C语言文件操作之文本文件读写

#include "stdio.h"
#include "stdlib.h"

#define PATH "c:\\demo.txt"
#define NewPATH "c:\\demonew.txt"
#define N 100
void mainx()
{
    char Arry[N]={0};
    FILE* Pfile=fopen(PATH,"r");
    if (Pfile==NULL)
    {
        printf("文件打开失败!");
    }
    while (fgets(Arry,N,Pfile)!=NULL);
    {
        printf("%s\n",Arry);
    }

     system("pause");



}



void main()
{
    char Arry[N]={0};
    FILE* Pfile=fopen(PATH,"r");
    FILE*Newpfile=fopen(NewPATH,"w+");
    if (Pfile==NULL||Newpfile==NULL)
    {
        printf("文件打开失败!\n");
    }
    fseek(Pfile,0,SEEK_END);
    int size=ftell(Pfile);

    printf("size=%d\n",size);
    fseek(Pfile,0,SEEK_SET);
    for (int i=0;i<size;i++)
    {
        char ch=fgetc(Pfile);
        printf("%c",ch);
        fputc(ch,Newpfile);
    }

    fclose(Pfile);
    Pfile=NULL;


     system("pause");



}