C++ Tutorial/string/string reverse
Print characters read from keyboard in reverse order
<source lang="cpp">/* The following code example is taken from the book
* "The C++ Standard Library - A Tutorial and Reference" * by Nicolai M. Josuttis, Addison-Wesley, 1999 * * (C) Copyright Nicolai M. Josuttis 1999. * Permission to copy, use, modify, sell and distribute this software * is granted provided this copyright notice appears in all copies. * This software is provided "as is" without express or implied * warranty, and with no claim as to its suitability for any purpose. */
- include <iostream>
- include <string>
using namespace std; int main (int argc, char** argv) {
const string delims(" \t,.;");
string line;
// for every line read successfully
while (getline(cin,line)) {
string::size_type begIdx, endIdx;
// search beginning of the first word
begIdx = line.find_first_not_of(delims);
// while beginning of a word found
while (begIdx != string::npos) {
// search end of the actual word
endIdx = line.find_first_of (delims, begIdx);
if (endIdx == string::npos) {
// end of word is end of line
endIdx = line.length();
}
// print characters in reverse order
for (int i=endIdx-1; i>=static_cast<int>(begIdx); --i) {
cout << line[i];
}
cout << " ";
// search beginning of the next word
begIdx = line.find_first_not_of (delims, endIdx);
}
cout << endl;
}
}</source>
asdf; asdf; fdsa fdsa asdf fdsa asdf fdsa Terminate batch job (Y/N)? n
Reverse the order of all characters inside the string
<source lang="cpp">#include <string>
- include <iostream>
- include <algorithm>
using namespace std; int main() {
const string hello("Hello, how are you?");
string s(hello.begin(),hello.end());
// iterate through all of the characters
string::iterator pos;
for (pos = s.begin(); pos != s.end(); ++pos) {
cout << *pos;
}
cout << endl;
reverse (s.begin(), s.end());
cout << "reverse: " << s << endl;
}</source>
Hello, how are you? reverse: ?uoy era woh ,olleH
