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                # C 編程中的`break`語句 > 原文: [https://beginnersbook.com/2014/01/c-break-statement/](https://beginnersbook.com/2014/01/c-break-statement/) `break`語句用于循環內部和[`switch case`](https://beginnersbook.com/2014/01/switch-case-statements-in-c/) 。 ## C - `break`語句 它用于立即退出循環。當在循環內遇到`break`語句時,控制流直接退出循環并且循環終止。它與[`if`語句](https://beginnersbook.com/2014/01/c-if-statement/)一起使用,只能在循環內使用。 這也可用于`switch-case`控制結構。每當在`switch-case`中遇到它時,控制器都會從`switch-case`中出來(參見下面的例子)。 ### `break`語句的流程圖 ![C break statement](https://img.kancloud.cn/13/c6/13c6e4314a645177ecb487d48d7c7b0a_450x400.jpg) 語法: ```c break; ``` ### 示例 - 在`while`循環中使用`break` ```c #include <stdio.h> int main() { int num =0; while(num<=100) { printf("value of variable num is: %d\n", num); if (num==2) { break; } num++; } printf("Out of while-loop"); return 0; } ``` **輸出:** ```c value of variable num is: 0 value of variable num is: 1 value of variable num is: 2 Out of while-loop ``` ### 示例 - 在`for`循環中使用`break` ```c #include <stdio.h> int main() { int var; for (var =100; var>=10; var --) { printf("var: %d\n", var); if (var==99) { break; } } printf("Out of for-loop"); return 0; } ``` **輸出:** ```c var: 100 var: 99 Out of for-loop ``` ### 示例 - 在`switch-case`中使用`break`語句 ```c #include <stdio.h> int main() { int num; printf("Enter value of num:"); scanf("%d",&num); switch (num) { case 1: printf("You have entered value 1\n"); break; case 2: printf("You have entered value 2\n"); break; case 3: printf("You have entered value 3\n"); break; default: printf("Input value is other than 1,2 & 3 "); } return 0; } ``` 輸出: ```c Enter value of num:2 You have entered value 2 ``` 您總是希望在`switch case`塊中使用`break`語句,否則一旦執行了`case`塊,其余的后續 case 塊就會執行。例如,如果我們不在每個`case`塊之后使用`break`語句,那么這個程序的輸出將是: ```c Enter value of num:2 You have entered value 2 You have entered value 3 Input value is other than 1,2 & 3 ```
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