0_0_31448561_22494.c 0_0_31448561_22494.c(3) : error C2061: 语法错误: 标识符“namespace” 0_0_31448561_22494.c(3) : error C2059: 语法错误:“;” 0_0_31448561_22494.c(18) : error C2065: “K”: 未声明的标识符 0_0_31448561_22494.c(19) : error C2065: “K”: 未声明的标识符