C + + string inversion

Title, enter a string, invert the word according to the space,

Problem Description:

1, the word composition: No space characters form a word

2. The input string can contain leading and trailing spaces, but the inverted characters cannot be included.

3. There are multiple spaces between each word

Method: First extract each word, each reversal.

Code:

#include <string>

#include <vector>

String reverseString1 (string& str)
{
Std::string::size_type POS;
std::string result;
str + = ""; Extend strings for ease of operation, preventing no trailing spaces
int size = Str.size ();
string ret;
for (int i = 0; i < size; i++)
{
pos = Str.find (", i);
if (Pos < size && pos! = i)
{
std::string s = str.substr (i, pos-i);
Reverse (S.begin (), S.end ());
RET + = s + "";
i = pos;
}
}
Ret.erase (--ret.end ()); Remove the last extra space
return ret;
Test Result: Input:

std::string Test ("I have a little dog.");
Test = reverseString1 (test);

Output: Test = "I evah a elttil. God"

C + + string inversion