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52 lines (45 loc) · 696 Bytes
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Copy pathmain.cpp
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52 lines (45 loc) · 696 Bytes
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#include <string>
using std::string;
void Reverse(string::iterator begin, string::iterator end)
{
while (begin < end)
{
std::swap(*begin, *end);
++begin;
--end;
}
}
string ReverseSentence(string str)
{
if (str.length() > 0)
{
string::iterator begin = str.begin();
string::iterator end = str.end() - 1;
str.length();
Reverse(begin, end);
begin = end = str.begin();
while (begin != str.end())
{
if (*begin == ' ')
{
++begin;
++end;
}
else if (end == str.end() || *end == ' ')
{
Reverse(begin, --end);
begin = ++end;
}
else
{
++end;
}
}
}
return str;
}
int main()
{
ReverseSentence("I am a student.");
return 0;
}