View Compilation Error

0_0_14597089_6769.cpp: In function 'int main()':
0_0_14597089_6769.cpp:13:5: error: '_int64' was not declared in this scope
     _int64 a;
     ^
0_0_14597089_6769.cpp:25:13: error: 'a' was not declared in this scope
             a=1;
             ^