C: printf an integer to binary #c

int_to_bin

/*
* @Author: Norton-Linux内核研究
* @Date:   2018-04-25 19:41:08
* @Last Modified by:   simonliu
* @Last Modified time: 2018-04-25 19:41:27
* Source: https://blog.csdn.net/xzongyuan/article/details/29562371
*/

#include <stdio.h>
#include "string.h"

void decToBin(int num,char *buffer);
void supplement_zero(char *buffer);
void reOrder(char *buffer);
void printf_binary_byte(int num);


int main()
{ int decimalNum;
  int base=2;
  printf("Enter number in decimal:");
  scanf("%d",&decimalNum);
 // printf("Decimal%d:",decimalNum);
  printf("binary format is : ");
  printf_binary_byte(decimalNum);
  printf("\n");
  return 0;
}

void decToBin(int num, char *buffer)
{

	if(num>0)
	{
		decToBin(num/2,buffer+1);
		*buffer = (char)(num%2+48);
	}
}


void reOrder(char *buffer)
{
	int i;
	char temp[8]={0};
	for(i=0;i<4;i++)
	{
		temp[7-i]=*(buffer+i);
		*(buffer+i)=*(buffer+7-i);
		*(buffer+7-i)=temp[7-i];

	}

}

void supplement_zero(char *buffer)
{
	int i;
	int len = (int)strlen(buffer);
	//add '0' to buffer's blank data
	for(i=len;i<8;i++)
	{
		*(buffer+i) = '0';
	}
}

void printf_binary_byte(int num)
{
	int i;
	char buffer[8]={0};
	decToBin(num,buffer);
	supplement_zero(buffer);
	reOrder(buffer);
	printf("%8s",buffer);
}