1.7 KiB
1.7 KiB
title |
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If-Else Statement |
Introduction
The if
statement executes a statement if a specified condition is true
. If the condition is false
, another statement can be executed using the else
statement.
Note: The else
statement is optional.
if (condition)
/* do something */
else
/* do something else */
Multiple if...else
statements can be chained to create an else if
clause. This specifies a new condition to test and can be repeated to test multiple conditions, checking until a true statement is presented to execute.
if (condition1)
/* do something */
else if (condition2)
/* do something else */
else if (condition3)
/* do something else */
else
/* final statement */
Note: If you want to execute more than one statement in the if
, else
or else if
part, curly braces are required around the statements:
if (condition) {
/* do */
/* something */
/* with multiple statements */
} else {
/* do something */
/* else */
}
Examples
Using if...else
:
// If x=5 z=7 and q=42. If x is not 5 then z=19.
if (x == 5) {
z = 7;
q = 42
else
z = 19;
Using else if
:
if (x < 10)
return "Small number";
else if (x < 50)
return "Medium number";
else if (x < 100)
return "Large number";
else {
flag = 1;
return "Invalid number";
}