Question

CE – Return and Overload in C++

You are going to create a rudimentary calculator.

1. The program should call a function to display a menu of three options:
   1. 1 – Integer Math
   2. 2 – Double Math
   3. 3 – Exit Program

2. The program must test that the user enters in a valid menu option. If they do not, the program must display an error message and allow the user to reenter the selection. Once valid, the function must return the option selected.

3. If the user selects 1 or 2, the program should allow the user to enter in any two numbers.
   1. The program must create 5 functions called add, subtract, multiply, divide and mod. These functions must take two integers as arguments and return an integer to the calling function. Each function performs the appropriate mathematical task.
   2. The program must create 4 functions called add, subtract, multiply and divide. These functions must take two doubles as arguments and return a double to the calling function. Each function performs the appropriate mathematical task.
   3. The program must create two functions called display.
      1. The first display function takes the five integer values calculated and displays them
      2. The second display function takes the four double values calculated and display them to two decimal places

4. If the user select 3, the program should call a function to ask the user if they want to exit the program. The only valid responses are Y, y, N and n. The program must test that the user enters in a valid response. If they do not, the program must display an error message and allow the user to reenter the selection. Once valid, the function must return a Boolean back to the calling function telling the calling function to allow for a new entry to to end the program.

5. The program should only end if the user selects 3 from the menu and y or Y that they want to end. There is no other way to end the program.

6. Print some goodbye message.

7. Notes:
   1. The program must declare all of the functions using prototypes.
   2. All functions except the display functions must return a value. The main program should always contain a variable to catch that return value.

Answer 1

Note: Could you plz go through this code and let me know if u need any changes in this.Thank You
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#include <iostream>

#include <string>

using namespace std;

// Function Declarations
int getValidMenuOption();
char getvalidExitOption();
int add(int a, int b);
int sub(int a, int b);
int divide(int a, int b);
int multiply(int a, int b);
int modulas(int a, int b);
void display(int ares, int sres, int mres, int dres, int modre);
double add(double n1, double n2);
double sub(double n1, double n2);
double divide(double n1, double n2);
double multiply(double n1, double n2);
void display(double ares, double sres, double mres, double dre);
int main() {
//Declaring variables
int choice, a, b;
double n1, n2;
char exitop;
  
/* This while loop continues to execute
* until the user enters a valid input
*/
while (true) {
   //displaying the menu
cout << "\n1 - Integer Math" << endl;
cout << "2 - Double Math" << endl;
cout << "3 - Exit" << endl;
cout << "Enter Choice :";
  
//getting the choice entered by the user
choice = getValidMenuOption();
  
//Based on the user choice the corresponding case will be executed
switch (choice) {
case 1:
{
cout << "Enter two numbers ( seperated by space ):";
cin >> a >> b;
int ares = add(a, b);
int sres = sub(a, b);
int dres = divide(a, b);
int mres = multiply(a, b);
int modres = modulas(a, b);
display(ares, sres, mres, dres, modres);
continue;
}
case 2:
{
cout << "Enter two numbers ( seperated by space ):";
cin >> n1 >> n2;
double ares = add(n1, n2);
double sres = sub(n1, n2);
double dres = divide(n1, n2);
double mres = multiply(n1, n2);
display(ares, sres, mres, dres);
continue;
}
case 3:
{
exitop = getvalidExitOption();
if (exitop == 'y' || exitop == 'Y') {
break;
} else {
continue;
}

}

}
break;
}

return 0;
}
int getValidMenuOption() {
int choice;
while (true) {
cin >> choice;
if (choice < 1 || choice > 3) {
cout << "** Invalid.Must be between 1 and 3 **" << endl;
} else {
break;
}
}
return choice;

}
char getvalidExitOption() {
char ch;
while (true) {
cout << "Do you want to exit the program (Y or y/N or n):";
cin >> ch;
if (ch != 'y' && ch != 'Y' && ch != 'n' && ch != 'N') {
cout << "Invalid.Must be either 'Y' or 'y' / 'N' or 'n'" << endl;
} else {
break;
}
}

return ch;
}
int add(int a, int b) {
return a + b;
}
int sub(int a, int b) {
return a - b;
}
int divide(int a, int b) {
return a / b;
}
int multiply(int a, int b) {
return a * b;
}
int modulas(int a, int b) {
return a % b;
}
void display(int ares, int sres, int mres, int dres, int modres) {
cout << "Addition :" << ares << endl;
cout << "Subtraction :" << sres << endl;
cout << "Multiplication :" << mres << endl;
cout << "Division :" << dres << endl;
cout << "Modulas :" << modres << endl;
}
double add(double n1, double n2) {
return n1 + n2;
}
double sub(double n1, double n2) {
return n1 - n2;
}
double divide(double n1, double n2) {
return n1 / n2;
}
double multiply(double n1, double n2) {
return n1 * n2;
}
void display(double ares, double sres, double mres, double dres) {
cout << "Addition :" << ares << endl;
cout << "Subtraction :" << sres << endl;
cout << "Multiplication :" << mres << endl;
cout << "Division :" << dres << endl;
}

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Output:

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