iostream.h>

void add(float* , float*);        // function declaration
void sub(float* , float*);        // function declaration
void mul(float* , float*);        // function declaration
void div(float* , float*);        // function declaration

int main(){
    char option;
    float a;
    float b;     
   
    cout << "Choose from the following options: " << endl;
    cout << "+ : Plus" << endl;
    cout << "- : Minus" << endl;
    cout << "* : Multiply" << endl;
    cout << "/ : Divide" << endl;
    cin >> option;
   
    cout << "Enter first number: ";  cin >> a;
    cout << "Enter second number: "; cin >> b;
   
    switch (option){
      case '+':
         add(&a, &b);
         break;
     
      case '-':
         sub(&a, &b);
         break;
     
      case '*':
         mul(&a, &b);
         break;
     
      case '/':
         div(&a, &b);
         break;
     
      default:
         cout << "Wrong option. Run again.";
    } // end switch
   
return 0;
} // end main()

// ========= () ================
void add(float* x, float* y){
   cout << *x << " + " << *y << " = " << ((*x) + (*y));
return;
} 

// ========= () ================
void sub(float* x , float* y) {
   cout << *x << " - " << *y << " = " << ((*x) - (*y));
return;   
}

// ========= () ================
void mul(float* x, float* y){
   cout << *x << " * " << *y << " = " << ((*x) * (*y));
return;
} 

// ========= () ================
void div(float* x, float* y){
   cout << *x << " / " << *y << " = " << ((*x) / (*y));
return;
}