View Compilation Error

0_0_10838755_11752.cpp: In function `int main()':
0_0_10838755_11752.cpp:15: error: `__int64_t' undeclared (first use this function)
0_0_10838755_11752.cpp:15: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_10838755_11752.cpp:15: error: expected `;' before "x"