C 语言文件操作（二）

绝地灬酷狼 2022-01-23 05:29 199阅读 0赞

一地址：[https://blog.csdn.net/qq\_21480607/article/details/90143303][https_blog.csdn.net_qq_21480607_article_details_90143303]  
一、相关函数及操作  
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二、代码

#include<stdio.h>
    #include<stdlib.h>
    #define LEN 15
    void main()
    {
    	FILE *fp;
    	char buffer[LEN],ch;
    	if(!(fp = fopen("stu.txt","at+")))
    	{
          printf("error");
    	  exit(1);
    	}
    	printf("Please imput a string:\n");
    //	scanf("%s",buffer);//遇空格回车自动结束
    	fgets(buffer,LEN,stdin);//stdin键盘
    	fputs(buffer,fp);
    	rewind(fp);
    	while(ch != EOF)
    	{
           putchar(ch);
    	   ch=fgetc(fp);
    	}
    	printf("\n");
    }
    /*void main()
    {
    	FILE *fp;
    	char buffer[LEN];
    	if(!(fp = fopen("stu.txt","rt")))
    	{
          printf("error");
    	  exit(1);
    	}
    	fgets(buffer,LEN,fp);
    	printf("%s\n",buffer);
    }*/

读文件

#include<stdio.h>
    #define SIZE 2
    struct student
    {
    	char name[10];
    	int num;
    	int age;
    	char addr[15];
    }stu[SIZE];
    void load();
    void main()
    {
    	int i;
    	load();
    	printf("name age\n ");
    	for(i=0;i<SIZE;i++)
    	{
    		printf("%s %d %d %s\n",stu[i].name,stu[i].num,stu[i].age,stu[i].addr);
    	}
    }
    void load()
    {
    	FILE *fp;
    	int i;
    	if( ! (fp= fopen("student","r")))
    	{
    		printf("Can not open the file !\n");
    		return;
    	}
    	for( i=0;i<SIZE;i++)
    	{
    		fread(&stu[i],sizeof(struct student),1,fp);	
    	}
    		fclose(fp);
    }

保存到文件

#include<stdio.h>
    #define SIZE 2
    struct student
    {
    	char name[10];
    	int num;
    	int age;
    	char addr[15];
    }stu[SIZE];
    void save()
    {
    	FILE *fp;
    	int i;
    	if( ! (fp= fopen("student.txt","w")))
    	{
    		printf("Can not open the file !\n");
    		return;
    	}
    	for( i=0;i<SIZE;i++)
    	{
    		if(fwrite(&stu[i],sizeof(struct student),1,fp)!=1)
    		{
    			printf("file write error");
    			fclose(fp);
    		}
    	}
    }
    void main()
    {
    	int i;
    	printf("请输入：");
    	for(i=0;i<SIZE;i++)
    	{
             scanf("%s%d%d%s",&stu[i].name,&stu[i].num,&stu[i].age,&stu[i].addr);
    	}
    	save();
    }

[https_blog.csdn.net_qq_21480607_article_details_90143303]: https://blog.csdn.net/qq_21480607/article/details/90143303
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