Thread: Error LNK2019: unresolved external symbol

I've been searching for an hour and can't figure out what's wrong. I tried moving it to a new project, but that didn't fix it.

Here is the error message:
Lab09.cpp
InputNumber.obj : error LNK2019: unresolved external symbol "public: bool __thiscall InputNumber::valInput(void)" (?valInput@InputNumber@@QAE_NXZ) referenced in function "public: void __thiscall InputNumber::setNum(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >)" (?setNum@InputNumber@@QAEXV?$basic_string@DU?$char _traits@D@std@@V?$allocator@D@2@@std@@@Z)
C:\Users\Sarah\Desktop\Lab 9\Debug\Lab 9.exe : fatal error LNK1120: 1 unresolved externals

And here is my code (1 header and 2 .cpp):

Lab09.cpp

Code:

//Testing InputNumber
#include <iostream>
#include <string>
#include <cstring>
#include "InputNumber.h"
using namespace std;


int main()
{
    InputNumber num;
    
    cout << "Type a number: ";
    num.input();
    cout << "You typed " << num.getInString() << endl;
    
    if(num.validInputValue())
    {
        cout << "What you typed has numeric value " << num.getValue() << endl;
        cout << "Your number with commas is " << num.commaString() << endl;
    }
    else
        cout << "What you typed is not a valid numeric value. " << endl;
    return 0;
}

InputNumber.cpp

Code:

//Class implementation file
#include "InputNumber.h"


//Declaring and Initializing New Object
InputNumber::InputNumber()
{
    inString = "0";
    validInput = true;
    numValue = 0;
}


InputNumber::InputNumber(long newNumValue)
{
    setNum(newNumValue);
}


InputNumber::InputNumber(string newInString)
{
    setNum(newInString);
}




//Get Functions
long InputNumber::getValue()
{
    return numValue;
}


std::string InputNumber::getInString()
{
    return inString;
}


bool InputNumber::validInputValue()
{
    return validInput;
}




std::string InputNumber::commaString()
{
    if (validInput = true)
        {
            string comString = inString;
            int length = comString.length();


            int i = (comString.length() - 3);
            while (i > 0)
            {
                comString.insert(i, 1, ',');
                i = i - 3;
            }


            return comString;
        }
        
}


void InputNumber::input()
{
    string tempString;
    getline(cin, tempString);
    setNum(tempString);
}


void InputNumber::setNum(long newNum)
{
    numValue = newNum;


    validInput = true;


    char cInString[20];
    itoa(newNum, cInString, 0);
    inString = cInString;


    return;
}


void InputNumber::setNum(std::string strNum)
{
    inString = strNum;


    validInput = valInput();


    int size = inString.size();
    char cInString[20];
    strcpy(cInString, inString.c_str());
    numValue = atol(cInString);


    return;
}

InputNumber.h

Code:

//Class header file
#include <string>
#include <iostream>
using namespace std;
#ifndef INPUTNUMBER_H
#define INPUTNUMBER_H


class InputNumber
{


private:


    std::string inString;
    bool validInput;
    long numValue;
 
public:


    InputNumber();


    InputNumber(long);
      
    InputNumber(std::string);






    long getValue();
       
    std::string getInString();
 
    bool validInputValue();


    std::string commaString();


    void input();


    void setNum(long);


    void setNum(std::string);
    
    bool valInput();
};


#endif

Please help? This post has lots of views but no replies. I really need input.

I really need input.

Cannibalope = getchar();



Seriously, though, I don't know anything about C++, so I personally can hardly look at your code and see what's wrong. However, I do have something here I like to call the internet. I found a site talking about a similar linker error. I might be completely wrong, but shouldn't the "bool valInput()" function be defined in your "inputNumber.cpp" file?