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Perl » Statement » If 
1.A program containing a simple example of an if statement.
2.A program that uses the if-else statement.
3.A program that uses the if-elsif-else statement.
4.Conditional Control Statements
5.Conditional Modifiers and print
6.Conditional Modifiers: The if Modifier
7.Extend the if statement to include an else block
8.If and else
9.If start with - no repeat
10.If statement and integer comparsion
11.If statement in a while statement
12.If statement ladder
13.If statement with else
14.If statement with scalar variable
15.Nest if statement into for loop
16.Perl has a number of string comparison operators you can use in if statements.
17.Plural format and ternary operator
18.Plural message
19.Plural output with if statement
20.The if Construct
21.The if/else Construct
22.The if/elsif/else Construct
23.Use an elsif statement to check if a different condition is true
24.Use if statement to check the integer value
25.Using if statement to check if a variable has been defined
26.Using if statement to check if a variable is zero
27.Using if statement to check the number entered from keyboard
28.Using if statements with relational and equality operators
29.Using the equality-comparison operator to compare two numbers entered at the keyboard.
30.Using the if elsif statement to check the number entered from keyboard
31.if in a while loop
32.if scope
33.if statement
34.if/else statement
35.if/elsif statement
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