foo.c: In function 'main':
foo.c:13:24: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   if(y%400==0||y%100!=0&&y%4==0)
                ~~~~~~~~^~~~~~~~
foo.c:32:41: warning: suggest parentheses around comparison in operand of '|' [-Wparentheses]
       if(m==1||m==3||m==5||m==7||m==8||m==10|m==12)
                                        ~^~~~
foo.c:38:28: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
     if(y1%400==0||y1%100!=0&&y1%4==0)
                   ~~~~~~~~~^~~~~~~~~
foo.c:48:41: warning: suggest parentheses around comparison in operand of '|' [-Wparentheses]
       if(m==1||m==3||m==5||m==7||m==8||m==10|m==12)
                                        ~^~~~
foo.c:54:28: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
     if(y2%400==0||y2%100!=0&&y2%4==0)
                   ~~~~~~~~~^~~~~~~~~
foo.c:69:41: warning: suggest parentheses around comparison in operand of '|' [-Wparentheses]
       if(m==1||m==3||m==5||m==7||m==8||m==10|m==12)
                                        ~^~~~
foo.c:75:28: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
     if(y1%400==0||y1%100!=0&&y1%4==0)
                   ~~~~~~~~~^~~~~~~~~
foo.c:88:26: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   if(y2%400==0||y2%100!=0&&y2%4==0)
                 ~~~~~~~~~^~~~~~~~~
foo.c:20:10: warning: unused variable 'm12' [-Wunused-variable]
  int m11,m12;
          ^~~
foo.c:20:6: warning: unused variable 'm11' [-Wunused-variable]
  int m11,m12;
      ^~~
foo.c:7:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d%d",&y1,&m1,&d1);
  ^~~~~~~~~~~~~~~~~~~~~~~~~~~
foo.c:8:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d%d",&y2,&m2,&d2);
  ^~~~~~~~~~~~~~~~~~~~~~~~~~~

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