foo.cc: In function 'int main()':
foo.cc:6:23: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
    6 |         bool l=(y%4==0&&y%100||y%400==0)
      |                 ~~~~~~^~~~~~~
foo.cc:7:9: error: expected ',' or ';' before 'switch'
    7 |         switch(m)
      |         ^~~~~~
foo.cc:6:14: warning: unused variable 'l' [-Wunused-variable]
    6 |         bool l=(y%4==0&&y%100||y%400==0)
      |              ^

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