5.7.if | ||||
5.7.1. | The basic format of an if statement | |||
5.7.2. | The expression in an if statement must be a boolean expression. | |||
5.7.3. | Use an else block to execute code that is executed under the conditions that the test returns false. | |||
5.7.4. | Use if/else in a nested fashion, refining conditions to more specific, or narrower, tests at each point. |