Simple Calculator

[Ray]

Can anyone show me how to make a program do simple mathmatical proceedures? I had to write a program last week to make a simple calculator with enumerators and switch statements that allowed math problems like addition, subtraction, multiplication, division, and Modulus division. I wrote the program several times like the examples given but did not know how to remove the circle calculations and put in the mathmatical equations.

[Toxic90]

post the code here, so we can take a look at it, I think the best way is with a switch statement, but let me see ur code and I'll help you, since I have a calculator of my own.

[Scipio]

This is how i should do it:
-ask the user for input, eg:
First value? >> 4 (store into double)
Second value? >> 5 (store into double)
Action? >> + (store into string/char)
-compare the action with possible actions (+-*/) and perform this action with the two number, storing the answer in a double variable. You can use a switch for this.
-return the answer, and ask the user or he wants to perform another caculation (putt the whole code in a while-loop)

[Ray]

///*specification: Raymond Henry Sr Lab2 exercise 2
//My Calculator

#include "stdafx.h"
#include <iostream>
using namespace std;
using namespace myCalculator{



int main()

enum operation{Exit, Addition, Subtraction, Multiplication, Division, Modulus Division};

{

//ask for the user's numbers

double numbers = 0;
cout << endl << "Welcome to My Calculator:\n";
cout << endl << "Please Enter the first number followed by the second number followed by the operation you would like to accomplish: "
cout << endl << "Enter First number: ";
cin >> firstNum;
cout << endl << "Enter Second number: ";
cin >> secondNum;
cout << endl << endl;



// ask the user for desired operation
int operation = 0;
cout << "Choose an operation you would like to perform:\n\n";
cout << "1 - Addition\n";
cout << "2 - Subtraction\n";
cout << "3 - Multiplication\n";
cout << "4 - Division\n";
cout << "5 - Modulus Division\n";
cout << "0 - Exit\n";
cout << "Enter a Number: ";
cin >> Operation;

if(operation < 0 || operation > 5)
{ cout << endl <<"You did not select a valid operation, Program Ended:\n\n"; }

else

//find choice using switch statement
cout << "You Chose: ";
switch (
(HERE IS WHERE I GET LOST)

};
};
};
};
};

return 0;

}

[Ray]

The only thing this code does is asks me to pick a mathmatical operation. It does not do any sort of mathmatical process.

[Ray]

A class mate of mine told me to code the program like this but to exclude the circle processes and add the other math processes.

//specification: this program accepts a the radius of a circle and computes a the diameter
//circumference and Area and displays whichever value the user selects from a menu.
//This is a demonstration program to highlight the core concepts of this weeks lecture
#include <iostream>

using namespace std;

namespace circle{
const double PI = 3.1415;
enum menuOptions {Exit, Circum, Diameter, Area};
}

int main (){
//ask the user for a circle's radius
double userRadius = 0;
cout << endl << "Welcome to the Circle Calculator!\n";
cout << endl << "Enter a Radius: ";
cin >> userRadius;
cout << endl << endl;

//ask the user for his desired calculation
int usersChoice = 0;
cout << "Choose a Calculation Option:\n\n";
cout << "1 - Circumference\n";
cout << "2 - Diameter\n";
cout << "3 - Area\n";
cout << "0 - Exit\n";
cout << "Enter a number: ";
cin >> usersChoice;
if (usersChoice < 0 || usersChoice > 3){
cout << endl << "Invalid choice - program terminated\n\n";
}
else {
//perform calculations
struct circleType {double radius; double area; double diameter; double circum;};
circleType myCircle;
myCircle.radius = userRadius;
myCircle.diameter = myCircle.radius * 2; //radius * 2
myCircle.circum = myCircle.diameter * circle::PI; // 2 * radius * pi
myCircle.area = myCircle.radius * myCircle.radius * circle::PI ; // radius * radius * pi
switch (usersChoice) {
case circle::Exit:
cout << endl << "You choose to exit the program\n\n"; break;
case circle::Circum:
cout << endl
<< "A circle with a radius of "
<< myCircle.radius
<< " has a Circumference of "
<< myCircle.circum << "\n\n"; break;
case circle::Diameter:
cout << endl
<< "A circle with a radius of "
<< myCircle.radius
<< " has a diameter of "
<< myCircle.diameter << "\n\n"; break;
case circle::Area:
cout << endl
<< "A circle with a radius of "
<< myCircle.radius
<< " has an area of "
<< myCircle.area
<< "\n\n"; break;
default:
cout << endl << "Not a valid choose!\n\n";
}

cout << endl << endl << "end of program\n\n";
}

return 0;

}

[Ray]

The place where I get lost is when it asks me to perform calculations I did not know how to change this to make it do the mathmatical calculations I needed. if you motice in my code I have the top portion right I think.