2个未解析的外部符号（C ++函数基础）

Question

We learned about functions in class this week and I have narrowed my code down to 1 error which is "2 unresolved external symbols", last time I had this error was because I declared my functions within main but I made sure not to make the same mistake this time.

Also, when trying to run the program it says that

'File Name' is not recognized as an internal or external command, operable program or batch file. I have turned on Not Using Precompiled Headers to no avail.

I have read numerous threads none of which helped, been working on this project for 7 hours now

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

int getDivisor();
int calcSquare(int number);
void findNumbers(int divisor, int number, int square);


int main()
{
    int divisor = 0;
    int square = 0;
    int number = 0;

        cout << "Enter a divisor: ";
        cin >> divisor;
        cout << "Here are the numbers from 0 to 100 that are evenly 
divisible by " << divisor << ",\nand their squares:\n\n";

        square = pow(number, 2);
        for (int count = 0; ++count;)
        {
            if (count >= 0 && count <= 100, count % divisor == 0)
            {
                int calcSquare(number);
                cout << number << setw(6) << square << endl;

                return square;
            }
        }
}

Answer 1

There were a lot of problems with your code, and your edits made them worse.

This is what I think you were trying to do:

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

int getDivisor();
int calcSquare(int divisor);
void findNumbers(int divisor);

int main()
{
    int divisor = getDivisor();
    findNumbers(divisor);
    return 0;
}

int getDivisor()
{
    int divisor = 0;
    cout << "Enter a divisor: ";
    cin >> divisor;
    return divisor;
}

int calcSquare(int divisor)
{
    return divisor * divisor;
}

void findNumbers(int divisor)
{
    cout << "Here are the numbers from 1 to 100 that are evenly divisible by " << divisor << ", and their squares : \n\n";
    for (int count = 1; count <= 100; ++count)
    {
        if (count % divisor == 0)
        {
            cout << count << setw(6) << calcSquare(count) << "\n";
        }
    }
}

Putting the function prototypes at the beginning of your program is fine, but you need to understand where and how you implement the functions OUTSIDE of your main function. As you said, this is the second time you've had this problem. I hope this helps you to avoid this issue in the future.