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");