当我编译我的代码时，我收到一条消息，这是什么意思

Question

当我编译代码时，收到以下错误消息。他们的意思是什么？我应该担心吗？如果是这样，我该如何解决这个问题？

/tmp/ccK2PEEC.o: In function 'main':
HW2Program.cpp:(.text+0x166): undefined reference to 'spitThemOut(familyFinance)'
collect2: error: ld returned 1 exit status

这是我的代码：

#include <iostream>
#include <iomanip>
#include <fstream>
    
using namespace std;

struct familyFinance{                     
    int acctNos; float Balance; familyFinance *nextNodePointer;
    familyFinance *ptrHead;  familyFinance *dynFinancePtr;
};
    
void spitThemOut(struct  familyFinance ); 
    
int main() {
    ifstream Lab3DataFileHandle;
     
    familyFinance *ptrHead=nullptr;
    familyFinance *dynFinancePtr=nullptr;
    familyFinance *tempPtr;
    tempPtr=ptrHead;
    
    Lab3DataFileHandle.open("Lab5Data.txt");
    while (!Lab3DataFileHandle.eof( )) {
        familyFinance *dynFinancePtr= new familyFinance;
    
        Lab3DataFileHandle >> dynFinancePtr->acctNos;
        Lab3DataFileHandle >> dynFinancePtr->Balance;
     
        familyFinance *nextNodePointer = nullptr;
        if (ptrHead == nullptr)  
            ptrHead = dynFinancePtr;
        else {      
            tempPtr =  ptrHead;  
            while  (tempPtr -> nextNodePointer != nullptr )
                tempPtr = tempPtr->nextNodePointer;
            tempPtr->nextNodePointer = dynFinancePtr; 
        }
    }
    Lab3DataFileHandle.close();
    
    spitThemOut ( *ptrHead);

    return 0;
}
         
void spitThemOut (struct  familyFinance *ptrHead) {
    cout << showpos;
    familyFinance *nextNodePointer;
    nextNodePointer = ptrHead;

    while (nextNodePointer) {
        cout << "Acct, Balance: " << setw(3)
             << nextNodePointer->acctNos << " " << nextNodePointer->Balance << endl;
    }
}

Answer 1

您的声明与定义不同。在声明参数应该是结构指针类型。

void spitThemOut(struct familyFinance * );

Answer 2

您的 function declaration 或 prototype 与您 function definition 不匹配。

你的prototype是这样的：

void spitThemOut(struct familyFinance );.

那么你的function definition是这样的：

void spitThemOut (struct familyFinance *ptrHead)

您需要将其更改为void spitThemOut(struct familyFinance* );。为了让链接器实现spitThemOut()函数。

当我编译我的代码时，我收到一条消息，这是什么意思

When I compile my code I get a message what does it mean

c++

pointers

linker-errors