foo.c: In function 'main':
foo.c:15:31: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
                 if (year%4==0 && year% 100!=0||year%400==0)
                     ~~~~~~~~~~^~~~~~~~~~~~~~~
foo.c:10:1: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
 scanf("%d",&year);
 ^~~~~~~~~~~~~~~~~
foo.c:11:1: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
 scanf("%c",&space);
 ^~~~~~~~~~~~~~~~~~
foo.c:12:1: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
 scanf("%d",&month);
 ^~~~~~~~~~~~~~~~~~
foo.c:13:1: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
 scanf("%c",&space);
 ^~~~~~~~~~~~~~~~~~
foo.c:14:1: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
 scanf("%d",&day);
 ^~~~~~~~~~~~~~~~

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