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MEL and Expressions

if...else if...else

You’ll often want you program to make decisions and change its behavior based on testing some condition. For example, only print a value if it is greater than 10. Like most languages, MEL has an if control structure:

if ($x > 10) { 
	print("It's greater than 10!\n"); 
	print("Run!!!\n"); 
} 

You can also specify code to run when the condition is not true with the else keyword:

if ($x > 10) { 
	print("It's greater than 10!\n"); 
	print("Run!!!\n"); 
} else { 
	print("It's not above 10.\n"); 
	print("It's safe... for now.\n"); 
} 

You can specify several alternatives with the else if statement:

if ( $color == "blue" ) 
	print("Sky\n");  
else if ( $color == "red" ) 
	print("Fire\n"); 
else if ($color == "yellow" ) 
	print("Sun\n"); 
else 
	print("I give up!\n");