View Compilation Error

0_0_24991255_30195.cpp: In function 'int main()':
0_0_24991255_30195.cpp:7:2: error: '_int64' was not declared in this scope
  _int64 num=1;
  ^
0_0_24991255_30195.cpp:9:4: error: 'num' was not declared in this scope
    num=num*i;
    ^