int mian（）
{ FILE *fp1,*fp2,*fp3,*fp4,*fp5,*fp6;

char a[10];
char b[10];

fp1 = fopen("01.txt","r");
fp3 = fopen("02.txt","w");
fread(a,sizeof(unsigned char),8,fp1); //a里是31 32 0a
fwrite(a,sizeof(unsigned char),8,fp3); //02.txt里是31 32 0d 0a ，原因是輸入的情況下，換行回車轉換成換行，然后輸出時換行又會轉成換行回車
fclose(fp1);
fclose(fp3);

fp2 = fopen("01.txt","rb");
fp4 = fopen("03.txt","wb");
fread(b,sizeof(unsigned char),8,fp2); //b里是31 32 0d 0a
fwrite(b,sizeof(unsigned char),8,fp4); //03.txt里是31 32 0d 0a ，原因是二進制情況下回車和換行的（類似文本方式的那種轉換）是不存在的
fclose(fp2);
fclose(fp4);

return 0;
}