#include "stdio.h"
#include "string.h"
int main()
{
    FILE *fp;
    char arr_in[][10]={"London","Paris","Bon","Rome","Tokoyo","Detroit","Moscow",
                    "Jerualern","Bombery","Beijing"};//10个字符串
    char arr_out[20][20];
    int i;
    fp=fopen("in&out.txt","w");//没有文件就创建
    for(i=0;i<=9;i++)
      fprintf(fp,"%10s",arr_in[i]);//注意格式    
    rewind(fp);
    printf("由文件输出屏幕\n");
    i=0;
    while(!feof(fp))
    {
      fscanf(fp,"%10s",arr_out[i++]);
    }
    fclose(fp);
    for(i=0;i<=9;i++)
     printf("%s",arr_out[i]);
      
}

fp=fopen("in&out.txt","wt+");//设置成可读写

怎么把这点疏忽了 谢了 怪不得