C语言创建对称矩阵

#include <stdio.h>

int i,j,a[10][10] ={0};

/*int a[4][4] = {
	{1,2,3,4},
	{2,2,2,3},
	{3,2,3,4},
	{4,3,4,4},
};*/

int main()
{	srand((unsigned) time(NULL)); //用时间做种，每次产生随机数不一栿
	for(i=0;i<10;++i)
	{
		//a[i][0] = i+1;
		for(j=0;j<10;++j)
		{
			if(j>i) a[i][j] = rand()%10+1;			
			else if(i>j) a[i][j] = a[j][i];
			else a[i][j] = rand()%3+1;
		}
	}
	for(i=0;i<10;++i)
	   {   for(j=0;j<10;++j)
			   printf("%4d",a[i][j]);
	   printf("\n");}
	return 0;
}