c++语句switch语句

The error: case label not within a switch statement occurs in C language with switch case statement, when switch (variable/value) statement is terminated by the semicolon (;).

错误：当switch(变量/值)语句由分号( ; )终止时，C语言中的case标签使用switch case语句以C语言出现。

Example:

例：

#include 
    
     int main(void) {
   		int choice = 2;		switch(choice);	{
   	    case 1:	        printf("Case 1\n");	        break;	    case 2:	        printf("Case 2\n");	        break;	    	    case 3:	        printf("Case 3\n");	        break;	    	    case 4:	        printf("Case 4\n");	        break;	    	    default:	        printf("Case default\n");	}		return 0;}
    

Output

输出量

prog.c: In function ‘main’:prog.c:9:6: error: case label not within a switch statement      case 1:      ^~~~prog.c:11:10: error: break statement not within loop or switch          break;          ^~~~~prog.c:12:6: error: case label not within a switch statement      case 2:      ^~~~prog.c:14:10: error: break statement not within loop or switch          break;          ^~~~~prog.c:15:6: error: case label not within a switch statement      case 3:      ^~~~prog.c:17:10: error: break statement not within loop or switch          break;          ^~~~~prog.c:18:6: error: case label not within a switch statement      case 4:      ^~~~prog.c:20:10: error: break statement not within loop or switch          break;          ^~~~~prog.c:21:6: error: ‘default’ label not within a switch statement      default:      ^~~~~~~

How to fix?

怎么修？

See the statement switch(choice); it is terminated by semicolon (;) – it must not be terminated. To fix this error, remove semicolon after this statement.

参见语句switch(choice); 它以分号( ; )终止–一定不能终止。 要解决此错误，请在此语句后删除分号。

Correct code:

正确的代码：

#include 
    
     int main(void) {
   		int choice = 2;		switch(choice)	{
   	    case 1:	        printf("Case 1\n");	        break;	    case 2:	        printf("Case 2\n");	        break;	    	    case 3:	        printf("Case 3\n");	        break;	    	    case 4:	        printf("Case 4\n");	        break;	    	    default:	        printf("Case default\n");	}		return 0;}
    

Output

输出量

Case 2

翻译自:

c++语句switch语句