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Hello, C++

C++ grew out of C, so almost all your C knowledge carries over. The first visible difference is output. Instead of printf, C++ uses streams:

#include <iostream>

int main() {
    std::cout << "Kills: " << 25 << "\n";
}

std::cout is the standard output stream.
<< sends things into it, left to right. No format specifiers needed: it knows the types.
std:: means these names live in the standard namespace.
In C++, main may skip return 0; (it's implied).

Your turn: print Rounds won: 13 using cout.