/in/foo.cc: In function 'int main()':
/in/foo.cc:9:9: error: 'i' was not declared in this scope
     for(i=0;i<m;i++)
         ^
/in/foo.cc:11:14: error: 'a' was not declared in this scope
         cin>>a>>b;
              ^
/in/foo.cc:11:17: error: 'b' was not declared in this scope
         cin>>a>>b;
                 ^
/in/foo.cc:15:9: error: 'i' was not declared in this scope
     for(i=0;i<=l;i++)
         ^