Question

ZipCode.cpp第34行

我的编译器（MS Visual Studios 2013）给我错误：标识符“barCode”未定义。这是我的头文件ZipCode.h：

#ifndef _ZIPCODE_H
#define _ZIPCODE_H

#include <string>

class ZipCode {

private:
    std::string barCode;//The Bar Code
    void convDigit(int);//Converts a single digit to its bar code equivalent 
public:
    ZipCode(int);//Constructor recieving a zip code
    ZipCode(std::string);//Constructor recieving a bar code
    int getZipCode(void);//Returns the zip code
    std::string getBarCode(void);//Returns the bar code
};

#endif

源代码ZipCode.cpp：

#include "ZipCode.h"

#include <string>

ZipCode::ZipCode(std::string a){
    barCode = a;
}

ZipCode::ZipCode(int a){
    barCode = "";
    for (int b = 0; b < 5; b++){
        int digit = a % 10;
        a /= 10;
        convDigit(digit);
        }
}

void ZipCode::convDigit(int a){
    switch (a){
    case 0: barCode = std::string("11000") + barCode; break;
    case 1: barCode = std::string("00011") + barCode; break;
    case 2: barCode = std::string("00101") + barCode; break;
    case 3: barCode = std::string("00110") + barCode; break;
    case 4: barCode = std::string("01001") + barCode; break;
    case 5: barCode = std::string("01010") + barCode; break;
    case 6: barCode = std::string("01100") + barCode; break;
    case 7: barCode = std::string("10001") + barCode; break;
    case 8: barCode = std::string("10010") + barCode; break;
    case 9: barCode = std::string("10100") + barCode; break;
    }
}

std::string getBarCode(){
    return (barCode);//Error: identifier "barCode" is undefined
}

在前三个函数中我使用barCode并且没有问题，所以我很困惑为什么getBarCode（）现在有问题。我试过了：

return (ZipCode::barCode)//Error: member ZipCode::barCode is inaccessible.
return (this->barCode)//Error: 'this' may only be used inside a non-static member function.

上述两个错误也让我感到困惑，因为barCode和getBarCode都是ZipCode类的成员，而getBarCode不是静态函数。我还是编程新手（如果不是很明显），我对C ++也是新手。非常感谢任何帮助，谢谢。

Answer 1

与您定义的其他方法一样，它需要使用其所在类的名称进行限定，因此

std::string ZipCode::getBarCode() {

C ++错误：标识符“barCode”未定义

1 个答案: