Binary representation of numbers...

Hello everyone. I am trying to write a program in C++ and I need to represent a series of numbers in binary form. I need numbers as big as 1,000,000 and I was wondering if C++ has some sort of function to change base 10 numbers into binary numbers?

Thanks for the help in advance!

bitset is part of the Standard Template Library. You can use bitset for displaying numbers in binary. For input, you can use strtoul()

Here's a program I wrote a few months ago that "converts" between bases.

I created a program that converts ASCII characters into integers (base 10) and binary (base 2) numbers... it won't help you much, except for maybe the binary function... I was just playing around with recursion on this program...

Code:

---

/*
        Letter => Number => Binary

        This Program will take an ASCII character and convert it into a number, then
        convert it into Binary. The user may enter a single charater, or a string of
        any length, seeing as the program uses a loop to convert it one charater at a
        time.  The output is put into a file so it can easily be copied/pasted. The
        file is overwritten every time the program runs.

                Major_Small
*/

#include <iostream.h>
#include <fstream.h>

int power(int),binary(int&,int);

void main()
{
        char cha;
        int i,ch,cho;
        ofstream ofile("letnumbin.log",ios::trunc);

        cout<<"Press Enter after you entered a string or ASCII\n"
                <<"character to find The Decimal and Binary equivalent:\n\n";
        while(cin.get(cha))
        {
                if(cha!='\n')
                {
                        ch=int(cha);
                        cho=ch;        // assigns number to be sent to output file
                        cout<<cha<<'\t'<<ch<<'\t';
                        ofile<<cha<<'\t'<<ch<<'\t';
                        for(i=0;i<9;i++)
                        {
                                cout<<binary(ch,i);                // destroys int ch to 0 - cant be used ofile
                                ofile<<binary(cho,i);        // uses special assigned number
                        }
                        cout<<endl;
        ofile<<endl;
                }
        }
        cout<<endl;
}

int binary(int& ch,int i)
{
        if(ch>=power(8-i))
        {
                ch-=power(8-i);
                return 1;
        }
        else
          return 0;
}

int power(int exponent)
{
        if(exponent>0)
                return(2*power(exponent-1));
        else
                return 1;
}

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