以下是我写的一个输出7阶幻方的程序，大家帮忙看一下，为什么运行出来的是乱码？
# include <stdio.h>
main()
{int a[7][7],i,j;

for(i=0;i<=6;i++)
 for (j=0;j<=6;j++)
{ a[0][3]=1;
if (i>=1&&i<=6&&j>=0&&j<=5&&a[i][j]!=0&&a[i-1][j+1]==0)
a[i-1][j+1]=a[i][j]+1;
else if (i==0&&j<6&&a[0][j]!=0&&a[6][j+1]==0)
a[6][j+1]=a[0][j]+1;
else if (j==6&&i!=0&&a[i][6]!=0&&a[i-1][0]==0)
a[i-1][0]=a[i][6]+1;
else if (i==0&&j==6&&a[0][6]!=0&&a[1][6]==0)
a[1][6]=a[0][6]+1;
printf("%8d",a[i][j]);
if (j==6)
printf("\n");
}
printf("\n");}

没初始化

坐等高手出现

没有初始化、？

#include"stdio.h"//罗伯特法
void main()
{
    int a[7][7],m,n,i,j;
    m=0;n=3;
    for( i=0;i<7;i++)
        for( j=0;j<7;j++)
            a[i][j]=0;
        a[0][3]=1;
        for(i=2;i<50;i++)
        {
            if(m==0||n==6)
            {
                if(m==0&&n!=6)
                {
                    m=6;
                    n=n+1;
                    if(a[m][n]==0){a[m][n]=i;continue;}
                    else {m=1;n=n-1;a[m][n]=i;continue;}
                    
                }
                if(m!=0&&n==6)
                {
                    m=m-1;
                    n=0;
                    if(a[m][n]==0){a[m][n]=i;continue;}
                    else {n=6;m=m+1;a[m][n]=i;continue;}

                }
                if(m==0&&n==6)
                {
                    m=1;n=6;
                    a[m][n]=i;
                    continue;

                }

            }
            else
            {
                m=m-1;
                n=n+1;
                if(a[m][n]==0){a[m][n]=i;continue;}
                else
                {
                    m=m+2;
                    n=n-1;
                    a[m][n]=i;
                    continue;
                }
            }

        
        }
        for(i=0;i<7;i++)
        {for(j=0;j<7;j++)
                printf("%5d",a[i][j]);
        printf("\n");
        }
}