View Compilation Error

0_0_1858691_4212.c:1:19: iostream: No such file or directory
0_0_1858691_4212.c:2: error: syntax error before "namespace"
0_0_1858691_4212.c:3: error: syntax error before "fb"
0_0_1858691_4212.c:3: error: syntax error before "x"
0_0_1858691_4212.c: In function `fb':
0_0_1858691_4212.c:5: error: `x' undeclared (first use in this function)
0_0_1858691_4212.c:5: error: (Each undeclared identifier is reported only once
0_0_1858691_4212.c:5: error: for each function it appears in.)
0_0_1858691_4212.c: In function `main':
0_0_1858691_4212.c:14: error: `__int64' undeclared (first use in this function)
0_0_1858691_4212.c:14: error: syntax error before "n"
0_0_1858691_4212.c:15: error: `n' undeclared (first use in this function)