// These are called headers. These things are wrote to provide the many different functions available to // you such as std::cout, std::endl, std::string, and many other different ones. You can probably go to // google and find the different commands written for you in these libraries if you'd like, but these are // the only required ones to make this very simple calculator. #include <iostream> #include <string>
using namespace std;
int main() { // Doubles will make an integer value, but increase the number of bytes available. This will allow // the client to use bigger numbers, if they wish of course. These also can become decimals when there // is a remainder. double number1; double number2; double total;
// Integers are values that are either negative or positive. You can use signed or unsigned before // declaring the integer to state if they are allowed to be a negative number or not, but we won't // get into that right now. int current_operation; int keep_running;
// Booleans are very simple. True or False? We will create this one boolean for the simple sake of // teaching loops and the such, and just to make our program exitable in general. bool programRunning = true;
// If you do not declare if you are checking if the statement is true or false, and you are not using // the negation operator, then it will automatically assume the following statement is true. Below is // an example of what this comment actually means... // // while(programRunning) returns true // while(programRunning == true) returns true // while(programRunning != false) returns true // // while(!programRunning) returns false // while(programRunning == false) returns false // while(programRunning != true) returns false // // Hopefully this clarified what I was trying to say :-). while(programRunning) { cout << "Welcome to my very first program!" << endl; cout << "First, we need to declare two variables and preform an mathematical operation to determine what the total is!" << endl; cout << endl; cout << "First value: "; cin >> number1; // NOTE: When using cin >> to recieve input, it will automatically create a new line for you. cout << "Second value: "; cin >> number2; cout << endl; cout << "Great! Now all we have to do is declare which mathematical operation you would like to use!" << endl; cout << endl; cout << "Type 1 if you would like to add the two numbers." << endl; cout << "Type 2 if you would like to subtract the two numbers." << endl; cout << "Type 3 if you would like to multiply the two numbers." << endl; cout << "Type 4 if you would like to divide the two numbers." << endl; cout << endl; cout << "Input: ";
cin >> current_operation;
cout << endl; // NOTE: This is used to make it look all pretty! Don't think it's random :-P.
if(current_operation == 1) { total = number1 + number2;
cout << "Your total is " << total << "!" << endl; cout << endl; cout << "Type 1 if you would like to find another answer." << endl; cout << "Type 2 to exit the program." << endl; cout << endl; cout << "Input: ";
if(current_operation == 2) { total = number1 - number2;
cout << "Your total is " << total << "!" << endl; cout << endl; cout << "Type 1 if you would like to find another answer." << endl; cout << "Type 2 to exit the program." << endl; cout << endl; cout << "Input: ";
if(current_operation == 3) { total = number1 * number2;
cout << "Your total is " << total << "!" << endl; cout << endl; cout << "Type 1 if you would like to find another answer." << endl; cout << "Type 2 to exit the program." << endl; cout << endl; cout << "Input: ";
if(current_operation == 4) { total = number1 / number2;
cout << "Your total is " << total << "!" << endl; cout << endl; cout << "Type 1 if you would like to find another answer." << endl; cout << "Type 2 to exit the program." << endl; cout << endl; cout << "Input: ";
// This is the very end of the program. If the program did what it was supposed to do, and checked // to see if everything exited okay, and there were no errors, then it will return the value of 1. return 1; }
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