View Compilation Error

0_0_3016851_16430.c:1:19: iostream: No such file or directory
0_0_3016851_16430.c:2: error: syntax error before "namespace"
0_0_3016851_16430.c: In function `RidLastZ':
0_0_3016851_16430.c:11: error: `NULL' undeclared (first use in this function)
0_0_3016851_16430.c:11: error: (Each undeclared identifier is reported only once
0_0_3016851_16430.c:11: error: for each function it appears in.)
0_0_3016851_16430.c: In function `main':
0_0_3016851_16430.c:20: error: `cin' undeclared (first use in this function)