Struggling with lnk2019

Question

I am attempting to compile an early version of a loan calculator for a project. However, I am getting an error I cannot understand. LNK2019 and LNK1120.

I am new at c++ and coding in general so hopefully this doesn't come across as a dumb question. I am coming from a intro to programming class in c not c++. I appreciate any help I can receive. I am using virtual studio 2022 community edition.

#include <fstream>
#include <string>
#include <iomanip>

using std::cout;
using std::endl;
using std::cin;



void welcome();
double getPrincipal();
double getTerm();
double getAnnualRate();
double convertRate();
double CalcPayment();
void DisplayResults(double, double, double, double);

int main()
{
    double loanPrincipal(0);
    double termLength(0);
    double annualIntRate(0);
    double monthlyIntRate(0);
    double MonPayment(0);

    welcome();
    loanPrincipal = getPrincipal();
    termLength = getTerm();
    annualIntRate = getAnnualRate();
    monthlyIntRate = convertRate();
    MonPayment = CalcPayment();
    DisplayResults(loanPrincipal, termLength, annualIntRate, MonPayment);

    return 0;
}



#include <iostream>
#include <string>
#include <iomanip>

//welcomes the user

void welcome()
{
    cout << "Welcome to the ammortization loan calculator" << endl;
    cout << "" << endl;
}

//asks the user for amount of loan

double getPrincipal()
{
    double userPrinicpal = 0;

    cout << "Please enter the loan ammount that you wish to borrow: " << endl;
    double userPrincipal;
    cin >> userPrincipal;

    return userPrincipal;
}

//asks the user for the annual interest rate

double getAnnualRate(double annualIntRate)
{
    cout << "Please enter the annual interest rate: " << endl;
    cin >> annualIntRate;

    return annualIntRate;
}

double convertRate(const double annualIntRate)
{
    double MonIntRate;
    MonIntRate = (annualIntRate / 100) / 12;

    return MonIntRate;
}

//asks the user for the length of the loan

void getTerm(int& termLength)
{
    cout << "Please enter the length of the loan (10, 15, or 30 years)" << endl;
    cin >> termLength;
}

//calculate monthly payment
double CalcPayment(double loanPrincipal, double monthlyIntRate, int termLength)
{
    double MonPayment = loanPrincipal * (monthlyIntRate * (1 + monthlyIntRate) * 180) / ((1 + 0.00375) * 180 - 1);

    return MonPayment;
}

//display results from previous calculations to the user
void DisplayResults(double loanPrincipal, double termLength, double annualIntRate, double MonPayment)
{
    cout << "Loan Application - Amortization Schedule" << endl;
    cout << "" << endl;
    cout << "Principal:                      " << loanPrincipal << endl;
    cout << "Life of Loan:                   " << termLength << endl;
    cout << "Annual interest rate:           " << annualIntRate << endl;
    cout << "Monthly Payment:                " << MonPayment << endl;
}

Error   LNK2019 unresolved external symbol "double __cdecl getTerm(void)" (?getTerm@@YANXZ) referenced in function main

Error   LNK2019 unresolved external symbol "double __cdecl getAnnualRate(void)" (?getAnnualRate@@YANXZ) referenced in function main

Error   LNK2019 unresolved external symbol "double __cdecl convertRate(void)" (?convertRate@@YANXZ) referenced in function

Error   LNK2019 unresolved external symbol "double __cdecl CalcPayment(void)" (?CalcPayment@@YANXZ) referenced in function

Error   LNK1120 4 unresolved externals

`double getTerm();` is a forward declaration of a function that has no arguments and returns a `double`. There's no definition of that function in this code. `void getTerm(int& termLength)` is a different function that accepts an `int` by reference and returns nothing. You need to decide which one is the right one and make the other one, and all calls to that function, match. Same with the rest. — Retired Ninja, Sep 02 '22 at 03:34

Struggling with lnk2019

0 Answers0