For Statement

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TMT Pascal Language Description

Pascal Language Structure

Statements

For Statement

The for statement allows for repetitive execution of one or more statements. for executes a loop for a predetermined number of iterations. for statements take the following form:

for variable := expression to | downto expression do statement

where variable must be of ordinal type. The first expression following variable is the initial value that is assigned to variable and the second expression is the limit on the range of values assigned to variable. Both expressions must be of compatible type.

The to or downto clause specify specifies whether a variable is incremented or decremented after each iteration of the loop. If to is specified, the variable is incremented until it hits the limit of the second expression. downto decrements variable until it reaches the lower limit of the second expression.

The following are examples of for loops:

for i := 1 to 100 do
  begin
    WriteLn(i);
    Intarray[i] := i + 4;
  end;

for x := 5 downto 2 do
  WriteLn(x);

A for loop is not executed if the first expression is greater than or less then the second expression depending upon whether a to or downto was specified. For instance the following for loop is not executed:

for i := 5 to 4 do
  WriteLn('Will never output this string!');

For a loop, the index variable must either be global or local to the procedure to which it belongs.


Case Statement	Table of Content	Goto Statement

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