#include <stdio.h>
int main(void) {
int i;
int days;
int year;
switch(i){
case 1: case 3: case 5: case 7: case 8: case 10: case 12:
days=31;
break;
case 4: case 6: case 9: case 11:
days=30;
break;
case 2:
if ((year%400 == 0)||((year%4 == 0)&&(year%100 != 0)))
days = 29;
else
days = 28;
}
return 0;
}
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