/in/foo.cc: In function 'int main()':
/in/foo.cc:12:10: error: 'A' was not declared in this scope
          A=a[i]*100+a[j]*10+a[k];
          ^
/in/foo.cc:13:7: error: 'B' was not declared in this scope
       B=a[l]*10+a[m];
       ^
/in/foo.cc:14:7: error: 'C' was not declared in this scope
       C=
       ^
/in/foo.cc:16:6: error: expected primary-expression before '}' token
      }
      ^