how to convert decimal to binary

[maHvic]

thanks for helping me...
im using c++ language...
how can you convert decimal to binary..
should i divide it? can you give me a hint for what code should i use...thanks

[Nick Evan]

The same way I showed you in your other thread, only now use an interger as input:

int a = 17;
std::cout << std::bitset<CHAR_BIT>( a ) << std::endl;

Will give 00010001 as output (17 binary)

[vmanes]

If you're looking to create a sequence of ones and zeros, you need to do some division and modulus operations.
Look here for some example of the process. You can do a 'net search and find many more examples.

[game036]

#include<iostream>
using namespace std;
int bin(int num);
int main()
{
    cout<<"Enter a binary number ";
    int num;
    cin>>num;
    cout<<endl<<endl;
    bin(num);
    cout<<endl<<endl;
    system("PAUSE");
    return 0;
}
int bin(int num)
{
    int a[25];
    int i;
    i=0;
    int r;
    int d;
    int b;
    int j;
    j= 0; 
    cout<<"Binary is : ";      
    while(num>0)
    {
          r=num%2;
          a[j]=r;
          d=num/2;
          b=num;
          num=d;
          j++;
    }    
    while(j>=0)
    {
              cout<<a[j];
              j--;
    }
}

[manish.ranjan]

Try dis.....

#include<iostream.h>
#include<malloc.h>
class d2b
{
 public:
int dec2bin(int *p)
{
 int a,b,c=1,d=0;
 while (*p!=0)
 {
  a = *p%2;
  b = a * c;
  d = d + b;
  *p = *p/2;
  c = c * 10;
 }
 return d;
}
};
void main()
{
 d2b db;
 int *n,x,y;
 n = (int*)malloc(sizeof(int));
 cout<<"Enter the decimal number: ";
 cin>>*n;
 y = *n;
 x = db.dec2bin(n);
 cout<<"The binary conversion of "<<y<<" is "<<x<<endl;
}

[raghuram1987]

#include<stdio.h>

int pow1(int,int);
void main(char* argv)
{   
    int i=0,n=0,j=0;
    int bin=0;
    printf("Enter a number \n");
    scanf("%d",&n);
    for(i=0;n>0;i++)
    {
        j=n%2;
        bin=bin+j * pow1(10,i);
        n/=2;       
    }
    printf("The binary number is %d \n",bin);
}

int pow1(int a , int b)
{
    int i=0;
    int sum=1;
    for(i=0;i<b;i++)
        sum*=a;

    return sum;
}

[kvprajapati]

Members,

Look at thread's start date. It was started on Dec 10th, 2007. Please do not resurrect old threads. By doing so you run the risk of confusing current posters.

Please read the rules before posting again - http://www.daniweb.com/forums/thread78223.html and rules.

Thread Closed.

[sami youssef]

int decimal,remender,sum=0,i=1;
cout<<"enter your integer and decimal number"<<endl;
cin>>decimal;
do{
    remender=decimal%2;
    sum=sum+(i*remender);
    decimal=decimal/2;
    i=i*10;
    }
    while(decimal>0)
    cout<<"the binary number is="<<sum<<endl;

[asifalizaman]

#include<iostream.h>
#include<conio.h>

class conversion
{
private:
  int n,i,p,q;
  int arr[23],ar[23],a[23];
public:


        void input()

    {
            cout<<"how many binary nos you want to enter?   ";
        cin>>n;
         cout<<endl<<endl;
         p=0;
         n--;
        for(i=n;i>=0;i--)
        {cout<<"enter binary no    ";
        cin>>arr[i];
         p++;}
    }


    void func()

      {
      n=1;
      for(i=0;i<=p;i++)
      {ar[i]=n;
      n=n*2;}



    }


      void output()

        {  p--;
        for(int j=0;j<=p;j++)
         {
         a[j]=arr[j]*ar[j];
            }
         q=0;
         for(int j=0;j<=p;j++)
         q=q+a[j];
         cout<<endl<<endl;
         cout<<"decimal conversion "<<q;
        }
};


    void main()

    {
        conversion c;
         c.input();
         c.func();
         c.output();

        getch();
    }

enjoys guys

[RonalBertogi]

template<class _T>
const char * dec2bin(_T dec)
{
    static char szret[65];
    int ch = sizeof(dec) * 8;
    memset(szret, 0, ch+1);
    char * ptr = szret;
    for( int i=0;i<ch;i++ )
        ptr[ch-1-i] = '0' + (dec >> i & 1);
    return ptr;
}

I've tried before posting this. dec2bin function accepts any integer (BYTE, short, long, __int64). Hope this helps.

[$Tweety$]

How bout dis???

#include<iostream.h>
#include<conio.h>
#include<math.h>
void main()
{
   clrscr();
   int a[200],i=0,dec,bin,j,k;
   cout<<"Enter the number:\n";
   cin>>dec;
   int quotient=dec;
   do
   {  a[i]=quotient%2;
      i++;
      quotient=quotient/2;

   }  while(quotient!=0);
   int strlen=i;
      cout<<endl;
   for(i=strlen-1;i>=0;i--)
   {  cout<<a[i];
   }
  getch();
}

[AndrisP]

#include <iostream>

int main () {
    int b,m,n;
    std::string s;
    std::cout<<"Input decimal number.\nInput \"0\" = end.\n\n";
    do  {
        std::cout<<"dec: ";
        std::cin>>n;
        m=n;
        std::cout <<"hex: "<< std::hex << n << '\n';
        std::cout <<"oct: " << std::oct << n << '\n';
        while(n>0){
            s+=(n%2)+48;
            n/=2;
            }
        std::cout<<"bin: ";
        while(s.size()>0){ std::cout<<s[(s.size()-1)]; s=s.substr(0,(s.size()-1)); }
        std::cout<<"\n\n";
        s="";
        }
    while(m>0);
    return 0;
    }