/in/foo.cc: In function 'int main()':
/in/foo.cc:29:15: warning: 'm1' is used uninitialized [-Wuninitialized]
   29 |         m=days(m1,d1);
      |           ~~~~^~~~~~~
/in/foo.cc:26:13: note: 'm1' was declared here
   26 |         int m1,d1,m2,d2;
      |             ^~
/in/foo.cc:29:15: warning: 'd1' is used uninitialized [-Wuninitialized]
   29 |         m=days(m1,d1);
      |           ~~~~^~~~~~~
/in/foo.cc:26:16: note: 'd1' was declared here
   26 |         int m1,d1,m2,d2;
      |                ^~
/in/foo.cc:30:15: warning: 'm2' is used uninitialized [-Wuninitialized]
   30 |         n=days(m2,d2);
      |           ~~~~^~~~~~~
/in/foo.cc:26:19: note: 'm2' was declared here
   26 |         int m1,d1,m2,d2;
      |                   ^~
/in/foo.cc:30:15: warning: 'd2' is used uninitialized [-Wuninitialized]
   30 |         n=days(m2,d2);
      |           ~~~~^~~~~~~
/in/foo.cc:26:22: note: 'd2' was declared here
   26 |         int m1,d1,m2,d2;
      |                      ^~