C语言 3×3矩阵转置

#include 
int main()

{
	int arr1[3][3]={100,200,300,400,500,600,700,800,900};
	int i,j,m,n,row,a,b;
	printf("原3×3矩阵为：\n");
    for(i=0;i<3;i++)
        for(j=0;j<3;j++){
			printf("%d  ",arr1[i][j]);//原矩阵为[0,0][0,1][0,2]
		if(j==2)                              //[1,0][1,1][1,2]
		{                                     //[2,0][2,1][2,2]
			printf("\n");
		}
	}
		printf("\n转置后的矩阵为\n");
		for(a=0,row=0;a<3;a++,row++){
		for(b=0;b<3;b++){
			m=b;
			n=row;
			printf("%d  ",arr1[m][n]);//转置后的矩阵为[0,0][1,0][2,0]
			if(b==2)                                //[0,1][1,1][2,1]
				printf("\n");                       //[0,2][1,2][2,2]  
		}
	}
		return 0;
}