十进制转十六进制

int dectohex(int dec,int len,char s[])
{
    static char buf[256];
    char cell[] = "0123456789ABCDEF";
    int i = 0;
    int j=0;
    char ch;

    memset(buf, 0, 256);
    memset(buf, '0', len);

    while (dec != 0)
    {
        buf[i++] = cell[dec % 16];
        dec = dec / 16;
    }
    buf[i]='\0';
    i--;
    while (i>j)
    {
        ch=buf[j];
        buf[j]=buf[i];
        buf[i]=ch;
        i--;
        j++;
    }
    strcpy(s,buf);

    return 0;
}