This snippet has a will convert Decimal number to Binary number.

``````// coverts decimal to binary
// vishesh
// 21/05/2005

#include <iostream>

char* DEC_BIN(int);

int main()
{
//
int num;
std::cout << "Enter a number: ";
std::cin   >> num;
std::cout << DEC_BIN(num);
std::cin.get();
return 0;
}

char* DEC_BIN(int dec)
{
using namespace std;

char *rtn;

int prev, len, temp, *bin;

prev = dec;

for(int i=0;prev!=0;i++)
{
prev = prev/2;
len=i;
}

bin = new int[len+1];

prev = dec;

for(int i=0;prev!=0;i++)
{
bin[i] = prev%2;
prev = prev/2;
len=i;
}

bin[len+1] = prev%2;
len++;

for(int i=0;i<len/2;i++)
{
temp=bin[i];
bin[i]=bin[len-1-i];
bin[len-1-i]=temp;
}

rtn = new char[len+1];

for(int i=0;i<len;i++)
{
rtn[i]=bin[i]+'0';
rtn[i+1]='\0';
}

return rtn;
}``````

na na na lot of work :
works in C pretty well :

``````#include<stdio.h>
main()
{
int i=0,q,num,r[20];
printf("\n\n\nEnter Number\n\n\n");
scanf("%d",&num);
q = num/2;
r[0] = num%2;
while (q>1)
{
q = q/2;
r[i+1] = q%2;
printf("\n\n\n\nbinary is %s\n\n\n",r);
++i;
}
getch();
}
``````