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Floating point exeption when running from Terminal but not Xcode

TommytheCat (4)
I have this pointless program that accepts an integer as a command line argument and uses a text file that lists a bunch of prime numbers to find the prime factorization of that number. I just made it to test out some concepts and it works when I run it from Xcode with the parameters set in the project, but when I run it from the terminal and enter the argument, I get a Floating Point exception. What would cause a program to run fine in the project but have that error in Terminal?

Edit: it may be that the file doesn't open primes.txt in terminal. Does anyone know how to get a separate file to open in a program while running from terminal?

Here's the code just in case:
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#include <iostream>
#include <fstream>
#include <cstdlib>

using namespace std;

class Factorization
{
public:
	Factorization();
	Factorization(int num);
	~Factorization();
	Factorization(const Factorization& f);
	
	Factorization& operator=(const Factorization& f);
	Factorization& operator=(int num);
	
	void printFactors() const;
	
private:
	int number;
	int* factors;
	int* times;
	int size;
};

Factorization::Factorization()
{
	int num;
	cout << "Enter a number: ";
	cin >> num;
	number = num;
	
	ifstream primes;
	primes.open("primes.txt");
	
	int factor;
	primes >> factor;
	
	factors = new int[number/2];
	times = new int[number/2];
	size = 0;
	while (factor <= number/2 && num != 1)
	{
		while (num%factor == 0)
		{
			if (times[size] == 0)
				factors[size] = factor;
			times[size]++;
			num /= factor;
			if (num%factor != 0)
				size++;
		}
		primes >> factor;
	}
	primes.close();
	if (number == num)
	{
		size = 1;
		factors[0] = number;
		times[0] = 1;
	}
}

Factorization::Factorization(int num)
{	
	number = num;
	
	ifstream primes;
	primes.open("primes.txt");
	
	int factor;
	primes >> factor;
	
	factors = new int[num/2];
	times = new int[num/2];
	size = 0;
	while (factor <= number/2 && num != 1)
	{
		while (num%factor == 0)
		{
			if (times[size] == 0)
				factors[size] = factor;
			times[size]++;
			num /= factor;
			if (num%factor != 0)
				size++;
		}
		primes >> factor;
	}
	primes.close();
	if (number == num)
	{
		size = 1;
		factors[0] = number;
		times[0] = 1;
	}
}

Factorization::Factorization(const Factorization& f)
{
	number = f.number;
	size = f.size;
	
	factors = new int[number/2];
	times = new int[number/2];
	copy(f.factors, f.factors + number/2, factors);
	copy(f.times, f.times + number/2, times);
	 
}

Factorization::~Factorization()
{
	delete[] factors;
	delete[] times;
}

Factorization& Factorization::operator=(const Factorization& f)
{
	number = f.number;
	size = f.size;
	copy(f.factors, f.factors + number/2, factors);
	copy(f.times, f.times + number/2, times);
	return *this;
}

Factorization& Factorization::operator=(int num)
{
	*this = Factorization(num);
	return *this;
}

void Factorization::printFactors() const
{
	cout << number << " = " << factors[0] << "^" << times[0];
	for (int i = 1; i < size; i++)
	{
		cout << " * " << factors[i] << "^" << times[i];
	}
	cout << "\n";
}	

int main (int argc, char* argv[])
{
	
	Factorization h(atoi(argv[1]));
	
	
	h.printFactors();
	
	Factorization g = h;//Testing out assignment operator
	
	g.printFactors();
	
	
	return 0;
}
Last edited on
PanGalactic (1658)
You should check if the file open succeeds in your constructors and throw an exception if it fails.
TommytheCat (4)
Yeah, I realized that the problem was that the file doesn't open. Does anyone know how to open a file when you run a program from Terminal? What directory do you have to put it in? Or do you have to enter the directory as a command line argument somehow?
PanGalactic (1658)
The way the program is written now, it reads the file from the current working directory. You can change the program to specify the full pathname to the file or you can launch the program from the directory that the file is in.
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