c: int 十进制转二进制输出 dec to bin #c

dec to bin 3

/*
 * @Author: simonliu
 * @Date:   2018-04-25 21:48:58
 * @Last Modified by:   simonliu
 * @Last Modified time: 2018-04-25 22:24:15
 */
#define __Mylog__
#ifdef __Mylog__
#define Mylog(format,...) printf("File: " __FILE__ ", Line: %05d: " format "/n", __LINE__, ##__VA_ARGS__)
#else
#define Mylog(format,...)
#endif
#include <stdio.h>
#include "string.h"


void dec2bin(int num);

int main(void)
{ int decimalNum;
    
    printf("Enter number in decimal:");
    scanf("%d",&decimalNum);
     Mylog("\n Mylog enabled...\n");
     Mylog("\n Decimal%d:",decimalNum);
    printf("binary format is : \n");
    dec2bin(decimalNum);
    printf("\n");
    return 0;
}

void dec2bin(int num)
{
    int i = 0;
    int buffer[32];
    memset(buffer, 0, sizeof(buffer));
    Mylog("\n num= %d, ",num);
    if (num < 0)
    {
        num &= ~(1 << 31); //首位清0，后面按照正数操作
        buffer[31] = 1;    //首位记录为1

    }
    Mylog("\n new num= %d, ",num);
    while (num >0)
    {

        if (num&1)  //与00000001 按位&, 即检查最后一位是否为1
        {
        buffer[i] = 1;
        Mylog("   buffer[%d] = %d\n",i,buffer[i]);
        }
        else
        {
        buffer[i] = 0;
         Mylog("   buffer[%d] = %d\n",i,buffer[i]);
        }
        Mylog("\nnum= %d, ",num);
        Mylog("i= %d\n",i);
        num = num >> 1 ;
        i ++;
        
    }
    for (int i = 31; i>=0; i--)
    {
        printf("%d",buffer[i]);
        if (i%4 == 0)
            printf(" ");
        
    }
    
}