C++ FOR BEGINNERS (2025) - What is while loop, How to count digits of a number PROGRAMMING TUTORIAL

Iteration (looping) is a process where a set of instructions are repeated for a specified number of times or until a certain condition is met.
In a while loop, the condition is evaluated first and if it results as true then the statements inside while loop are executed, this happens repeatedly until the condition results as false. When the condition results as false, the control comes out of the loop and goes to the next statement in the program after the while loop.
In this video, I'm explaining how is while loop used on an example of counting digits of a number

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*******CODE IS IN THE COMMENTS*******

[CodeBeauty]

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Experience the power of practical learning, gain career-ready skills, and start building real applications!
This is a step-by-step course designed to take you from beginner to expert in no time!
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Use it quickly, because it will be available for a limited time.

#include <iostream>
using namespace std;

void main()
{
//Count digits of a number

int number;
cout << "Number: ";
cin >> number;

if (number == 0)
cout << "You have entered 0.\n";
else {
if (number < 0)
number = -1 * number;

int counter = 0;
while (number>0)//0
{
//number = number / 10;
number /= 10;
counter++;//3
}

cout << "Number contains " << counter << " digits\n";
}

system("pause>0");
}

[austinjohnathan]

I appreciate you making all of these. I've been learning C# for the last 6 or so months but recently discovered all of my comp sci classes will be using C++ exclusively. You making these videos will have a huge impact on getting up and running for my classes. As I said before, I really appreciate it. Please keep pumping these out!

[bubblesbaby]

C++ also has abs() which will return the absolute value of a number. You can do number = abs(number) and get the same result.

[virx]

For those that want to have greater than 10 Digits,

change your data type from int number to long long number.
I was able to get 19 digits from this data type.

[maysonsplay]

I wrote in order to include minus numbers too like that:
while (number > 0 || number < 0)
:) It works:)
Thank you for the lessons :) It helps me a lot :) I am still learning:) And I like your videos so much :D

[IAmIshanSaxena]

Yeah we need a video on debugging... and breakpoints

[saudalkhazriji]

Before i even start watching the video i give you a like cause i know the video is going to be amazing👏

[Lafsha]

i have exam soon, i am using your tutorials thanks for your videos this is so helpfull for me, Good luck<3

[noperson-ys]

A little different variation

int num;
int digit = 1;

cout << "Enter a number: ";
cin >> num;

if(num < 0) {

num = pow(num, 2);
num = sqrt(num);

}

while(num / 10 >= 1){
num/=10;
digit++;
}

cout << "Your number have " << digit << " digits";



Working properly!

[subratadas]

your explanation made understanding easy, thanks.

[hajarelsayed]

THANK YOU SO MUCH I NEEDED THIS SO BADLY

[benjaminavdic]

Pozdrav, obzirom da nisam bas za C++ svejedno se da nauciti a ucim vec druge programske jezike pa cu dati sansu da iskusam ovaj kanal. Dobila si novi sub

[domus_k]

Idk why but your voice is so therapeutic XD Thanks for teaching this, keep up the videos!!

[rianvankessel]

Yes make a video on debugging... and breakpoints, you're doing well.

[thomaspfaff]

a other way of solution is:
int number=0;
cout << "\nEnter a digit: "; cin >> number;
std::string s = std::to_string(number);
cout << "the length of the digit is: " << s.length();

[KanekiKen-glqo]

I really just changed
While(number>0)
To
While(number!=0)
And worked properly

[dandon.]

Thank you so much, you help me a lot .💙💙💙

[Lafsha]

16:27 you should write long long instead of int variable

[shamsyumar]

Hey I find your programming vedios the most easiest ones, thanks and I really need a mentor like you please be my guardian. I what to learn C++ programming lang.

[AlvinKazaz]

Dear Saldina, there is also another way to count digits beside 0 ->
while(number !=0) {

number /=10;
counter++;
}