View Compilation Error

0_0_15684085_14957.cpp: In function 'int main()':
0_0_15684085_14957.cpp:5:2: error: '_int64' was not declared in this scope
  _int64 s;
  ^
0_0_15684085_14957.cpp:9:9: error: 's' was not declared in this scope
         s=a+b,i=0;
         ^