Module: Loop statement with condition - while


Problem

6/20

Number digits

Theory Click to read/hide

Let's try to write a program to solve the following problem: you need to enter a number and determine the number of digits in it.

Solution idea.
We just need to sequentially cut off the last digit from the number (this can be done by reducing the number by 10 times, using integer division by 10), and each time we need to increase the counter. 
As a result, after we cut off all the numbers, the counter will store the number of digits in the number.
In another way, the algorithm can be formulated as follows: while the number is not equal to zero, decrease it by 10 times and increase the counter by 1.

number (n) counter
123 0
12 1
1 2
0 3
The program will look like this: 
...
static void Main()
{
    int n = Convert.ToInt32(Console.ReadLine());
    int count = 0;
    while (n != 0)
    {
      count++;
      n = n / 10;
    }
}
You need to know and understand this program well, since many other tasks related to calculation by digits of a number.

Problem

Run the program. 
Look at the result of her work. Is everything okay in the output phrase? Think about how you can fix this flaw.

time 1000 ms
memory 32 Mb
Rules for program design and list of errors in automatic problem checking

Teacher commentary

Insert the missing code snippets
C#
1 
#include<iostream>
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using namespace std;
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main()  {
4 
int n, count;
5 
cin >> n;
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count = 0;
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while (n != 0)
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  {
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   count ++;
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   n = n / 10;
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  }
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cout << "Number - " <<n<< " contains " << count << " digits";
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}

     

Program check result

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