测试

测试2

#include <stdio.h>
/* 获取十六进制位数  */
int getHexNum(int num){
 int temp = num;
 int i=0;
 while(temp){
  temp/=16;
  i++;
  }
  
 return i;
 }
 
//输出十六进制指定位数 
void printHex(int value, int count){
 char temp[16] = {'0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f'};
 for(int i=count-1;i>=0;i--){
  printf("%c",temp[(value>>4*i)&0xf]);
  
  }
 
 }
//
int main(){
 int num = 0x0fffffff;
 printf("%x\n",num); 
 char temp[16] = {'0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f'};
printf("num=%d\n",getHexNum(num));

 printf("%c%c%c%c\n",temp[((num>>12)&0x0f)],
 temp[((num>>8)&0x0f)],
 temp[((num>>4)&0x0f)],
 temp[(num&0x0f)]);
 
 
 
 
 printHex(num,8);
 
 
 
 printf("\n");
 
 printf("%d\n",'A'-'a');
 
 
 for(int i=0;i<16;i++){
  printf("%c",'0'+i);
  }
 
 
 
 
 return 0;
 }