Using if statement to check if a variable is zero

   

if ($bottom) {
    $result = $top / $bottom;
}
else {
    $ result = 0;
}

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 the number entered from keyboard
27.	Using if statements with relational and equality operators
28.	Using the equality-comparison operator to compare two numbers entered at the keyboard.
29.	Using the if elsif statement to check the number entered from keyboard
30.	if in a while loop
31.	if scope
32.	if statement
33.	if/else statement
34.	if/elsif statement

Using if statement to check if a variable is zero : If « Statement « Perl