I am sure we all know about number system, still I would like to explain about binary and decimal number system.

**Binary number :** It is base 2 number system which uses the digits from 0 and 1.

**Decimal number :** It is base 10 number system which uses the digits from 0 to 9

**Method 1: **Stored binary conversion in an array and print it.

#include<stdio.h>

int main()

{

long int decimal_num, remainder, quotient;

int binary_num[64], i = 1, j ;

printf(“Enter any decimal number:\n”);

scanf(“%ld”,&decimal_num);

quotient = decimal_num;

while(quotient!=0)

{

binary_num[i++]= quotient % 2;

quotient = quotient / 2;

}

/* Printing binary number equivqlent to given decimal number */

for(j = i -1; j> 0; j–)

printf(“%d”,binary_num[j]);

return 0;

}

**Method 2:** You may ask to convert a decimal number into a binary number using function recursion.

#include<stdio.h>

void generate_bits(long int num)

{

int binary_num;

if(num)

{

binary_num = num % 2;

generate_bits(num >>= 1);

printf(“%d”, binary_num);

}

}

int main()

{

long int decimal_num;

printf(“Enter any decimal number:\n”);

scanf(“%ld”, &decimal_num);

generate_bits(decimal_num);

return 0;

}