C语言:error: a label can only be part of a statement and a declaration is not a statement|
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场景还原
一个简单的switch语句Demo
#include<stdio.h>int main(){ int a=1, b=2, re; char c; scanf("%c", &c); switch(c) { case '+': re = a + b; break; case '$': re = a - b; re++; break; case '#': int other = 3; re = a + b + other; break; default: printf("Illegal input!\n"); break; } printf("%d\n", re);}
出错原因
在switch语句里定义了新的变量。在上例中在case '#'
语句块中定义了新的变量other。
解决办法
给定义了新变量的case语句块套上大括号,这个错误就没了。
改后代码
#include<stdio.h>int main(){ int a=1, b=2, re; char c; scanf("%c", &c); switch(c) { case '+': re = a + b; break; case '$': re = a - b; re++; break; case '#': { int other = 3; re = a + b + other; break; } default: printf("Illegal input!\n"); break; } printf("%d\n", re);}
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