(Type integer, arithmetic operators, integer operators) Write a program which reads two integers and then displays a) their product and b) their quotient when the first is divided by the second.

program ex2(input,output);

var a,b,c,d : integer;
begin
  writeln ('Enter an integer');
  readln (a);
  writeln ('Enter another integer');
  readln (b);
  c:=a * b;
  writeln (c);
  d:= a div b;
  writeln (d);
  readln;
end.

We declare 4 integers, 2 for input and 2 for calculations. We read the integers from the keyboard and then use the * to multiply them and the 'div' operator to find them number of times b goes into a. For example, 3 goes into 10 3 times (remainder 1 in integer division).

Be aware from this point that you must always check a program for potential errors, not only in the code but also in what the user might do when using it. In this case, if the user enters 0 for b then a division by zero error will result. We will develop an awareness of potential sources of error as we proceed and we will also learn programming techniques to deal with them.