#include "iostream.h"
#include "fstream.h"
#include "string.h"
#define MAX 100
struct WORD
{
    char english[10];
    char chinese[20];
};
class dic
{
private:
    WORD word[MAX];
public:
    int n;
    dic();
    void input();
    void check();
    void show();
};

dic::dic()
{
    n=1;
}
void dic::input()
{
    cout<<"english:";
    cin>>word[n].english;
    cout<<"chinese:";
    cin>>word[n].chinese;
    ofstream file("dictionary.dat",ios::out|ios::app);
    file.write((char*)&word[n],sizeof(WORD));
    n++;
}
void dic::check()
{
    int j=1;
    bool isfind=false;
    char checkname[10];
    cout<<"checkname;";
    cin>>checkname;
    ifstream checkfile("dictionary.dat");
    if(!checkfile)cout<<"open error!";
    while(checkfile.read((char*)&word[j],sizeof(WORD)))
    {
        if(strcmp(checkname,word[j].english)==0)
        {
            cout<<"chinese:"<<word[j].chinese;
            isfind=true;
        }
        else j++;
    }
    if(!isfind)cout<<"没有找到!"<<endl;
}
void dic::show()
{
    int j=1;
    ifstream infile("dictionary.dat");
    if(!infile)cout<<"open error!"<<endl;
    while(infile.read((char*)&word[j],sizeof(WORD)))
    {
        cout<<word[j].english<<word[j].chinese<<endl;
        j++;
    }
}
void main()
{
    dic dictionary;
    int N,m=1;
    cout<<"...............字典..........................."<<endl;
    cout<<"1..............输入单词......................."<<endl;
    cout<<"2..............查找单词......................."<<endl;
    cout<<"3..............显示字典库....................."<<endl;
    cout<<"4..............退出..........................."<<endl;
    while(m)
    {
        cin>>N;
        switch(N)
        {
           case 1:  dictionary.input();break;
           case 2:  dictionary.check();break;
           case 4:  dictionary.show();break;
           case 5:  m=0;break;
        }
    }
}

编译的时候没有错误，但是运行的时候，当显示字典的时候没有显示。。。为什么啊，谢谢大家多多指点小弟啊

你的switch语句那里是1.2.4.5.改成1.2.3.4就行了吧
switch(N)
        {
           case 1:  dictionary.input();break;
           case 2:  dictionary.check();break;
           case 3:  dictionary.show();break;
           case 4:  m=0;break;
        }