NESTED LOOPS
A for loop can occur within another, so that the inner loop (which contains a block of statements) is repeated by the outer loop.

RULES RELATED TO NESTED FOR LOOPS
1. Each loop must use a seperate variable
2. The inner loop must begin and end entirely within the outer loop.

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CLASS EXERCISE
Determine the output of the following program,

	program  NESTED_FOR_LOOPS (output);

	var      line, column : integer;

	begin

	         writeln('LINE');

	         for  line := 1 to 6 do

	         begin

	             write( line:2 );

	             for  column := 1 to 4 do

	             begin

	                 write('COLUMN':10);   write(column:2)

	             end;

	             writeln

	         end

	end.

Class exercise .. output of program NESTED_FOR_LOOPS is,

	LINE

	 1    COLUMN 1    COLUMN 2    COLUMN 3    COLUMN 4

	 2    COLUMN 1    COLUMN 2    COLUMN 3    COLUMN 4

	 3    COLUMN 1    COLUMN 2    COLUMN 3    COLUMN 4

	 4    COLUMN 1    COLUMN 2    COLUMN 3    COLUMN 4

	 5    COLUMN 1    COLUMN 2    COLUMN 3    COLUMN 4

	 6    COLUMN 1    COLUMN 2    COLUMN 3    COLUMN 4