学步园

今天下午看了下各公司的面试。终于知道高质量是多么的重要，回想以前写东西真是糟乱啊。

1.while((*dest++) = (*sc++));

2.char *my_itoa(int num,char *str,int radix)
{
 const char table[]="0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
 char *ptr = str;
 bool negative = false;
 if(num == 0){ //num=0
  *ptr++='0';
  *ptr='/0'; // don`t forget the end of the string is '/0'!!!!!!!!!
  return str;
 }
 if(num<0){ //if num is negative ,the add '-'and change num to positive
  *ptr++='-';
  num*=-1;
  negative = true;
 }
 while(num){
  *ptr++ = table[num%radix];
  num/=radix;
 }
 *ptr = '/0'; //if num is negative ,the add '-'and change num to positive
 // in the below, we have to converse the string
 char *start =(negative?str+1:str); //now start points the head of the string
 ptr--; //now prt points the end of the string
 while(start<ptr){
  char temp = *start;
  *start = *ptr;
  *ptr = temp;
  start++;
  ptr--;
  }
 return str;
}