下面的程序可以输出ASCII字符与所对应的数字的对照表。修改下列程序,使其可以输出字母a 到z与所对应的数字的对照表。

修改前

#include<iostream>
#include<cstring>
#include <iomanip>
using namespace std;
class Table
{
public:
    Table(int p)
    {
        i=p;
    }
    void ascii(  );
protected :
    int i;
};
void Table::ascii(  )
{
    int k=1;
    for (; i<127; i++)
    {
        cout<<setw(4)<<i<<" "<<(char)i;
        if ((k)%12==0)
            cout<<"\n";
        k++;
    }
    cout<<"\n";
}
class Der_table:public Table
{
public:
    Der_table(int p,char *m):Table(p)
    {
        c = new char[strlen(m) + 1];
        strcpy(c, m);
    }
    void print( );
protected:
    char *c;
};
void Der_table::print( )
{
    cout<<c<<"\n";
    Table::ascii();
}
int main()
{
    Der_table ob1(32,"ASCII value---char");
    ob1.print();
    return 0;
}
提示:修改后的main测试函数为:
int main()
{     Der_table ob('a','z',"ASCII value---char");
      ob.print();
      return 0;
}

修改后

#include<iostream>
#include<cmath>
#define _CRT_SECURE_NO_WARNINGS     //这个宏定义最好要放到.c文件的第一行
#pragma warning(disable:4996)

#include<cstring>
#include<string.h>
#include <iomanip>

using namespace std;
class Table
{
public:
    Table(char p, char q)
    {
        i = (int)p;
        j = (int)q;
    }
    void ascii();
protected:
    int i;
    int j;
};
void Table::ascii()
{
    int k = 1;
    for (; i <= j; i++)
    {
        cout << setw(4) << i << " " << (char)i;
        if ((k) % 12 == 0)
            cout << "\n";
        k++;
    }
    cout << "\n";
}
class Der_table :public Table
{
public:
    Der_table(char p, char q, const char* m) :Table(p, q)
    {
        c = new char[strlen(m) + 1];
        strcpy(c, m);
    }
    void print();
protected:
    char* c;
};
void Der_table::print()
{
    cout << c << "\n";
    Table::ascii();
}
//int main()
//{
//    Der_table ob1(32, "ASCII value---char");
//    ob1.print();
//    return 0;
//}
//提示:修改后的main测试函数为:
int main()
{
    Der_table ob('a', 'z', "ASCII value---char");
    ob.print();
    return 0;
}