悬赏100分！求高手帮忙改一道c\c++编程题！进来看！

pFileS = fopen("a.txt", "rb"); pFileD = fopen("aa.txt", "wb"); 这里 打开的文件 换一下pFileD = fopen("aa.txt", "wb"); 换成 pFileD = fopen("a.txt", "wb");