Functions - General Questions

What does [=] in a lambda capture list mean?

What will be the output of the program?

#include <iostream>
using namespace std;
void show(int x) { cout << "int"; }
void show(char x) { cout << "char"; }
int main() {
    show('a');
    cout << endl;
    return 0;
}

What will be the output of the program?

#include <iostream>
using namespace std;
int f(int a, int b = 10, int c = 100) { return a + b + c; }
int main() {
    cout << f(1) << " " << f(1, 2) << endl;
    return 0;
}

What will be the output of the program?

#include <iostream>
using namespace std;
int main() {
    int total = 0;
    auto add = [&total](int v) { total += v; };
    add(5); add(7);
    cout << total << endl;
    return 0;
}

Which is true about function overloading?