对数组进行指定位置的翻转

	/*
	 * 对char数组从start到end位置进行翻转
	 */
	void reverse(char[] str,int start,int end){
		char temp;
		while(start<end){
			temp = str[start];
			str[start++] = str[end];
			str[end--] = temp;
		}	
	}