foo.c: In function 'Date':
foo.c:3:28: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
 #define lYear(y)  ((y%4==0)&&(y%100!=0)||(y%400==0))
                    ~~~~~~~~^~~~~~~~~~~~
foo.c:20:6: note: in expansion of macro 'lYear'
   if(lYear(i))
      ^~~~~
foo.c:3:28: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
 #define lYear(y)  ((y%4==0)&&(y%100!=0)||(y%400==0))
                    ~~~~~~~~^~~~~~~~~~~~
foo.c:26:5: note: in expansion of macro 'lYear'
  if(lYear(i))
     ^~~~~
foo.c: In function 'Mid':
foo.c:39:9: warning: implicit declaration of function 'abs' [-Wimplicit-function-declaration]
  return abs(Date(s1)-Date(s2));
         ^~~
foo.c: In function 'main':
foo.c:47:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d %d", &s1.years, &s1.months, &s1.days);
  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
foo.c:49:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d %d", &s2.years, &s2.months, &s2.days);
  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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