十进制转16进制 、十进制转二进制 函数

include "string.h"
include "stdio.h"
char *dectohex(int dec, int len)
{
  static char buf[256];
  char cell[] = "0123456789ABCDEF";
  int i = 0;
  memset(buf, 0, 256);
  memset(buf, '0', len);
  while (dec != 0)
  {
    buf[i++] = cell[dec % 16];
    dec = dec / 16;
  }
  strcat(buf, "x0");
  return (strrev(buf));
}
char *dectobin(int dec, int len)
{
  int i = 0;
  static char buf[256];
  memset(buf, 0, 256);
  memset(buf, '0', len);
  while (dec != 0)
  {
    buf[i++] = dec % 2+48;
    dec = dec / 2;
  }
  return strrev(buf);
}