Main.c: In function ‘main’:
Main.c:7:13: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses]
    7 |  if (y%4==0 && y%100!=0 || y%400==0)
      |      ~~~~~~~^~~~~~~~~~~
Main.c:8:3: error: expected expression before ‘int’
    8 |   int y2 = 29;
      |   ^~~
Main.c:10:6: error: expected expression before ‘int’
   10 |      int y2 = 28;
      |      ^~~