0_0_13491883_27738.c 0_0_13491883_27738.c(29) : error C2061: 语法错误: 标识符“by” 0_0_13491883_27738.c(29) : error C2059: 语法错误:“;” 0_0_13491883_27738.c(29) : error C2059: 语法错误:“:”