guitsaru

The second project was due yesterday so I can write about it now. This project had two separate parts, approximating e^x by using the sum 1 + x + x^2/2! + x^3/3! + … + x^n/n!. The second part was a program that determines the number of servings of a type of food needed to maintain a person’s current weight based on calories used in a day. Neither of these are particularly exciting, so I’ll just show off some a little bit of the code.

bool repeat_program()
{
	bool valid = false;
	do
	{
		char repeat;
		cout << repeat;
		if(cin.fail())
		{
			cin.clear();
			cin.ignore(1000, 'n');
			valid = false;
		}
		else if(tolower(repeat) == 'y' )
		{
			valid = true;
			return true;
		}
		else if(tolower(repeat) == 'n' )
		{
			valid = true;
			return false;
		}
		else
		{
			valid = false;
		}
	}while(!valid);
}

This is pretty much exactly the same code that I used to repeat the program in my last project. Instead of cluttering up the main function, I decided to refactor it into it’s own function. I think that this makes the main function much less ugly and a lot easier to follow. I used this function in both parts of the project and will continue to use it in the future projects.

double get_positive_double(string prompt)
{
	double input;
	bool valid = false;
	do
	{
		cout  input;
		if(cin.fail())
		{
			cin.clear();
			cin.ignore(1000, 'n');
			valid = false;
			cout << "The input must be a number." << endl;
		}
		else if(input <= 0)
		{
			cout << "The input must be greater than 0." << endl;
			valid = false;
		}
		else
		{
			return input;
		}
	}while(!valid);
}

As I said in my last post, I revamped my input checking code in addition to putting it into it’s own function. Again, this serves to make the main function a lot less ugly and easier to follow. body_weight.cpp e.cpp