從名稱空間調用方法 - 聲明標識符

Question

我之前問過關於此程序的問題，但仍有疑問。我在stdfax.h文件中創建了一個命名空間，並試圖從main調用函數。

#include "stdafx.h" 
#include <iostream> 
#include <iomanip> 

using namespace std; 

int main() 
{ 
    deductions::getData(mStatus, nOfChildren, salary, contribPension); 
    deductions::taxAmount(mStatus, nOfChildren, salary, contribPension); 
} 

的命名空間看起來是這樣的：

#pragma once 

#include <iostream> 
#include <iomanip> 

using namespace std; 

namespace deductions 
{ 
    const double marriedDeduction = 7000.00; 
    const double singleDeduction = 4000.00; 
    const double personalExemption = 1500.00; 

    void getData(char& mStatus, int& nOfChildren, double& salary, 
       double& contribPension) 
    {cout << "\n\n Enter marital status: m or M (married), s or S (single): "; 
    cin >> mStatus; 

    if(mStatus == 'm' || mStatus == 'M') 
    { 
     cout << " Number of children:" << setfill(' ') << setw(40) << ' '; 
     cin >> nOfChildren; 
    } // end IF 

    cout << setfill(' '); 
    cout << " Enter gross Salary:" << setw(40) << ' '; 
    cin >> salary; 
    cout << " Percentage of salary contributed to Pension (0 to 6):" << setw(6) << ' '; 
    cin >> contribPension; 
    cout << endl;} // end getData( 

    double taxAmount(char mStatus, int nOfChildren, double salary, 
      double contribPension)  
    {...} 
}; 

錯誤是主要的未申報的標識符。再一次，我試着擺弄它，不能讓它工作。對不起，如果這是一個愚蠢的錯誤;我正在與別人的代碼一起工作，我一直在看它，只要它沒有意義了。

在main中聲明變量會給出它們已經在stdfax中定義的錯誤。

Answer 1

請聲明在你的方法使用的標識符...

deductions::getData(mStatus, nOfChildren, salary, contribPension); 

Answer 2

您還沒有宣佈你作爲參數傳遞的變量：

int main() 
{ 
    deductions::getData(mStatus, nOfChildren, salary, contribPension); 
    deductions::taxAmount(mStatus, nOfChildren, salary, contribPension); 
} 

您必須聲明它們。例如：

int main() 
{ 
    char mStatus; 
    int nOfChildren; 
    double salary, contribPension; 
    deductions::getData(mStatus, nOfChildren, salary, contribPension); 
    deductions::taxAmount(mStatus, nOfChildren, salary, contribPension); 
}