4.4. Alternative execution¶
A second form of the
if statement is alternative
execution, in which there are two possibilities and the
condition determines which one gets executed. The syntax looks like
If the remainder when
x is divided by 2 is 0, then we know
x is even, and the program displays a message to that
effect. If the condition is false, the second set of statements is
Since the condition must either be true or false, exactly one of the alternatives will be executed. The alternatives are called branches, because they are branches in the flow of execution.
The following program should print out “x is even” if the remainder of x divided by 2 is 0 and “x is odd” otherwise, but the code is mixed up. Be sure to indent correctly!