c how to program 习题2.17

//c how to program 习题2.17
#include <stdio.h>
int main(void)
{
	printf("1 2 3 4\n\n");
	printf("%d %d %d %d\n\n", 1,2,3,4);
	printf("1 ");
	printf("2 ");
	printf("3 ");
	printf("4\n");
}