Reverse a string

Description: Reverse "C++ Rocks".

Hint:

• std::reverse is in <algorithm>. A string can also be built from rbegin() and rend().

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Solution

#include <algorithm>
#include <iostream>
#include <string>

int main() {
    std::string s = "C++ Rocks";

    std::string a;
    for (int i = static_cast<int>(s.size()) - 1; i >= 0; i--) a += s[i];

    std::string b = s;
    std::reverse(b.begin(), b.end());

    std::string c(s.rbegin(), s.rend());
    std::cout << a << '\n' << b << '\n' << c << '\n';
}

How it works

• The three ways give the same result. The library way is the shortest and the clearest.

Read C++ Strings.

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