C语言 int类型转换成二进制

深藏阁楼爱情的钟 2023-01-02 01:24 257阅读 0赞

使int n依次和2的次方进行与操作(&)，得知每个位是0还是1，并且写入字符数组，返回写有数字二进制信息的字符指针。

#include <stdio.h>
    #include <stdlib.h>
    
    char *toBinary(int num)
    {
        char *binary = (char *)malloc(sizeof(char) * 33);
        int flag = 1;
        int i;
    
        for (i = 31; i >= 0; i--)
        {
            if (num & flag)
            {
                binary[i] = '1';
            }
            else
            {
                binary[i] = '0';
            }
            flag<<=1;
        }
        binary[32] = '\0';
    
        return binary;
    }
    
    int main()
    {
        char *tmp;
        for (int i = -16; i <= 16; i++)
        {
            tmp = toBinary(i);
            printf("%d:\t%s\n", i, tmp);
            free(tmp);
            tmp = NULL;
        }
    
        return 0;
    }

#include<stdio.h>
    #include<stdlib.h>
    
    char* ToBin(int num)
    {
    	int flag=1;
    	char* result=(char*)malloc(sizeof(char)*33);
    	int i;
    
    	for(int i=31;i>=0;i--)
    	{
    		if(num & flag)
    		{
    			result[i]='1';
    		}
    		else
    		{
    			result[i]='0';
    		}
    		flag<<=1;
    	}
    	result[32]='\0';
    	return result;
    }
    
    int main()
    {
    	int a1=28;
    	int a2=-28;
    	char* a;
    	int i=0;
    	printf("%s","I am CDQ!\n\0");
    	a = ToBin(a1);
           //a= ToBin(a2);
    	printf("a1:");
    	for(int i=0;i<33;i++)
    	{
    		printf("%c",a[i]);
    	}
    	printf("%c",'\n');
    	free(a);
    	a = NULL;
    
    	return 0;
    }

I am CDQ!
    a1:00000000000000000000000000011100
    I am CDQ!
    a2:11111111111111111111111111100100

参考链接：[https://www.cnblogs.com/noonjuan/p/12343042.html][https_www.cnblogs.com_noonjuan_p_12343042.html]

[https_www.cnblogs.com_noonjuan_p_12343042.html]: https://www.cnblogs.com/noonjuan/p/12343042.html