/in/foo.cc: In function 'int main()':
/in/foo.cc:100:18: warning: unused variable 'num1' [-Wunused-variable]
  int x1,y1,x2,y2,num1=0,num2=0,na1=0,na2=0;
                  ^~~~
/in/foo.cc:100:25: warning: unused variable 'num2' [-Wunused-variable]
  int x1,y1,x2,y2,num1=0,num2=0,na1=0,na2=0;
                         ^~~~