0_0_37187255_22754.c 0_0_37187255_22754.c(4) : error C2065: “cin”: 未声明的标识符 0_0_37187255_22754.c(10) : error C2065: “cout”: 未声明的标识符 0_0_37187255_22754.c(10) : error C2065: “endl”: 未声明的标识符