/in/foo.cc: In function 'int main()':
/in/foo.cc:7:2: error: 'a' was not declared in this scope
  a=n%10;
  ^
/in/foo.cc:8:2: error: 'b' was not declared in this scope
  b=n/10-10*a; 
  ^
/in/foo.cc:9:2: error: 'c' was not declared in this scope
  c=n/100;
  ^