View Compilation Error

0_0_15176667_7029.cpp: In function 'int main()':
0_0_15176667_7029.cpp:6:17: error: 'o' was not declared in this scope
     if(a==0&&b==o)
                 ^
0_0_15176667_7029.cpp:7:2: error: break statement not within loop or switch
  break;
  ^