/// Вариант 2.
#include <iostream>
#include <string>
#include <cctype>
std::string strToUpper(std::string& str);
int main()
{
std::string i = "Don't WORRY be HAPPY.";
std::cout << strToUpper(i);
return 0;
}
std::string strToUpper(std::string& str)
{
for (auto &c : str)
c = toupper(c);
return str;
}
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