给您一个句子，在C ++中逐字逆转字符串

Example:  
Input: "前开发者教程 is a good website",
Output: " website good a is 前开发者教程".

解决方法如下：

步骤1：颠倒整个字符串。

步骤2：颠倒字符串中的单个单词。

除了上述两个步骤，我们还需要删除前导和尾随空格以及单词之间的多余空格。

C ++解决方案

#include<iostream>
#include<string.h>
#include<algorithm>

using namespace std;

void reverseWords(string &str) 
{
	int start = 0;
	int i = 0;

	cout<<"\n\n============debugging logs start===========";
	//remove leading space
	while( str[i] == ' ') str.erase(i, 1);
	cout<<"\nStep 1 after removing leading space = "<<str<<endl;

	//reverse words
	reverse(str.begin(), str.end());
	cout<<"Step 2 after reversing the words = "<<str<<endl;

	//remove trailing zeros
	while( str[i] == ' ') str.erase(i, 1);
	cout<<"Step 3 after trailing zeros= "<<str<<endl;

	int size = str.size();

	for(i = 0; i < size - 1; i++)
	{
		//check if you encounter a space.
		// if you encounter a space, then it is a word, reverse the word.
		if( str[i] == ' ')
		{

			if( i == start )
			{
				// if there is more than 上 e space between two words, remove extra space
				str.erase(i--,1);
				size--;
				cout<<"Step 4 removing extra space between words = "<<str<<endl;

			}
			else
			{

				// reverse word.
				reverse(str.begin()+start, str.begin()+i);
				start = i+1;
				cout<<"Step 5 reversing single word = "<<str<<endl;

			}
		}
	}

// reverse the last word.
reverse(str.begin() + start, str.end());
cout<<"Step 6 reversing last word = "<<str<<endl;
cout<<"============debugging logs end===========\n\n"<<endl;


}

int main()
{
	string str = "  Hello    world   from    前开发者教程.com   ";
	cout<<"\nOriginal string = "<<endl;
	cout<<"\""<< str <<"\"";

	reverseWords(str);
	
	cout<<"String after reversing words = "<<endl;
	cout<<str<<endl;

	return 0;

}

输出：

Original string =

"  Hello    world   from    前开发者教程.com   "

============debugging logs start===========

Step 1 after removing leading space = Hello    world   from    前开发者教程.com

Step 2 after reversing the words =    moc.lairotutrepolevedorp    morf   dlrow    olleH

Step 3 after trailing zeros= moc.lairotutrepolevedorp    morf   dlrow    olleH

Step 5 reversing single word = 前开发者教程.com    morf   dlrow    olleH

Step 4 removing extra space between words = 前开发者教程.com   morf   dlrow    olleH

Step 4 removing extra space between words = 前开发者教程.com  morf   dlrow    olleH

Step 4 removing extra space between words = 前开发者教程.com morf   dlrow    olleH

Step 5 reversing single word = 前开发者教程.com from   dlrow    olleH

Step 4 removing extra space between words = 前开发者教程.com from  dlrow    olleH

Step 4 removing extra space between words = 前开发者教程.com from dlrow    olleH

Step 5 reversing single word = 前开发者教程.com from world    olleH

Step 4 removing extra space between words = 前开发者教程.com from world   olleH

Step 4 removing extra space between words = 前开发者教程.com from world  olleH

Step 4 removing extra space between words = 前开发者教程.com from world olleH

Step 6 reversing last word = 前开发者教程.com from world Hello

============debugging logs end===========


String after reversing words =

prodevelopertutorial.com from world Hello

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