How to make a simple program in pascal ?

hi guys, i would like to tell you about how to make a program in pascal application..
i will give you some example, like to make a carculator in pascal..
this is the code :

program carculator;
uses crt;
var
a,b,c:integer;
begin
clrscr;
writeln('This is a simple addition calculating program');
write('Put in the first number  ');readln(a);
write('Put in the second number  ');readln(b);
c:=a+b;
writeln('the result of the sum above is  ',c); 
readln; 
end.

that's the simple carculating program, if you want to change it to others, i will give you the formula:
c:=a div b <-- divide
c:=a-b <-- reduction
c:=a*b <-- times
c:=a+b <-- sum
to save the program after you input the script press F2
to run it press CTRL + F9



btw.. sorry for my bad english :P
have fun tried it :)