数组和模块

Array and module

本文关键字：模块 数组      更新时间：2023-10-16

您好，我正在开发一个程序，将用户输入的价格存储到数组中。 然后让一个模块接受价格数组并返回税款。 这是我到目前为止所拥有的。我的模块不断产生LNK2019。

#include <iostream>
using namespace std;
    double PrArray[20] = {}, total_price, tax_rate, price, tax;
    int i;
    double TAXOWED();
void main()
   {
    cout << "input the sales tax rate as a decimal ";
    cin >> tax_rate;
    cout << "nplease enter a price or 0 to quit ";
    i = 0;
    cin >> price;
    PrArray[i] = price;
    while (price > 0 && i < 19)
{
    i++;
    cout << "please enter a price or 0 to quit ";
    cin >> price;
    PrArray[i] = price;
}
for (i = 0; i < 19; i++)
{
    cout << "n";
    cout << PrArray[i];
}
TAXOWED();
system("PAUSE");
return;
}
double TAXOWED(double PrArray[], int i)
{
    double total_tax;
    for (i = 0; i < 19; i++)
{
    tax = tax_rate * PrArray[i];
    total_tax = tax;
}
    return(total_tax);
}

函数声明和定义不匹配

// Declaration
double TAXOWED();
// Definition
double TAXOWED(double PrArray[], int i);

所以本质上你是在声明一个函数，但从不定义它，然后在下面定义一个单独的函数。

根据您的注释，代码应如下所示：

#include <iostream>
using namespace std;
double TAXOWED(double price, double tax_rate)
{
    return tax_rate * price;
}
int main()
{
    double PrArray[20], total_tax[20], tax_rate, price;
    cout << "input the sales tax rate as a decimal ";
    cin >> tax_rate;
    cout << "nplease enter a price or 0 to quit ";
    cin >> price;
    if ( price == 0 )
        return -1;
    int i = 0;
    PrArray[i] = price;
    for (i = 1; i < 20; i++)
    {
        cout << "please enter a price or 0 to quit " ;
        cin >> price;
        PrArray[i] = price;
    }
    for (int i = 0 ; i < 20; i++)
        total_tax[i] = TAXOWED(PrArray[i], tax_rate);
    for (int i = 0; i < 20; i++)
        cout << "Tax for price #" << i << " : " << total_tax[i] << endl;
    system("PAUSE");
    return 0; 
}

此代码将允许您为每个价格设置tax_rate、每个price值和输出tax_rate。

好的，

这就是我现在所拥有的。 我需要最后的图表将所有总价加在一起 

#include <iostream>
using namespace std;
// declerations
double PrArray[20], total_tax[20], tax_rate, price, total_price;
int i;
double TAXOWED(double price, double tax_rate)
{
return tax_rate * price;
}
void main()
{
cout << "input the sales tax rate as a decimal ";
cin >> tax_rate;
cout << "nplease enter a price or 0 to quit ";
i = 0;
cin >> price;
PrArray[i] = price;
while (price > 0 && i < 19)
{
    i++;
    cout << "please enter a price or 0 to quit ";
    cin >> price;
    PrArray[i] = price;
}
for (int i = 0; i < 20; i++)
{
    total_tax[i] = TAXOWED(PrArray[i], tax_rate);
}
system("CLS");

cout << "                                   Prices";
cout << "ntaxrate % " << tax_rate;
cout << "nprices              tax             Total price ";
cout << "n__________________________________________________";
for (int i = 0; i < 20; i++)
{
    cout << "n" << PrArray[i] << "                   " << total_tax[i] << "                   " << PrArray[i] + total_tax[i];
}
for (int)
system("PAUSE");
return;

}

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