View Compilation Error

191145_0_8480.c: In function `main':
191145_0_8480.c:4: error: `_int64' undeclared (first use in this function)
191145_0_8480.c:4: error: (Each undeclared identifier is reported only once
191145_0_8480.c:4: error: for each function it appears in.)
191145_0_8480.c:4: error: syntax error before "num"
191145_0_8480.c:5: error: `num' undeclared (first use in this function)
191145_0_8480.c:8: error: `i' undeclared (first use in this function)
191145_0_8480.c:10: error: `n' undeclared (first use in this function)