Check the length of integer variable

Question

Is there a way to check a length of an integer variable, and if is too long just trim it? I have a field in a database that accepts 3 characters. Length is 3.

So is it possible to do like it's done with string variable?

example:

cust_ref = cust_ref.Length > 20 ? cust_ref.Substring(0, 19) : cust_ref;

Thanks!

If you have a field in a database that is storing an integer, why is it a character-type field, not an integer? The lazy answer here would be "4 bytes; an int is always 4 bytes". — Marc Gravell
– Marc Gravell, Commented Jun 1, 2012 at 7:42

user4374312 · Accepted Answer · 2014-12-18 12:56:28Z

41

The easiest answer would be:

//The length would be 3 chars.    
public int myint = 111;
myint.ToString().Length;

answered Dec 18, 2014 at 12:56

user4374312

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Comments

Cliff · Accepted Answer · 2014-04-10 21:12:22Z

22

The following worked a treat for me!

public static int IntLength(int i)
{
  if (i < 0)
    throw new ArgumentOutOfRangeException();
  if (i == 0)
    return 1;
  return (int)Math.Floor(Math.Log10(i)) + 1;
}

Original Source: http://www.java2s.com/Code/CSharp/Data-Types/Getthedigitlengthofanintvalue.htm

answered Apr 10, 2014 at 21:12

Cliff

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2 Comments

Wilmer Over a year ago

var result = (int)Math.Floor(Math.Log10(Math.Abs(cust_ref)) + (cust_ref > 0 ? 1d : 2d))

roxton Over a year ago

With handling of 0, negative integers and int.MinValue: var result = cust_ref == 0 ? 1 : (int)Math.Floor(Math.Log10(Math.Abs((double)cust_ref))) + (cust_ref > 0 ? 1 : 2);

Guffa · Accepted Answer · 2012-06-01 07:14:46Z

5

You don't have to convert it to a string to make it shorter, that can be done numerically:

if (num > 999) {
  num %= 1000;
}

This will cut of digits from the left, if you want to cut them off from the right:

while (num > 999) {
  num /= 10;
}

If the value can be negative, also check:

if (num < -99) {
  num = -(-num % 100);
}

or:

while (num < -99) {
  num = -(-num / 10);
}

answered Jun 1, 2012 at 7:14

Guffa

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Comments

Romil Kumar Jain · Accepted Answer · 2012-06-01 07:04:17Z

1

cust_ref = cust_ref.ToString().Length > 20 ? Convert.ToInt32(cust_ref.ToString().Substring(0, 19)) : cust_ref;

or simply use

cust_ref = Convert.ToInt32(Convert.ToString(cust_ref).Substring(0, 19));

answered Jun 1, 2012 at 7:04

Romil Kumar Jain

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3 Comments

CrBruno Over a year ago

Ok I got it, the key is to convert a variable to string.. Thanks!

Guffa Over a year ago

The second version only works if the value always is at least 19 characters, otherwise you get an ArgumentOutOfRangeException.

Viacheslav Smityukh Over a year ago

int -> string -> string -> int :(

Rab Khan · Accepted Answer · 2012-06-01 07:04:31Z

1

Use like this

 cust_ref=   cust_ref.Tostring().Length > 20 ? Convert.ToInt32(cust_ref.ToString().Substring(0, 19)) : cust_ref;

answered Jun 1, 2012 at 7:04

Rab Khan

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1 Comment

Viacheslav Smityukh Over a year ago

This code will create 3 additional string instancies if it executes

Tigran · Accepted Answer · 2012-06-01 07:06:11Z

1

Nont very clear what you're asking for, but as much as I unerstood you're asking for:

int a = 1234567890;

for some reason you want to make it shorter, like

 int b = MakeShorter(a); 
    //b == 1234 (say)

If so, the easiest solution may be, convert it to string, made what you already implemented and reconvert it back to int.

If this is not what you're asking for, please clarify.

answered Jun 1, 2012 at 7:06

Tigran

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2 Comments

CrBruno Over a year ago

That it, if variable is to long I have to trim it, so first I have to convert it to string and then back to int?

Tigran Over a year ago

@CrBruno: In my opinion this is an easiest solution.

Viacheslav Smityukh · Accepted Answer · 2012-06-01 07:32:07Z

1

The conversion to the string is ugly way to implement it.

It's require a pure math solution

int CutTheNumber(int number, int maxLen)
{
  var maxSize = (int)Math.Pow(10, maxlen);
  if(maxSize <= Math.Abs(number))
  {
    number %= maxSize;
  }

  return number;
}

answered Jun 1, 2012 at 7:32

Viacheslav Smityukh

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8 Comments

Guffa Over a year ago

No it doesn't require a numerical solution.

Viacheslav Smityukh Over a year ago

I'm sorry but I don't understand you :(

Guffa Over a year ago

You said that it requires a pure math solution, but that's not true. Other solutions work as well, it's just a matter of taste.

Viacheslav Smityukh Over a year ago

You are right all of them are working but they aren't working well! The strings' processing is so cost, it's critical to lot of applications until you are writing CD-ejector.

Guffa Over a year ago

Then you should remove the costly floating point operation from your code. That would make it about ten times faster.

|

Md Kamruzzaman Sarker · Accepted Answer · 2012-06-01 07:14:53Z

0

Checking length

     length = cust_ref.ToString().Length;

Remove extra bits

       if (length > need)
       {
           cust_ref =Convert.ToInt32( cust_ref.ToString().Remove(length -(length- need)));
       }

edited Jun 1, 2012 at 7:14

answered Jun 1, 2012 at 7:08

Md Kamruzzaman Sarker

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Comments

Botz3000 · Accepted Answer · 2012-06-01 09:17:17Z

0

for this u will have to do some simple stuffs. like

cust_ref = Convert.ToInt32(Convert.ToString(cust_ref).Substring(0, 19));

or u can manually store it in any variable and the

edited Jun 1, 2012 at 9:17

Botz3000

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answered Jun 1, 2012 at 7:13

Saurabh Verma

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Comments

Snehal Thakkar · Accepted Answer · 2016-02-21 01:25:19Z

You can try this code. use if else statement to check the validation ..

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace avaragescore
{
    class Program
    {

        static void Main(string[] args)
        {
            float quiz;
            float midterm;
            float final;
            float avrg=0;
        Start:
            Console.WriteLine("Please enter the Quize Score here");
            quiz = float.Parse(Console.ReadLine());
            if(quiz > 100)
            {
                Console.WriteLine("You have entered wrong score please re-enter");
                goto Start;
            }
            Start1:
            Console.WriteLine("Please enter the Midterm Score here");
            midterm = float.Parse(Console.ReadLine());
            if(midterm > 100)
            {
                Console.WriteLine("You have entered wrong score please re- enter");
                goto Start1;
            }
            Start3:
            Console.WriteLine("Please enter the Final Score here");
            final = float.Parse(Console.ReadLine());
            if(final > 100)
            {
                Console.WriteLine("You have entered wrong Score Please re-enter");
                goto Start3;
            }
            avrg = (quiz + midterm + final) / 3;

            if(avrg >= 90)
            {
                Console.WriteLine("Your Score is {0} , You got A grade",avrg);
            }
            else if (avrg >= 70 && avrg < 90)
            {
                Console.WriteLine("Your Score is {0} , You got B grade", avrg);
            }
            else if (avrg >= 50 && avrg < 70)
            {
                Console.WriteLine("Your Score is {0} , You got C grade", avrg);
            }
            else if (avrg < 50)
            {
                Console.WriteLine("Yor Score is {0} , You are fail", avrg);
            }
            else
            {
                Console.WriteLine("You enter invalid Score");
            }
            Console.ReadLine();
        }
    }
}

When answering a question using code, it's good form to explain what the code is doing and why it answers the asker's question. Could you add some of that to your answer?

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