0_0_32089813_12074.c 0_0_32089813_12074.c(34) : error C2065: “flag”: 未声明的标识符 0_0_32089813_12074.c(41) : error C2059: 语法错误:“return” 0_0_32089813_12074.c(42) : error C2059: 语法错误:“}”