View Compilation Error

0_0_7738366_24473.cpp: In function `int main()':
0_0_7738366_24473.cpp:5: error: `_int64' undeclared (first use this function)
0_0_7738366_24473.cpp:5: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_7738366_24473.cpp:5: error: expected `;' before "n"
0_0_7738366_24473.cpp:6: error: `n' undeclared (first use this function)
0_0_7738366_24473.cpp:8: error: `x' undeclared (first use this function)
0_0_7738366_24473.cpp:11: error: `a' undeclared (first use this function)
0_0_7738366_24473.cpp:15: error: `t' undeclared (first use this function)
0_0_7738366_24473.cpp:18: error: `b' undeclared (first use this function)