View Compilation Error

0_0_16532237_31740.cpp: In function 'int main()':
0_0_16532237_31740.cpp:4:5: error: '__int64_t' was not declared in this scope
     __int64_t n,a=0,b=1;
     ^
0_0_16532237_31740.cpp:5:16: error: 'n' was not declared in this scope
     while(cin>>n,n!=-1){
                ^
0_0_16532237_31740.cpp:12:13: error: 'a' was not declared in this scope
             a=a+b;
             ^
0_0_16532237_31740.cpp:12:17: error: 'b' was not declared in this scope
             a=a+b;
                 ^
0_0_16532237_31740.cpp:15:19: error: 'b' was not declared in this scope
             cout<<b;
                   ^
0_0_16532237_31740.cpp:17:9: error: 'a' was not declared in this scope
         a=0;
         ^
0_0_16532237_31740.cpp:18:9: error: 'b' was not declared in this scope
         b=1;
         ^