用C语言编写并输出4*5的矩阵

C语言代码表示

代码实现1

#include<stdio.h>

int main()
{
	int i, j, n = 0; 
	for (i = 1; i <= 4; i++)
	{
		for (j = 1; j <= 5; j++, n++)
		{
			if (n % 5 == 0)
			{
				printf("\n");
			}
			printf("%d\t", i * j);
		}
		printf("\n");
	}

	return 0;
}

代码实现2

#include <stdio.h>

int main()
{
	int i, j, k, l;
	for (i = 1; i <= 5; i++)
	{
		printf("%d\t", i);
	}
	printf("\n");

	for (j = 2; j <= 10; j = j + 2)
	{
		printf("%d\t", j);
	}
	printf("\n");

	for (k = 3; k <= 15; k = k + 3)
	{
		printf("%d\t", k);
	}
	printf("\n");

	for (l = 4; l <= 20; l = l + 4)
	{
		printf("%d\t", l);
	}
	printf("\n");

	return 0;
}