/in/foo.cc: In function 'int main()':
/in/foo.cc:60:9: warning: 'num1' may be used uninitialized in this function [-Wmaybe-uninitialized]
   ++num1;
         ^
/in/foo.cc:66:9: warning: 'num2' may be used uninitialized in this function [-Wmaybe-uninitialized]
   ++num2;
         ^
/in/foo.cc:80:9: warning: 'num3' may be used uninitialized in this function [-Wmaybe-uninitialized]
   ++num3;
         ^
/in/foo.cc:86:9: warning: 'num4' may be used uninitialized in this function [-Wmaybe-uninitialized]
   ++num4;
         ^