if Statement in Delphi ( Delphi Tutorial # 9 )

There are two kinds of conditional statement : if statement and case statement. This both statements are for making decisions that involve two or more alternative choices or conditions.

In this tutorial, we will learn about if statement. There are two kinds of if statement :

-         if ….. then

-         if ….. then …. else

The syntax of if …. then statement is :

     If boolean expression then statement;

Boolean expression can be true or false. If it is true, computer will execute the statement. If it is false, computer will not execute the statement.

The syntax of if …. then …. else statement is :

     If boolean expression then first_statement else second_statement;

If boolean expression is true, computer will execute the first statement. If it is false, computer will execute the second statement.

The flowchart of if statement is below :

Example for if …. then statement :

program Project1;

{$APPTYPE CONSOLE}

uses SysUtils;

var

 score : integer;

begin

  write('Your score : ');

  readln(score);

  if score < 60 then writeln('You did not pass the exam');

  if score >= 60 then writeln('You passed the exam');

  readln;

end.

Example for if …. then …. else statement :

program Project2;

{$APPTYPE CONSOLE}

uses

  SysUtils;

var

 score : integer;

begin

  write('Your score : ');

  readln(score);

  if score < 60 then

    writeln('You did not pass the exam')

   else

    writeln('You passed the exam');

  readln;

end.

 

Both projects above will give you the same result.

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