View Compilation Error

1047877_0_0_13030.c:1:21: iostream: No such file or directory
1047877_0_0_13030.c:2: error: syntax error before "namespace"
1047877_0_0_13030.c: In function `main':
1047877_0_0_13030.c:4: error: `__int64' undeclared (first use in this function)
1047877_0_0_13030.c:4: error: (Each undeclared identifier is reported only once
1047877_0_0_13030.c:4: error: for each function it appears in.)
1047877_0_0_13030.c:4: error: syntax error before "a"
1047877_0_0_13030.c:7: error: `a' undeclared (first use in this function)
1047877_0_0_13030.c:11: error: `cin' undeclared (first use in this function)