字符數組的翻轉



eg:將“student a am i”翻轉變爲"i am a student"

思路：將整個數組翻轉，再把每個單詞都翻轉過來就可以了

#define _CRT_SECURE_NO_WARNINGS 1

#include <stdio.h>
#include <assert.h>
//student a am i --> i am a student

void MyReverse(char* start, char* end)
{
	assert(start);
	assert(end);

	while (start < end)
	{
		char tmp = *start;
		*start = *end;
		*end = tmp;
		start++;
		end--;
	}
}
int MyStrlen(char arr[])
{
	int len = 0;
	char* tmp = arr;
	while (*tmp != '\0')
	{
		len++;
		tmp++;
	}
	return len;
}

void ReverseStr(char arr[])
{
	int len = MyStrlen(arr);
	char* start = arr;
	char* end = arr + len - 1;
	MyReverse(start, end);
	start = arr;
	end = arr;
	while (*end != '\0')
	{
		while (*end != ' ' && *end != '\0')
		{
			end++;
		}
		end--;
		MyReverse(start, end);
		if (*(end+1) == ' ')
		{
			MyReverse(start, end);
			start = end + 2;
			end = start;
		}
		else
		{
			end++;

		}

	}

}
void Test()
{
	char arr[] = "student a am i";
	ReverseStr(arr);
	//int len = Mystrlen(arr);
	//MyReverse(arr, arr+len-1);

	printf("%s\n", arr);
}

int main()
{
	Test();
	system("pause");
	return 0;
}

這樣就能達到題目的要求了！！！是不是很簡單呢