>>530
課題１
#include <stdio.h>
int main( void )
{
int year;
int check;
scanf( "%d", &year );

if ( year % 400 == 0 ) {
check = 1;
}
else if ( year % 100 == 0 ) {
check = 0;
}
else if ( year % 4 == 0 ) {
check = 1;
}
else {
check = 0;
}

if ( check == 0 ) {
printf( "閏年ではありません" );
}
else {
printf( "閏年です" );
}

return 0;
}