how to convert decimal to binary

1public class DecimalToBinaryExample2{    
2public static void toBinary(int decimal){    
3     int binary[] = new int[40];    
4     int index = 0;    
5     while(decimal > 0){    
6       binary[index++] = decimal%2;    
7       decimal = decimal/2;    
8     }    
9     for(int i = index-1;i >= 0;i--){    
10       System.out.print(binary[i]);    
11     }    
12System.out.println();//new line  
13}    
14public static void main(String args[]){      
15System.out.println("Decimal of 10 is: ");  
16toBinary(10);    
17System.out.println("Decimal of 21 is: ");  
18toBinary(21);    
19System.out.println("Decimal of 31 is: ");    
20toBinary(31);  
21}}    

1#include <iostream>
2#include <stdlib.h>
3
4int main ()
5{
6    int i;
7    char buffer [33];
8    printf ("Enter a number: ");
9    scanf ("%d",&i);
10    itoa (i,buffer,10);
11    printf ("decimal: %s\n",buffer);
12    itoa (i,buffer,16);
13    printf ("hexadecimal: %s\n",buffer);
14    itoa (i,buffer,2);
15    printf ("binary: %s\n",buffer);
16    return 0;
17}
18

1# Python program to convert decimal to binary
2   
3# Function to convert Decimal number
4# to Binary number
5def decimalToBinary(n):
6    return bin(n).replace("0b", "")
7   
8# Driver code
9if __name__ == '__main__':
10    print(decimalToBinary(8))
11    print(decimalToBinary(18))
12    print(decimalToBinary(7))
13

1  std::string binary = std::bitset<8>(n).to_string();
2

1//Java Solution for Decimal To Binary Conversion
2
3import java.util.*;
4public class DecimalToBinary {
5
6	public static void main(String[] args) {
7		// TODO Auto-generated method stub
8		Scanner sc = new Scanner(System.in);
9		int dec = sc.nextInt();
10		StringBuffer sb = new StringBuffer();
11		while(dec!=0)
12		{
13			sb.append(dec%2);
14			dec=dec/2;
15		}
16		System.out.println(sb.reverse());
17		
18	}
19
20}
21

1def decimalToBinary(n):
2    return bin(n).replace("0b", "")
3   
4# Driver code
5if __name__ == '__main__':
6    print(decimalToBinary(8))
7    print(decimalToBinary(18))
8    print(decimalToBinary(7))