C语言十进制转二进制，并保存在数组中

﹏ヽ暗。殇╰゛Y 2022-05-18 05:21 170阅读 0赞

#include <stdio.h>
    #define uint unsigned int
    #define ushort unsigned short
    
    uint transform_data(uint frequence,ushort* pwm_table)
    {
    	uint temp = frequence;
    	int pwm_index = 0;
    	
    	while(temp)
    	{
    		pwm_table[pwm_index] = (temp&0x01);
    		temp = temp>>1;
    		pwm_index++;
    	}
    	return pwm_index;	
    }
    int main(){
    	uint frequence = 2;
    	//scanf("%d",&frequence);		
    	ushort pwm_table[15] = {0};
    	uint off_set;
    	
    	off_set = transform_data(frequence,pwm_table);
    	
    	int i=0;
    	for(i=off_set-1;i>=0;i--)
    	{
    		printf("%d",pwm_table[i]);
    	}			
    	return 0;
    }
    //输出结果：10

以前写的时候，总是想着要对2取余，再除2，今天看到别人写的程序，才想起来，直接取他的最低位，然后右移就是除2。(～o￣3￣)～

》————————————————————————————————————————————————《

上次写的只能转换正数，现在又把负数加上去了，感觉程序写的太繁琐了，有没有更简单的方法。

#include <stdio.h>
    #define uint unsigned int
    #define ushort unsigned short
    //求2的N次方  
    int cifang(int n)
    {
    	int i = 0,sum = 1;
    	for(i = n;i>0;i--)
    	{
    		sum *= 2;
    	}
    	return sum;
    }
    //十进制正数转换成二进制数 
    uint transform_data_zhengshu(uint frequence,ushort* pwm_table)
    {
    	uint temp = frequence;
    	int pwm_index = 0;
    	
    	while(temp)
    	{
    		pwm_table[pwm_index] = (temp&0x01);
    		temp = temp>>1;
    		pwm_index++;
    	}
    	return pwm_index-1;	
    }
    
    uint transform_data(int frequence,ushort* pwm_table)
    {
    	int temp = frequence;
    	int pwm_index = 0;
    	ushort pwm_temp[15]={0};
    	//负数	
    	if(frequence<0) 
    	{
    		//先将负数转换成正数 
    		temp = -frequence;
    		
    		//求出这个正数temp的二进制并存放在pwm_temp中	
    		transform_data_zhengshu(temp,pwm_temp);
    		
    		//将这个正数temp的二进制pwm_temp取反并转换成十进制数 sum 
    		int sum = 0;
    		int i = 0;
    		for(i = 0;i < 15;i++)
    		{
    			if(pwm_temp[i]==0)
    				pwm_temp[i]=1;
    			else
    				pwm_temp[i]=0;
    		
    			sum += cifang(i)*pwm_temp[i];			
    			pwm_temp[i] = 0;
    		}
    		
    		//将转换出来的十进制数sum加一 
    		sum += 1;
    		//printf("sum=%d\n",sum);
    		
    		//最后再转成二进制pwm_table
    		return transform_data_zhengshu(sum,pwm_table);		
    	}
    	
    	//正数 
    	return transform_data_zhengshu(frequence,pwm_table);					
    }
    
    int main(){
    	int frequence = -2;
    	//scanf("%d",&frequence);	
    	ushort pwm_table[15] = {0};
    	uint off_set;
    	
    	off_set = transform_data(frequence,pwm_table);
    	
    	int i=0;
    	for(i=off_set;i>=0;i--)
    	{
    		printf("%d",pwm_table[i]);
    	}
    	return 0;
    }