IF [ expression ] THENIF [ expression ] THEN … ELSE …Implement the conditional jump. This implementation assumes that an expression passed as a parameter is 0 (for false) and not zero (for true). In this case, if the expression is zero, it jumps directly to the statement following the corresponding ENDIF. Otherwise, the following code will be executed (up to ENDIF).
IF ( x == 42 ) THEN IF ( x == 42 ) THEN x = 21 ELSE x = 84