从键盘输入10个英文单词到二维字符数组中，并保存到文本文件中（单词间以空格分隔，然后再从该文件中读出所有单词并显示到屏幕。

我写的代码输入完就有问题没办法运行下去了
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define N 10

void main(void)
{
    FILE  *fp;
    char a[N][80],j=0;
    int i;
      
    if((fp = fopen("a.txt", "w")) == NULL){
        printf("Can't Open File!");
        exit(0);
    }

    printf("请输入%d个以空格分隔的单词：\n",N);

    for(i=0;i<N;i++){
        do{
            scanf("%s",&a[i][j]);
            j++;
        }while(a[i][j]!='\n');
    }
    j=0;
    if(!feof(fp)){
        for(i=0;i<N;i++){
            do{
                fprintf(fp,"%s",a[i][j]);
                j++;
                }while(a[i][j]!='\n');
            }
        }

    fclose(fp);   


    if((fp = fopen("a.txt", "r")) == NULL){
        printf("Can't Open File!");
        exit(0);
    }
    printf("显示文件中的单词：\n");

    j=0;
    while(!feof(fp)){
        for(i=0;i<=N;i++)
            do{
                i=fscanf(fp,"%s",&a[i][j]);
                if(i==EOF)break;
                printf("%s \n",a[i][j]);
                j++;
            }while(a[i][j]!='\n');
    }

    fclose(fp);
}