[c][cpp]: decimal to binary

[c][cpp]:  decimal to binary

 

 

 

 

一、源码

#include <stdio.h>


// decimal to binary;    10 -> 2
void dec2bin(long int num)
{
    int res[1000];

    long int save_num = num;

    // calculate
    int count = 0;
    while ( num > 0 )
    {
        res[ count++ ] = num % 2 ;
        num /= 2 ;
    }

    // output
    printf ( "\n dec2bin(decimal %ld) := ", save_num);
    while ( count >= 0 )
    {
        printf("%d", res[ count-- ] );
    }
    printf("\n");
}


void run()
{
    dec2bin(0);
    dec2bin(1);
    dec2bin(2);
    dec2bin(8);
    dec2bin(1024);
    dec2bin(65536);
}


int main()
{
    run();
    return 0;
}

 

 

 

二、运行

g++ -std=c++20 -O2 -Wall main.cpp && ./a.out


 dec2bin(decimal 0) := 0

 dec2bin(decimal 1) := 01

 dec2bin(decimal 2) := 010

 dec2bin(decimal 8) := 01000

 dec2bin(decimal 1024) := 010000000000

 dec2bin(decimal 65536) := 010000000000000000

 

 

 

三、参考文献

 

　　1、　　数字转二进制（4种方法） | 位域（位段）应用 —— 从内存中提取数字的二进制　　--　　https://blog.csdn.net/weixin_43919932/article/details/121854411