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

void main()
{
    clrscr();
    int binary[100], num, i=0, j;
    cout<<"Enter a decimal number: ";
    cin>>num;
    while (num>0) 
	{
        binary[i]=num%2;
        num=num/2;
        i++;
    }
    cout<<"The binary equivalent is ";
    for (j=i-1; j>=0; j--)
        cout<<binary[j];
    getch();
}

#include <iostream>
using namespace std;
     
int main()
{
    int num, i=0, j=0, x;
    cout<<"Enter a decimal number: ";
    cin>>num;
    x=num;
    while (x>0)
    {
        x=x/2;
		j++;	
	}
	int binary[j];
    while (num>0) 
	{
        binary[i]=num%2;
        num=num/2;
        i++;
    }
    cout<<"The binary equivalent is ";
    for (j=i-1; j>=0; j--)
        cout<<binary[j];
    return 0;
}