View Compilation Error

0_0_21694221_17295.c
0_0_21694221_17295.c(2) : error C2061: 语法错误: 标识符“namespace”
0_0_21694221_17295.c(2) : error C2059: 语法错误:“;”
0_0_21694221_17295.c(6) : error C2065: “cin”: 未声明的标识符
0_0_21694221_17295.c(9) : error C2065: “cin”: 未声明的标识符
0_0_21694221_17295.c(17) : error C2065: “cout”: 未声明的标识符
0_0_21694221_17295.c(17) : error C2065: “endl”: 未声明的标识符