View Compilation Error

0_0_32373836_25981.cpp: In function 'int main()':
0_0_32373836_25981.cpp:13:16: error: 'X' was not declared in this scope
       if(a[i]!=X)
                ^
0_0_32373836_25981.cpp:15:6: error: expected ';' before '}' token
      }
      ^