c++ 基本文件操作的演示

#include <cstdlib>
#include <iostream>
#include <fstream>
using namespace std;
int getFileSize(ifstream *in){
    int size = 0;
    in->seekg(0,ios::end);    
    int endI = in->tellg();
    in->seekg(0,ios::beg);
    int beginI = in->tellg();
    size = endI - beginI;
    
    return size;
}
int main(int argc, char *argv[])
{
    
    ifstream fina;
    fina.open("test.txt");    
    fina.seekg(0,ios::end);
    int endI = fina.tellg();
    fina.seekg(0,ios::beg);
    int beginI = fina.tellg();
    int size = endI - beginI;
    //*/
    //int size = getFileSize(&fina);
    cout <<"file size: "<<size<<endl;
    if(fina.fail()){
      cout <<"fail"<<endl;
      return EXIT_SUCCESS;
    }else{
      cout <<"success"<<endl;
    }
    char ch[20];
    //fina.get(ch);
    fina >> ch;
    cout <<"get: "<<ch<<endl;
    fina.close();
    //
    ifstream *fp = new ifstream();
    fp->open("test.txt");
    size = getFileSize( fp );
    cout<<"fp size: "<<size<<endl;
    char buff[size];
    char tbch;
    int j = 0;
    while(!fp->eof()){
       
       fp->get(tbch);
       buff[j] = tbch;
       j++;
    }
    if(buff[59] == '\0'){
      cout <<"buff 有结尾符号"<<endl;
    }
    fp->close();
    
    ifstream finb;
    finb.open("test.txt");
    int MAX_LENGTH = 60;
    char line[MAX_LENGTH];
    while(finb.getline(line,MAX_LENGTH)){
       cout <<" "<<line<<endl;
    }
    finb.close();
    if(line[59] == '\0'){
      cout <<"有结尾符号"<<endl;
    }
    cout <<"B file size: "<<sizeof(line)<<endl;
    //
    ifstream finc;
    finc.open("test.txt");
    char text[100];
    char tempch;
    int i = 0;
    while(!finc.eof()){
       
       finc.get(tempch);
       text[i] = tempch;
       i++;
    }
    //text[i] = '\0';//这一句就不需要了 
    finc.close();
    cout <<"text:\n "<<text<<endl;
    
    ifstream fin( "test.txt" );
    ofstream fout( "results.txt", ios::app );
    char tch;
    fin >> tch;
    cout<<"tch: "<<tch<<endl;
    int temp;
    while( fin >> temp )
    //fin >> temp;
    cout<<"temp: "<<temp<<endl;
    fout << temp + 2 << endl;
    
    fin.close();
    fout.close();
    // 读取二进制文件
    //ofstream fout("file.dat", ios::binary 
    system("PAUSE");
    return EXIT_SUCCESS;
}