Pascal with Mc Kenzie - Real Variables

Learn Pascal Programming with Mc Kenzie

Assigning Values

To assign a numeric value to a variable after the variable has been declared we use the colon followed by the equal sign without a space as follows x := 6;

Real Numbers

Real numbers carry a decimal point. 20 is an integer but 20.0 is real. Here is another example : 0.6 is a valid real number in Pascal but .6 alone without the zero before the point is not valid.

Before we can use a real variable in the body of a Pascal program, we must declare it.

Program Sample1 demonstrates how two real variables are declared and used in a program.

program Sample1(output);
Var
   x, y, result : real;
begin
   x := 6.50;
   y := 4.25;
   result := x / y;
   writeln('The answer is ',result)
   end.

The Sample1 program is made up of three sections:

1. The Program Heading starts with the word PROGRAM followed by the name of the program. The name of this program is Sample1 .The heading ends with the first semi-colon.

2. The declaration section begins with Var followed by a list of three variables x, y, result then a colon before the word REAL. The last character on the line is the semi-colon.

3. The body of the progarm starts with the word begin and terminates with the word end.

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