问题原因:switch中case里面的局部变量出错 解决方法:将case里面定义的局部变量在switch外面定义。 //报错情况switch(fork()) {case-1:error(1, errno,"fork");case0:// 子进程执行命令if(execvp(args[0], args) ==-1) {error(1, errno,"execvp"); }default:// 父进程等待子进程结束intwstatus;pid_tp...
错误信息 "error: a label can only be part of a statement and a declaration is not a statement" 表明在C语言代码中,标签(label)后面直接跟了一个声明(declaration),这是不允许的。在C语言中,标签只能用于语句的开始,而不能直接用于声明。 确定导致该错误的代码上下文 假设有以下错误的代码片段: c #inclu...
用switch的时候发现一个错误 a label can only be part of a statement and a declaration is not a statement 仔细观察以后发现是没有正确的加大括号引起的。 出错的代码如下 swtch (a)case 'a': ... ... ... ... break;case 'b': ... ... ...
The “a label can only be part of a statement and a declaration is not a statement” error occurs in C when it encounters a declaration immediately after a label. The C language standard only allows statements to follow a label. The language does not group declarations in the same cate...
因此,错误a label can only be part of a statement and a declaration is not a statement只有在程序中声明紧跟在标签之后才会出现。 当我们在标签和声明之后添加printf语句时,没有抛出任何错误。 在C 中使用 switch 语句时标签只能是语句的一部分而声明不是语句错误 ...
error: a label can only be part of a statement and a declaration is not a statement switch(a){ swtch(a){ case 1: case 1:... { ... ... ...break; ...case 2: } break; break;} ...
a label can only be part of a statement and a declaration is not a statement,在写代码的时候,变量的声明不应该出现在label之后,比如switch语句中的case结构也可能会遇到类似的问题。PS:从一个#if…#e
用switch 的时候发现一个错误 a label can only be part of a statement and a declaration is not a statement 仔细观察以后发现是没有正确的加大括号引起的。 出错的代码如下 swtch (a) case 'a': ... ... ... ... break; case 'b': ... ... ... ... break; default: break; 然后编译的...
The error thata label can only be part of a statement and a declaration is not a statementalso occurs while using theswitchstatement in C. This is because the C language treats the cases similar to labels. Therefore, whenever we try to declare anything just after a case, the...
error: a label can only be part of a statement and a declaration is not a statement switch(a){ swtch(a){ case 1: case 1: ... { ... ... ... ... break; ... case 2: } break; break; } case 2: break; } Error OK case1: //此块代码不能再声明变量,如果...