View Compilation Error

0_0_11557245_29091.c:2:20: iostream: No such file or directory
0_0_11557245_29091.c:3:19: cstring: No such file or directory
0_0_11557245_29091.c:4:17: stack: No such file or directory
0_0_11557245_29091.c:6: error: syntax error before "namespace"
0_0_11557245_29091.c:11: error: syntax error before '<' token
0_0_11557245_29091.c: In function `main':
0_0_11557245_29091.c:21: error: `s' undeclared (first use in this function)
0_0_11557245_29091.c:21: error: (Each undeclared identifier is reported only once
0_0_11557245_29091.c:21: error: for each function it appears in.)