>>455

#include <stdio.h>

int main ( void )
{
int i, j ;
int size ;

printf ( "大きさ入力：" ) ;
scanf ( "%d", &size ) ;

for ( i = 0 ; i < size ; i++ ){
for ( j = 0 ; j < size ; j++ ){
if ( j==i || j==size-i-1 ){
printf ( "%c", '*' ) ;
}
else{
printf ( "%c", ' ' ) ;
}
}
printf ( "\n" ) ;
}

return 0 ;
}