View Compilation Error

0_0_17672875_10173.cpp: In function 'int main()':
0_0_17672875_10173.cpp:6:5: error: '_int64' was not declared in this scope
     _int64 a[25]={0,0,1,2},fz,fm,sum;
     ^
0_0_17672875_10173.cpp:6:27: error: expected primary-expression before ',' token
     _int64 a[25]={0,0,1,2},fz,fm,sum;
                           ^
0_0_17672875_10173.cpp:6:28: error: 'fz' was not declared in this scope
     _int64 a[25]={0,0,1,2},fz,fm,sum;
                            ^
0_0_17672875_10173.cpp:6:31: error: 'fm' was not declared in this scope
     _int64 a[25]={0,0,1,2},fz,fm,sum;
                               ^
0_0_17672875_10173.cpp:6:34: error: 'sum' was not declared in this scope
     _int64 a[25]={0,0,1,2},fz,fm,sum;
                                  ^
0_0_17672875_10173.cpp:8:9: error: 'a' was not declared in this scope
         a[i]=(i-1)*(a[i-1]+a[i-2]);
         ^
0_0_17672875_10173.cpp:18:13: error: 'a' was not declared in this scope
   sum=fz/fm*a[m];
             ^