Episode 6: Using if Statements

An if statement tests conditions, executing a block of statements when a

condition is true.

The general format of an if conditional statement is as follows:

if ( condition )

{

block of statements

}

elseif  ( condition )

{

block of statements

}

else

{

block of statements

}

The if statement consists of three parts:

if: This part is required. Only one if is allowed. It tests a condition:

• If the condition is true: The block of statements is executed. After the statements are executed, the script moves to the next instruction following the conditional statement; if the conditional statement contains any elseif or else sections, the script skips over them.

• If the condition is not true: The block of statements is not executed. The script skips to the next instruction, which can be an elseif, an else, or the next instruction after the if conditional statement.

elseif: This part is optional. You can use more than one elseif if you want. An elseif also tests a condition:

• If the condition is true: The block of statements is executed. After executing the block of statements, the script goes to the next instruction following the conditional statement; if the if statement contains any additional elseif sections or an else section, the script skips over them.

• If the condition is not true: The block of statements is not executed. The script skips to next instruction, which can be an elseif, an else, or the next instruction after the if conditional statement.

else: This part is also optional. Only one else is allowed. This part doesn’t test a condition, but rather it executes the block of statements. The script enters the else section only when the if section and all the elseif sections are not true.

Written by “Shojib”