Easy Calculator with functions like Addition, Subtraction,
Multiplication, division, percentage and even Power. The code is extremelysimple
and very easy to understand.

#include<iostream.h>
#include<conio.h>
#include<math.h>
void main()
{
    long double x,y;
    char ch,ar;
    do
       {
    clrscr();
    cout<<"
            *WELCOME TO CALCULATOR*
";
    cout<<"
This is a Calculator containing the following functions

Addition
 Subtraction
 Multiplication
 Division
 Percentage

Power
";
    cout<<"
Type
 [+] for Addition
 [-] for Subtraction
 [*] for
Multiplication
 [/] for Division
 [%] for Percentage
 [^] for
Power
";
    cout<<"
Enter Function To use =  ";
    cin>>ch;
    cout<<(char)7;
    cout<<endl;
    //For Addition
       if(ch=='+')
        {
        clrscr();
        cout<<"
You are using Addition
";
        cout<<"
Enter First Number= ";
        cin>>x;

        cout<<"
Enter Second Number= ";
        cin>>y;

        cout<<"
Your answer is ";
        cout<<x+y;
        cout<<(char)7;
        }
    // For Subtraction
     if(ch=='-')
        {
        clrscr();
        cout<<"
You are using Subtraction
";
        cout<<"
Enter First Number= ";
        cin>>x;
        cout<<"
Enter Second Number= ";
        cin>>y;
        cout<<"
Your answer is ";
        cout<<x-y;
        cout<<(char)7;
        }
    // For Multiplication
     if(ch=='*')
        {
        clrscr();
        cout<<"
You are using Multiplication
";
        cout<<"
Enter First Number= ";
        cin>>x;
        cout<<"
Enter Second Number= ";
        cin>>y;
        cout<<"
Your answer is ";
        cout<<x*y;
        cout<<(char)7;
        }
    // For Division
     if(ch=='/')
        {
        clrscr();
        cout<<"
You are using Division
";
        cout<<"
Enter First Number= ";
        cin>>x;
        cout<<"
Enter Second Number= ";
        cin>>y;
        cout<<"
Your answer is ";
        cout<<x/y;
        cout<<(char)7;
        }
        // For Percentage
     if(ch=='%')
        {
        clrscr();
        cout<<"
You are using Percentage
";
        cout<<"
Enter Number= ";
        cin>>x;
        cout<<"
Enter Percentage= ";
        cin>>y;
        cout<<"
Your answer is ";
        cout<<y/100*x;
        cout<<(char)7;
    }
        //For Power
    if(ch=='^')
        {
        clrscr();
        cout<<"
You are using Power
";
        cout<<"
Enter Number= ";
        cin>>x;
        cout<<"
Enter Power= ";
        cin>>y;
        cout<<"
Your answer is ";
        cout<<pow(x,y);
        cout<<(char)7;
    }
        cout<<endl;
        cout<<"
Do you want to continue..Y/N?";
        cin>>ar;

        }
        while(ar=='Y'|| ar=='y');
        if(ar=='N' || ar=='n')
        {
            cout<<"
Thankyou for using this Calculator.Good Bye.
";
            cout<<"
Press any key to exit.......";
        }

        getch();
        cout<<(char)7;

}