View Compilation Error

0_0_23266407_25645.cpp: In function 'int main()':
0_0_23266407_25645.cpp:4:5: error: '_int64' was not declared in this scope
     _int64 x[51]={0,1};
     ^
0_0_23266407_25645.cpp:7:9: error: 'x' was not declared in this scope
         x[y]=x[y-1]+x[y-2];
         ^
0_0_23266407_25645.cpp:9:9: error: expected ')' before 'printf'
         printf("%I64d\n",x[y]);
         ^
0_0_23266407_25645.cpp:9:26: error: 'x' was not declared in this scope
         printf("%I64d\n",x[y]);
                          ^