FILE *fp1, *fp2;
    char teller[30],teller_1[30],src[30],des[30];

    printf("请输入原文件名。\n");
        scanf("%s\n",fp1);
        fgets(teller,30,fp1);
    printf("请输入新的文件名。\n");
        scanf("%s\n",fp2);
        fgets(teller_1,30,fp2);
    printf("请输入要查找的字符串: \n");
        scanf("%3s\n",src);
        fputs(src,fp1);
    printf("请输入你要替换的字符串： \n");
        scanf("%3s\n",des);
        fputs(des,fp2);
老提示在fgetch和fputc处出现错误