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Converting integer to array

 
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Converting integer to array
janandrada
6 Jan, 2008 - 02:21 AM
Post #1

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How can i store integers digit by digit in an array element?

i have my code but i'm not able to find the error;
input is two integers and have to store in separate array
CODE

  int num1, num2, x;
  
    cout << "Type 2 integers seperated by space: ";
    cin>>num1>>num2;
    
    int count1 = 0;
    while (num1 > 0)
    {
        num1 = num1/10;
        count1++;
    }
    int count2 = 0;
    while (num2 > 0)
    {
        num2 = num2/10;
        count2++;
    }
    
    int array1[count1];
    int array2[count2];
    int elem = 0;
    
    for(int i=0;i<count1;i++){
            array1[elem++]=num1%10;
            num1=num1/10;
            }
            
    for(int i=0;i<count2;i++){
            array2[elem++]=num2%10;
            num2=num2/10;
            }
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Bench
RE: Converting Integer To Array
6 Jan, 2008 - 02:49 AM
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The easiest way would be to read it in as a string in the first place - then you have the advantage of the data already being in an array-like format.

You can then iterate through the string, and extract digits as needed to obtain the digits. converting from character values to integer values need be no more complicated than subtracting character zero '0'

CODE
#include <iostream>
#include <string>

int main()
{
    using namespace std;

    string str = "1234567";
    int num = str[2] - '0';

    cout << "Value of digit at position 2 is " << num;
}


There are also various neat tricks involving stringstream, which allow you to convert between string and numerical types.
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janandrada
RE: Converting Integer To Array
6 Jan, 2008 - 03:09 AM
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also, i have to add, multiply or subtract the the two array..

is it possible to use string?
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Amadeus
RE: Converting Integer To Array
6 Jan, 2008 - 04:39 AM
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Not really (well, using ASCII values), but you can easily convert the array elements to integers once they've been placed in an array.
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Bench
RE: Converting Integer To Array
6 Jan, 2008 - 03:25 PM
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Not directly, you must convert them first

CODE
#include <string>
#include <sstream>

bool to_int(const std::string& str, int& num)
{
    return std::stringstream( str ) >> num;
}

int main()
{
    std::string num("1234");
    int i;

    if( to_int( num, i ) )
    {
        //Converted successfully from string to int.
    }
}

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