1.3 KiB
Ifs and elses
Syntax
Each if statement consists of the if keyword, followed by an expression, encapsulated in parenthesis, followed by a statement. Optionally, the statement may be followed by an else keyword, which is followed by a statement on its own.
if (expression) statement
// or
if (expression) statement1 else statement2
No semicolons are required after the body of an if statement, unless the body statement itself requires one.
Terminology
The given expression is called a condition, the statement following the condition is the if body and the statement following the else keyword is called the else body
Behavior
The given expression (condition) may be of any type, and if its non-zero, then the if body will be executed. Else, if one, the else body will be executed instead.
Equivalent PPCIL assembly
For any given if-else statement:
if (condition) if_body
else else_body
Its equivalent assembly is:
;condition
jz else
; if_body
jmp end_else
else:
;else_body
end_else:
If the if doesn't have a corresponding else statement, the resulting assembly is as follows:
;condition
jz else
; if_body
else:
Possible compiler optimizations
An if body may be omitted if the condition is determined to be false. If the condition is determined to be true, then the else body is omitted.