Catalog

One 、 The role of circulation

Two 、while sentence

3、 ... and 、while Loop examples

Four 、 Dead cycle

5、 ... and 、break keyword

6、 ... and 、while And break Combined with examples

One 、 The role of circulation

• Give Way Specified code Repeated execution .

Two 、while sentence

• Application scenarios ：while The most common application scenario for loops is , Let the specified code , According to the specified number of times , repeat .
• while sentence Basic grammar

3、 ... and 、while Loop examples

• Print 100 This time I was wrong

• Calculation 0~100 The sum of all the numbers

Four 、 Dead cycle

• Definition ： Since the cycle conditions are always met , The program will continue to run , A cycle that does not stop .
• Be careful ： Under certain scenario requirements , When the program needs to be executed repeatedly , It can be set as an endless loop ？ What scene ？

5、 ... and 、break keyword

• Definition ： When a condition is met , Exit the current loop statement ：
• Be careful ：break Is a keyword used exclusively in circular statements .

6、 ... and 、while And break Combined with examples

•   All together 5 An apple , Finish the first one , Eat the second one …
• If you eat in the process , The third one is full , You don't need to eat the second one 4 First and fifth Apple , That is, the action of eating apples stops .