位运算之十进制转二进制 十六进制转二进制

#include <stdio.h>
#include <string.h>

int inttoBin(unsigned int num)
{
int i;
unsigned int mask = 0x80000000;
for(i = 0; i < 32; i++)
{
if((num & mask) == mask)
{
printf("1");
}

else
{
printf("0");
}

num = num << 1;

if((i + 1) % 4 ==0)
{
printf(" ");
}
}

printf("\n");
}

int inttoox(unsigned int num)
{
int i;
unsigned int temp = num;

char s[11];
memset(s,0,sizeof(char));

s[0] = "0";
s[1] = "x";
s[10] = "\0";

unsigned int mask = 0x0000000f;

for(i = 2; i < 10; i++)
{
if((temp & mask) > 10)
{
s[11-i] = (temp & mask) - 10 + 'a';
}
else
{
s[11-i] = (temp & mask) + '0';
}

temp = temp << 4;
}

printf("result = %s\n",s);
//printf("result = %s\n",s);
}

int main()
{
unsigned int num;
char s[11];

printf("intput a number\n");
scanf("%u",&num);

inttoBin(num);
inttoox(num);

return 0;
}