4_14练练手

//从键盘输入10个学生的有关数据，然后把它们转存到磁盘文件上去
/*#include <stdio.h>
#define SIZE 10
struct Student_type
{
	char name[10];
	int num;
	int age;
	char addr[15];
}stud[SIZE];								//定义全局结构体数组stud，包含10个学生数据

void save()
{
	FILE *fp;
	int i;
	if((fp = fopen("stu.dat","wb")) == NULL)
	{
		printf("cannot open file\n");
		return ;
	}
	for(i = 0; i < SIZE; i++)
		if(fwrite(&stud[i],sizeof(struct Student_type),1,fp) != 1)
			printf("file write error\n");
	fclose(fp);
}

int main()
{
	int i;
	printf("Please enter data of students:\n");
	for(i = 0; i < SIZE; i++)
		scanf("%s%d%d%s",stud[i].name,&stud[i].num,&stud[i].age,stud[i].addr);
	save();
	return 0;
}
/*#include <stdio.h>
#include <stdlib.h>
#define SIZE 10
struct Student_type
{
	char name[10];
	int num;
	int age;
	char addr[15];
}stud[SIZE];

int main()
{
	int i;
	FILE *fp;
	if((fp = fopen("stu.dat","rb")) == NULL)
	{
		printf("cannot open file\n");
		exit(0);
	}
	for(i = 0; i < SIZE; i++)
	{
		fread(&stud[i],sizeof(struct Student_type),1,fp);
		printf("%-10s %4d %4d %-15s\n",stud[i].name,stud[i].num,stud[i].age,stud[i].addr);
	}
	fclose(fp);
	return 0;
}*/
//有一个磁盘文件，内有一些信息，要求第一次将它的内容显示在屏幕上，第2次把它复制到另一个文件上
#include <stdio.h>
int main()
{
	FILE *fp1,*fp2;
	fp1 = fopen("file1.dat","r");
	fp2 = fopen("file2.dat","w");
	while(!feof(fp1)) 
		putchar(getc(fp1));			//逐个读入字符并输出到屏幕
	putchar(10);
	rewind(fp1);					//是文件位置标记返回文件头
	while(!feof(fp1)) 
		putc(getc(fp1),fp2);			//从文件头重新逐个读字符，输出到file2文件
	fclose(fp1);
	fclose(fp2);
	return 0;
}