Calculator in c, c++, cpp or turbo c

How to make an calculator in C++

The source code bellow is the simple sample calculator in cpp, c++ or c. This will serve as tutorial for the beginners who want to learn c language. This simple calculator that I make, allows the user to inputs 2(two) numbers and choose an operation to be used.

Instead of using symbols such as +(add), -(minus), *(multiply) and /(divide), I use letter to represent a single operation.

This are the following letter that I used:
• A = Addition
• S = Subtraction
• M = Multiplication
• D = Division

If the user input another letter that does not include to the choices, 'invalid operation' will show.

Basic knowledge

If else statement, declaring variables, data types, printf, scanf,

Advantage
• It can compute number with decimal point.
• Easy to use and understand.
• It shows the complete answer together with the user’s input.

Disadvantage
• Only 2 numbers are allow to input.
• It can’t perform multiple operations at a time.
• Decimal point always shows (because I use float data type)

*My Compiler is turbo c.

The calculator source code in c++,c or cpp

#include<stdio.h>
#include<conio.h>
#include<ctype.h>
#define p printf
#define s scanf
 main()
 {
 float fnum,snum,ans;
 char operation, ope;
 clrscr();
 p("Simple Calculator \n A=adddition, S=subtraction, M=multiplication, D=division\n");
 p("First number:");
 s("%f",&fnum);
 p("Operation:");
 operation=getche();
 operation=toupper(operation);
 p("\nSecond Number:");
 s("%f",&snum);
  if(operation=='A'){
  ope='+';
  ans=fnum+snum;}
  else if (operation=='S'){
  ope='-';
  ans=fnum-snum;}
  else if (operation=='M'){
  ope='x';
  ans=fnum*snum;}
  else if (operation=='D'){
  ope='/';
  ans=fnum/snum;}
  else p("Invalid Operation!");
  p("%f %c %f the Answer is %f",fnum, ope, snum, ans);
 getch();
}

I hope you like my tutorial in making an easy and simple calculator in C, C++ or CPP. So for the beginners (like me) out there, what are you waiting for try it now!