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void Reverse(char s[])
{
    for(int i = 0, j = strlen(s) - 1; i < j; ++i, --j) {
        char c = s[i];
        s[i] = s[j];
        s[j] = c;
    }
}
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    a ^= b;
    b ^= a;
    a ^= b;
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ת×Ô£ºhttp://www.cnblogs.com/Mainz/articles/1164602.html
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char* strrev1(const char* str)
{
       int len = strlen(str);
       char* tmp = new char[len + 1];
        strcpy(tmp,str);
       for (int i = 0; i < len/2; ++i)
       {
          char c = tmp[i];
           tmp[i] = tmp[len – i - 1];
           tmp[len – i - 1] = c;
        }
       return tmp;
}
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char* strrev2(const char* str)
{
       char* tmp = new char[strlen(str) + 1];
        strcpy(tmp,str);
       char* ret = tmp;
       char* p =


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char *strcat (char *dst, const char *src)
{
  char *p = dst;
  while (*p)
    p++;
  while ((*p++ = *src++))
    ;
  return dst;
}
char *strncat (char *s1, const char *s2, long unsigned int n)
{
  char *dest = s1;
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