C++实现单词逆序输出

方法1

#include <iostream>
#include <string>

using namespace std;

string s;

void reverse(int begin,int end) {

while (begin < end) {
char temp = s[begin];
s[begin] = s[end];
s[end] = temp;
++begin;
--end;
}
}

int main()
{
getline(cin, s);

int len = s.length();

int begin = 0;

reverse(begin, len-1);

for (int i = 0; i < len; i++) {

if (s[i] != ' ') {
if (i > 0 && s[i - 1] == ' ') {
begin = i;
}
else if (i < len - 1 && s[i + 1] == ' ' || i == len - 1)
reverse(begin, i);
}
}
cout << s;
return 0;
}

方法2

#include<iostream>
#include<string>
#include<sstream>
#include<list>

using namespace std;

int main()
{
string line, word;
list<string> s1;
getline(cin, line);
istringstream stream(line);
while (stream >> word)
{
s1.push_front(word);
}
cout << endl;
for (list<string>::iterator it = s1.begin(); it != s1.end(); ++it)
{
cout << *it << " " << flush;
}
return 0;
}