foo.c: In function 'main':
foo.c:19:13: warning: suggest parentheses around comparison in operand of '&' [-Wparentheses]
   19 |         if(i&4==0&&i%100!=0||i%400==0){
      |             ^
foo.c:19:18: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   19 |         if(i&4==0&&i%100!=0||i%400==0){
      |            ~~~~~~^~~~~~~~~~
foo.c:28:19: warning: suggest parentheses around comparison in operand of '&' [-Wparentheses]
   28 |         if(D1.year&4==0&&D1.year%100!=0||D1.year%400==0){
      |                   ^
foo.c:28:24: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   28 |         if(D1.year&4==0&&D1.year%100!=0||D1.year%400==0){
      |            ~~~~~~~~~~~~^~~~~~~~~~~~~~~~
foo.c:33:13: warning: suggest parentheses around comparison in operand of '&' [-Wparentheses]
   33 |         if(i&4==0&&i%100!=0||i%400==0){
      |             ^
foo.c:33:18: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   33 |         if(i&4==0&&i%100!=0||i%400==0){
      |            ~~~~~~^~~~~~~~~~
foo.c:42:19: warning: suggest parentheses around comparison in operand of '&' [-Wparentheses]
   42 |         if(D2.year&4==0&&D2.year%100!=0||D2.year%400==0){
      |                   ^
foo.c:42:24: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   42 |         if(D2.year&4==0&&D2.year%100!=0||D2.year%400==0){
      |            ~~~~~~~~~~~~^~~~~~~~~~~~~~~~

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