Code:
/*
TheEliteOne's C++ Calculator Example
Every thing that I could explain is explained
Try changing some things, removing things, ect. to learn more.
*/
#include <iostream> //Includes the iostream file from your library into your program when you compile it
#include <cmath> //Includes the cmath file from your library into your program when you compile it
using namespace std;
char type; //Allows us to use the variable type
int number1, number2, number3; //Allows us to use the variables type, number1, number2, and number3 in are program
int main() //Says that we are entering the main function of are program
{ //This is the start of are main function
First: //This will be used for goto command later
system("cls"); //This clears the screen, so if we goto first the screen will clear
cout<<"TheEliteOne's Calculator Example\n\n"; //Displays the words TheEliteOne's Calculator Example, the \n is like pressing enter
cout<<"Enter the number for the operation you want to peform:\n\n"; //Displays text
cout<<"1) Addition\n2) Subtraction\n3) Multiplication\n4) Divition\n\n";
cin>>type; //This makes it so what ever you typed in is stored in the vareable type
if(type=='1') //If the user typed 1 they will go through the following until the }
{ //Starts what will happen when you type in 1
Add: //This will be used for a goto command
system("cls"); //Clears the screen
cout<<"Enter the first number:\n\n"; //Displays text
cin>>number1; //This makes it so what ever you typed in is stored in the vareable number1
cout<<"\nEnter the second number:\n\n"; //Displays text
cin>>number2; //This makes it so what ever you typed in is stored in the vareable number2
number3=number1+number2; //Adds number1 and number2 and stores the result into number3
system("cls"); //Clears the screen
cout<<"Result:\n\n" <<number3<< "\n\n"; //Displays the result
cout<<"Try again? (y/n)\n\n"; //Displays text
cin>>type; //This makes it so what ever you typed in is stored into the vareable type
if(type=='Y') //If the user typed Y they will continue on, C++ is case sinsitive, so I added this check to make sure it works with a Y
{ //Starts what will happen when you type in Y
goto Add; //If the user typed in Y they would go back to Add
} //Ends what would happen if the user typed in Y, so if they didn't type Y they would go to here
if(type=='y') //Here is the same thing for y
{ //Starts what would happen when you type in y
goto Add; //Goto add
} //Ends
if(type=='N') //Now here is if the user typed in N
{ //Start
goto First; //So if the user typed in N we would goto First
} //Ends
if(type=='n') //One for n
{ //Start
goto First; //Goto First
} //Ends
} //Ends of what heppends if you press 1 in the main menu
if(type=='2') //If the user typed in 2 in the main menu they would go through the following untell the }
{ //Start
Sub: //This will be used for a goto command
system("cls"); //Clears the screen
cout<<"Enter the first number:\n\n"; //Displays text
cin>>number1; //This makes it so what ever you typed in is stored in the vareable number1
cout<<"\nEnter the second number:\n\n"; //Displays text
cin>>number2; //This makes it so what ever you typed in is stored in the vareable number2
number3=number1-number2; //Subtracts number1 and number2 and stores the result into number3
system("cls"); //Clears the screen
cout<<"Result:\n\n" <<number3<< "\n\n"; //Displays the result
cout<<"Try again? (y/n)\n\n"; //Displays text
cin>>type; //This makes it so what ever you typed in is stored into the vareable type
if(type=='Y') //If the user typed Y they will continue on, C++ is case sinsitive, so I added this check to make sure it works with a Y
{ //Starts what will happen when you type in Y
goto Sub; //If the user typed in Y they would go back to Sub
} //Ends what would happen if the user typed in Y, so if they didn't type Y they would go to here
if(type=='y') //Here is the same thing for y
{ //Starts what would happen when you type in y
goto Sub; //Goto Sub
} //Ends
if(type=='N') //Now here is if the user typed in N
{ //Start
goto First; //So if the user typed in N we would goto First
} //Ends
if(type=='n') //One for n
{ //Start
goto First; //Goto First
} //Ends
} //Ends of what heppends if you press 2 in the main menu
if(type=='3') //If the user typed 3 in the main menu they will go through the following until the }
{ //Start
Mult: //This will be used for a goto command
system("cls"); //Clears the screen
cout<<"Enter the first number:\n\n"; //Displays text
cin>>number1; //This makes it so what ever you typed in is stored in the vareable number1
cout<<"\nEnter the second number:\n\n"; //Displays text
cin>>number2; //This makes it so what ever you typed in is stored in the vareable number2
number3=number1*number2; //Multiplies number1 and number2 and stores the result into number3
system("cls"); //Clears the screen
cout<<"Result:\n\n" <<number3<< "\n\n"; //Displays the result
cout<<"Try again? (y/n)\n\n"; //Displays text
cin>>type; //This makes it so what ever you typed in is stored into the vareable type
if(type=='Y') //If the user typed Y they will continue on, C++ is case sinsitive, so I added this check to make sure it works with a Y
{ //Starts what will happen when you type in Y
goto Mult; //If the user typed in Y they would go back to Mult
} //Ends what would happen if the user typed in Y, so if they didn't type Y they would go to here
if(type=='y') //Here is the same thing for y
{ //Starts what would happen when you type in y
goto Mult; //Goto Mult
} //Ends
if(type=='N') //Now here is if the user typed in N
{ //Start
goto First; //So if the user typed in N we would goto First
} //Ends
if(type=='n') //One for n
{ //Start
goto First; //Goto First
} //Ends
} //Ends what happens if you press 3 in the main menu
if(type=='4') //If the user typed 4 in the main menu they will go through the following until the }
{ //Start
Div: //This will be used for a goto command
system("cls"); //Clears the screen
cout<<"Enter the first number:\n\n"; //Displays text
cin>>number1; //This makes it so what ever you typed in is stored in the vareable number1
cout<<"\nEnter the second number:\n\n"; //Displays text
cin>>number2; //This makes it so what ever you typed in is stored in the vareable number2
number3=number1/number2; //Divides number1 and number2 and stores the result into number3
system("cls"); //Clears the screen
cout<<"Result:\n\n" <<number3<< "\n\n"; //Displays the result
cout<<"Try again? (y/n)\n\n"; //Displays text
cin>>type; //This makes it so what ever you typed in is stored into the vareable type
if(type=='Y') //If the user typed Y they will continue on, C++ is case sinsitive, so I added this check to make sure it works with a Y
{ //Starts what will happen when you type in Y
goto Div; //If the user typed in Y they would go back to Div
} //Ends what would happen if the user typed in Y, so if they didn't type Y they would go to here
if(type=='y') //Here is the same thing for y
{ //Starts what would happen when you type in y
goto Div; //Goto Div
} //Ends
if(type=='N') //Now here is if the user typed in N
{ //Start
goto First; //So if the user typed in N we would goto First
} //Ends
if(type=='n') //One for n
{ //Start
goto First; //Goto First
} //Ends
} //Ends what happens if you press 3 in the main menu
else //So if the user types in some thing in the main menu that we don't wont we will go through this
{ //Start
goto First; //So if you type in a number that we don't want nothing happens
} //Ends
} //Ends main, and are program
//Try changing some things, removing things, ect. to learn more.
Here are two links to the program that this source code would make:
-LeetGamer- 
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