<span style="font-family:Microsoft YaHei;font-size:14px;">#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main(void)
{
	FILE * fp;
	FILE * fd;
	char buf[1024];

	fp=fopen("data1.txt","r");
	if(fp==NULL)
	{
		perror("open file");
		exit(0);
	}
    fd=fopen("data2.txt","w");
	if(fd==NULL)
	{
		perror("open file");
		exit(0);
	}
	
	while(fgets(buf,sizeof(buf),fp)!=NULL)
	{
		fputs(buf,fd);
		printf("%s", buf);
	}
	
    fclose(fd);
	fclose(fp);
	return 0;
}</span>