View Compilation Error

0_0_6619373_15292.cpp: In function `int main()':
0_0_6619373_15292.cpp:6: error: `_int64' undeclared (first use this function)
0_0_6619373_15292.cpp:6: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_6619373_15292.cpp:6: error: expected `;' before "a"
0_0_6619373_15292.cpp:12: error: `c' undeclared (first use this function)
0_0_6619373_15292.cpp:13: error: `a' undeclared (first use this function)
0_0_6619373_15292.cpp:38: error: `flag' undeclared (first use this function)
0_0_6619373_15292.cpp:46: error: `num' undeclared (first use this function)