Working with std::string

Text in C++

#include <string>

string name = "Alice";
string greeting = "Hello, " + name + "!";
cout << greeting;           // Hello, Alice!
cout << name.length();      // 5

Useful String Methods

string s = "Hello, World!";
s.length()          // 13
s.substr(7, 5)      // "World"   (start index, length)
s.find("World")     // 7
s.find("xyz")       // string::npos  (not found)
s[0]                // 'H'
s.empty()           // false

Number <-> string conversion

string s = to_string(42);   // "42"
int n    = stoi("123");     // 123

Your Task

Write initials(string first, string last) that returns uppercase initials.
Example: initials("alice", "smith") → "A.S."