View Compilation Error

0_0_6137816_28660.c:1:19: iostream: No such file or directory
0_0_6137816_28660.c:2: error: syntax error before "namespace"
0_0_6137816_28660.c:5: error: syntax error before "visit"
0_0_6137816_28660.c: In function `main':
0_0_6137816_28660.c:18: error: `cin' undeclared (first use in this function)
0_0_6137816_28660.c:18: error: (Each undeclared identifier is reported only once
0_0_6137816_28660.c:18: error: for each function it appears in.)
0_0_6137816_28660.c:21: error: `bool' undeclared (first use in this function)
0_0_6137816_28660.c:21: error: syntax error before "flag"
0_0_6137816_28660.c:27: error: `flag' undeclared (first use in this function)
0_0_6137816_28660.c:34: error: `cout' undeclared (first use in this function)