View Compilation Error

0_0_35389124_19775.cpp:2:1: error: '_int64' does not name a type
 _int64 ver(_int64 n)//要用64位的类型，要不过不了！
 ^
0_0_35389124_19775.cpp: In function 'int main()':
0_0_35389124_19775.cpp:23:5: error: '_int64' was not declared in this scope
     _int64 n1,n2,flag,a[1000],i;
     ^
0_0_35389124_19775.cpp:24:26: error: 'n1' was not declared in this scope
     while(scanf("%I64d",&n1)!=EOF)
                          ^
0_0_35389124_19775.cpp:26:9: error: 'n2' was not declared in this scope
         n2=ver(n1);
         ^
0_0_35389124_19775.cpp:26:18: error: 'ver' was not declared in this scope
         n2=ver(n1);
                  ^
0_0_35389124_19775.cpp:27:9: error: 'flag' was not declared in this scope
         flag=1;
         ^
0_0_35389124_19775.cpp:28:9: error: 'a' was not declared in this scope
         a[flag++]=n1;
         ^
0_0_35389124_19775.cpp:37:13: error: 'i' was not declared in this scope
         for(i=1;i<=flag;i++)
             ^