C语言实现文件复制

#include <stdio.h>
#include <stdlib.h>

int copyFile(const char* dest, const char* src)
{
	FILE* fin = fopen(dest, "r");
	FILE* fout = fopen(src, "w");

	if (fin && fout)
	{
		while (!feof(fin))//读到最后一个字符，feof（fin）仍未false
		{
			fputc(fgetc(fin), fout);
		}
		fclose(fin);
		fclose(fout);
		return 0;
	}
	return -1;
}

int main(int argc, char* argv[])
{
	if (argc > 2)
	{
		if (copyFile(argv[1], argv[2]) != 0)
			printf("文件复制失败\n");
		else
		{
			long long len;
			FILE *fp;
			fp = fopen(argv[1],"r");
			fseek(fp,0L,SEEK_END);
			len = ftell(fp);
			rewind(fp);
			printf("输入文件大小：%lld 字节\n",len);
			printf("文件内容:\n");
			while (!feof(fp))
			{
				putchar(fgetc(fp));
			}
			printf("\n");
			fclose(fp);



			fp = fopen(argv[2],"r");
			fseek(fp,0L,SEEK_END);
			len = ftell(fp);
			rewind(fp);
			printf("输出文件大小：%lld 字节\n",len);
			printf("文件内容:\n");
			while (!feof(fp))
			{
				putchar(fgetc(fp));
			}
			printf("\n");
			fclose(fp);
		}
	}
}

命令行：

copy.exe in.txt out.txt

注意out.txt读入了in.txt的文件结束标志EOF，使得两个文件的大小不一样！