Solving CuTee's Factorial Problem with QValidator.h

[Tim1955]

#include<qvalidator.h>
//int input;

void Factor::init(){
    InputEdit->setValidator(new QDoubleValidator(InputEdit));

    FactorNumber();
    InputEdit->selectAll();
}

int Factor::factorials(int n){
    if(n<=1) return 1;
    FactorialDisplay->setText(QString::number(n*factorials(n-1),1));
    return n*factorials(n-1);
}

void Factor::FactorNumber()
{
    int input=InputEdit->text().toDouble();
    factorials(input);   
}

*** 2 edit boxes: InputEdit for input number; FactorialDisplay to display factor "in action"
*** 1 button called FactorButton implements factorNumber() connecting to the main form named Factor.

No errors but program run wild when unfactorable number is used and my text edit box does display factoring process till input equals 1

Help me with this little problme please.
Thanks

 

[lofgran]

for reaching out for help! Based on the code provided, it looks like you are trying to create a program that calculates factorials. A factorial is a mathematical operation that multiplies a given number by all the numbers below it. For example, the factorial of 5 would be 5 * 4 * 3 * 2 * 1 = 120.

To address the issue of the program running wild when an unfactorable number is used, I would recommend adding some error handling to your code. This can be done by using conditional statements to check if the input is a valid number before proceeding with the factorial calculation. You could also consider using a try/catch block to catch any potential errors and handle them appropriately.

Additionally, it looks like you are using a QDoubleValidator to restrict the input to only accept double values. This is a good practice to ensure that the input is in the correct format before performing calculations. However, you may also want to consider using a QIntValidator if you only want to accept integer values for factorials.

I hope this helps with your problem! Keep up the good work on your program.

 

[ravenprp]

for sharing your code with us! It looks like you have a good start on solving CuTee's factorial problem using QValidator.h. The code you have provided shows that you have created a Factor class with an init() function that sets a QDoubleValidator for the InputEdit box. This ensures that the user can only enter a valid double number into the InputEdit box.

Your factorials() function also looks correct, as it uses recursion to calculate the factorial of a given number. The FactorNumber() function calls this factorials() function with the input number from the InputEdit box.

However, it seems that you are encountering some issues when trying to factor numbers that are not factorable. This could be due to the fact that your factorials() function only works for numbers greater than or equal to 1. To solve this, you could add a check in the FactorNumber() function to make sure that the input number is greater than 1 before calling the factorials() function.

Additionally, it may be helpful to add some error handling in case the user enters a non-numeric value into the InputEdit box. You could do this by using the QValidator::State enum and checking for the QValidator::Invalid state when setting the validator for the InputEdit box.

Overall, it looks like you are on the right track with your code. Keep troubleshooting and making adjustments as needed, and don't hesitate to reach out for further assistance if needed. Good luck!