1.13标准C库对文件操作引入

#include<stdio.h>
#include<string.h>



int main()
{

	//FILE *fopen(const char *path, const char *mode);//写入的路径；写入的模式

	FILE *fp;
	char *str = "chenlichen hen shuai";	
	char readBuf[128] = {0};

	fp = fopen("./chen.txt","w+");//*mode是指针，所以要用双引号“”

//	 size_t fwrite(const void *ptr, size_t size, size_t nmemb,FILE *stream);
	//				写入的是什么，写入的长度是多好，写入多少次，写进去哪里
	// ptr buf
	// size sizeof char
	//geshu
	//which file
	fwrite(str,sizeof(char),strlen(str),fp);
//	fwrite(str,sizeof(char)*strlen(str),1,fp);
//  上面的这两种写法都可以
	
//	int fseek(FILE *stream, long offset, int whence);
	fseek(fp,0,SEEK_SET);


//       size_t fread(void *ptr, size_t size, size_t nmemb, FILE *stream);

	fread(readBuf,sizeof(char),strlen(str),fp);	
	
	printf("read data: %s\n",readBuf);

	return 0;
}