//写数据到文件  
    ofstream fout("data.txt",ios::binary);  
    if (!fout)  
    {  
        cout<<"can not open file to write"<<endl;  
    }  
    for (int i=0;i<n;i++)  
    {  
        fout.write(reinterpret_cast<const char*>(&a[i]),sizeof(int));  
    }  
    fout.close();  
  
  
  
  
    //从文件中读取前100个数据并显示  
    ifstream fin;  
    fin.open("data.txt",ios::binary);  
    for (int i=0,num=0;i<100;i++)  
    {  
        fin.read(reinterpret_cast<char*>(&num),sizeof(int));  
        if (fin.eof())  
        {  
            break;  
        }  
        cout<<num<<" ";  
    }  
    fin.close();  

C++ 二进制文件读写,布布扣,bubuko.com

C++ 二进制文件读写