文件系统：读取，文件不存在则创建

 

#include<stdio.h>
#include<stdlib.h>
#define WAY "save.txt"
int main(int argc,int argv[])
{
    FILE *fp_read,*fp_write;
    
    fp_read=fopen(WAY,"r+");
    
    if(fp_read==NULL)
    {
        puts("Not exist,create now");
        fp_write=fopen(WAY,"w+");
        if(fp_write==NULL)
            puts("Create failed");
        else
        {
            puts("Create succeed");
            fputs("good\n",fp_write);            //写入文件：成功时返回非负值, 失败时返回EOF
            fflush(fp_write);                    //将缓存区内的数据存入文档
            fp_read=fp_write;
            fseek(fp_write, 0, SEEK_SET);        //将光标移动到文件结尾：SEEK_END，文件开头：SEEK_SET
            
        }
    }
    else
        puts("Open succeed");

    //打印文件内容
    rewind(fp_read);                    //将光标移动到文件开头
    int ch = 0;
    while((ch=fgetc(fp_read))!=EOF)
        putchar(ch);

    system("pause");


}