test string, C++ (clang)

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//clang 6.0.0

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

using namespace std;

int main()
{
    /*
    string s1("Hello");
    string s2("Hello", 3);
    string s3(s1, 2);
    string s4(s1, 2, 2);
    string s5(5, 'a');
    
    
    cout << s1 << endl;
    cout << s2 << endl;
    cout << s3 << endl;
    cout << s4 << endl;
    cout << s5 << endl;
    */
    
    /*
    string s1 = "goodbyte";
    cout << s1.size() <<" " << s1.length() << endl;
    cout << s1.capacity() << endl;
    s1.shrink_to_fit();
    cout << s1.capacity() << endl;
    s1.resize(3, 'x');
    cout << s1 << ":" << endl;
    */
    
    /*
    //string element access
    string s1 = "goodbye";
    
    s1.pop_back();
    s1.push_back('z');
    cout << s1 << endl;
    
    string s3(s1.begin(), s1.begin()+3);
    cout << s3 << endl;
    
    string s2 = "dragon land";
    s1.assign(s2);
    cout << s1 << endl;
    
    s1.append(" def");
    cout << s1 << endl;
    s1.insert(2, "mountain", 4);
    cout << s1 << endl;
    
    s1.replace(2, 5, s3, 1, 2);
    cout << s1 << endl;
    s1.erase(2, 2);
    cout << s1 << endl;
    cout << s1.data() << endl;
    
    s1.swap(s3);
    cout << s1 << endl;
    */
    
    /*
    // copy, find, compare
    string s1 = "abcdefg";
    char buf[20];
    size_t len = s1.copy(buf, 3, 2);
    cout << buf << " " << len << endl;
    
    s1 = "if a job is worth doing , it is worth doing well";
    size_t found = s1.find("doing");
    cout << found << endl;
    
    found = s1.find("doing", 20);
    cout << found << endl;
    
    found = s1.find_first_of("doing");
    found = s1.find_last_of("doing");
    cout << found << endl;   
    
    string s2 = "aest";
    s1.compare(s2); // if s1 > s2 return positive
    cout << s1.compare(s2) << endl;
    
    cout << s1 + s2 << endl;
    */
    
    /*
    //cout << to_string(2.3e7) << endl;
    
    string s1 = "190.9 monkey";
    int i = stoi(s1);
    cout << stoi(s1) << " " << stol(s1) << " " << stod(s1) << " " << stof(s1)  << endl;
    */
    
    /*
    string s1 = "variety is the spice of life.";
    int num = count(s1.begin(), s1.end(), 'e');
    cout << num << endl;
    num = count_if(s1.begin(), s1.end(), [](char c) { return c < 'e';});
    cout << num << endl;
    
    s1 = "goodness is better than beauty.";
    string::iterator itr = search_n(s1.begin(), s1.begin()+20, 2, 's');
    cout << itr - s1.begin() << endl;
    s1.erase(itr, itr+5);
    cout << s1 << endl;
    s1.replace (itr, itr+3, "good day");
    cout << s1 << endl;
    replace(s1.begin(), s1.end(), 'a', 'b');
    cout << s1 << endl;
    string s2 = "laskdfalsjfaslkfjaslfgjaslkdasldgasldgf";
    transform(s1.begin(), s1.end(), s2.begin(), [](char c) 
              {if (c < 'n') return 'a'; else return 'z';});
    cout << s2 << endl;
    
    s1 = "abcdefg";
    rotate(s1.begin(), s1.begin()+3, s1.end());
    cout << s1 << endl;
    */
    
    stringstream ss;
    ss << 89 << " Hex: " << hex << 89<< " Oct: " << oct << 89;
    cout << ss.str() << endl;
    
    int a, b, c;
    string s1;
    
    ss >> hex >> a;
    cout << a << endl;
    ss >> s1; 
    cout << s1 << endl;
    
    return 0;
}

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Compilation time: 0.82 sec, absolute running time: 0.17 sec, cpu time: 0.01 sec, memory peak: 5 Mb, absolute service time: 1,21 sec