纠结的C++中类的问题!

[bcypxl]

#include<iostream>
using namespace std;

void SearchGood(char *,int &);

class InvoiceItem
{
private:
char *name;
int number;
float cost;
float Uprice;
float tax;
float saleroom;
float subtotal;
public:
InvoiceItem(char *n,float c)
{
name = new char [strlen(n)+1];
strcpy(name,n);
cost = c;
}
~InvoiceItem()
{
delete [] name;
}
void GetNum(char *n,int num)
{
strcpy(name,n);
number = num;
}
void GetUprice()
{
Uprice = cost + cost * 0.3;
}
void SetSubTotal()
{
subtotal = Uprice * number;
}
void SetSalesTax()
{
tax = subtotal * 0.06;
}
void SetSaleroom()
{
saleroom = subtotal + tax;
}
float GetSubTotal()
{
return subtotal;
}
float GetSalesTax()
{
return tax;
}
float GetSaleroom()
{
return saleroom;
}
};

int main()
{
InvoiceItem Price[5] = {InvoiceItem("鼠标",10),InvoiceItem("电脑",5000),
InvoiceItem("硬盘",300),InvoiceItem("光驱",500),
InvoiceItem("主板",200)};
char nm[10];
int num;
char choice;
int i;


do
{
cout << "用户购买的商品名称和数量:";
cin >> nm >> num;
SearchGood(nm,i);
Price[i].GetNum(nm,num);
Price[i].GetUprice();
Price[i].SetSubTotal();
Price[i].SetSalesTax();
Price[i].SetSaleroom();
cout << "显示小计:";
Price[i].GetSubTotal();
cout << endl;
cout << "显示零售税:";
Price[i].GetSalesTax();
cout << endl;
cout << "显示销售额:";
Price[i].GetSaleroom();
cout << endl;
cout << "你是否想再进行一次交易(输入Y或N):";
cin >> choice;
}while(toupper(choice) == 'Y');
return 0;
}

void SearchGood(char *m,int &i)
{
if(m == "鼠标")
i = 0;
else if(m == "电脑")
i = 1;
else if(m == "硬盘")
i = 2;
else if(m == "光驱")
i = 3;
else
i = 4;
}
为什么运行时不显示结果呢？

[yulinlang]

C风格字符串比较，请使用strcmp，另外没有输出自然不显示结果。

#include<iostream>
using namespace std;

void SearchGood(char *,int &);

class InvoiceItem
{
private:
    char *name;
    int number;
    float cost;
    float Uprice;
    float tax;
    float saleroom;
    float subtotal;
public:
    InvoiceItem(char *n,float c) {
        name = new char [strlen(n)+1];
        strcpy(name,n);
        cost = c;
    }
    ~InvoiceItem() {
        delete [] name;
    }
    void GetNum(char *n,int num) {
        strcpy(name,n);
        number = num;
    }
    void GetUprice() {
        Uprice = cost + cost * 0.3;
    }
    void SetSubTotal() {
        subtotal = Uprice * number;
    }
    void SetSalesTax() {
        tax = subtotal * 0.06;
    }
    void SetSaleroom() {
        saleroom = subtotal + tax;
    }
    float GetSubTotal() {
        return subtotal;
    }
    float GetSalesTax() {
        return tax;
    }
    float GetSaleroom() {
        return saleroom;
    }
};

int main()
{
    InvoiceItem Price[5] = {InvoiceItem("鼠标",10),InvoiceItem("电脑",5000),
                            InvoiceItem("硬盘",300),InvoiceItem("光驱",500),
                            InvoiceItem("主板",200)
                           };
    char nm[10];
    int num;
    char choice;
    int i;


    do {
        cout << "用户购买的商品名称和数量:";
        cin >> nm >> num;
        SearchGood(nm,i);
            cout << "i=" << i << endl;
        Price[i].GetNum(nm,num);
        Price[i].GetUprice();
        Price[i].SetSubTotal();
        Price[i].SetSalesTax();
        Price[i].SetSaleroom();
        cout << "显示小计:";
        cout << Price[i].GetSubTotal() << endl;
        cout << endl;
        cout << "显示零售税:";
        cout << Price[i].GetSalesTax() << endl;
        cout << endl;
        cout << "显示销售额:";
        cout << Price[i].GetSaleroom() << endl;
        cout << endl;
        cout << "你是否想再进行一次交易(输入Y或N):";
        cin >> choice;
    } while(toupper(choice) == 'Y');
    return 0;
}

void SearchGood(char *m,int &i)
{
    if(strcmp(m, "鼠标") == 0)
        i = 0;
    else if(strcmp(m, "电脑") == 0)
        i = 1;
    else if(strcmp(m, "硬盘") == 0)
        i = 2;
    else if(strcmp(m, "光驱") == 0)
        i = 3;
    else
        i = 4;

}

[1062]

name = new char [strlen(n)+1];
这里得到的strlen(n)只是char *的长度，一般只有4个字节长度，所以存不了你输入的信息

[1062]

纠正下，上面我的说法是错误的，用strlen可以返回正确的char *的长度（以'\0'结尾）