[c][cpp]: decimal to binary

[c][cpp]:  decimal to binary

一、源码

 1 #include <stdio.h>
 2 #include <stdlib.h>
 3 #include <string.h>
 4 
 5 
 6 // decial to binary; 10 -> 2
 7 void dec2bin(long int num)
 8 {
 9     int final[1000];
10 
11     long int save_num = num;
12     
13     // calculate
14     int count = 0;
15     while ( num > 0 )
16     {
17         final[ count ] = num % 2 ;
18         num /= 2 ;
19         count++ ;
20     }
21 
22     // output
23     printf ( "\n dec2bin(decimal %ld) := ", save_num);
24 
25     while ( count >= 0 )
26     {
27         printf("%d", final[ count-- ] );
28     }
29     printf("\n");
30 }
31 
32 
33 void run()
34 {
35     dec2bin(0);
36     dec2bin(1);
37     dec2bin(2);
38     dec2bin(8);
39     dec2bin(1024);
40     dec2bin(65536);
41 }
42 
43 
44 int main()
45 {
46     run();
47     return 0;
48 }

二、运行

 1 g++ -std=c++20 -O2 -Wall main.cpp && ./a.out
 2 
 3 
 4  dec2bin(decimal 0) := 0
 5 
 6  dec2bin(decimal 1) := 01
 7 
 8  dec2bin(decimal 2) := 010
 9 
10  dec2bin(decimal 8) := 01000
11 
12  dec2bin(decimal 1024) := 010000000000
13 
14  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