View Compilation Error

0_0_12092014_8549.cpp:15: error: `_int64' does not name a type
0_0_12092014_8549.cpp: In function `int main()':
0_0_12092014_8549.cpp:31: error: `f' undeclared (first use this function)
0_0_12092014_8549.cpp:31: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_12092014_8549.cpp:40: error: `_int64' undeclared (first use this function)
0_0_12092014_8549.cpp:40: error: expected `;' before "tot"
0_0_12092014_8549.cpp:43: error: `tot' undeclared (first use this function)
0_0_12092014_8549.cpp:45: error: `b' undeclared (first use this function)