Question

How to set a default value to function parameters in C++

Answer 1

#include <iostream>

void f(int a = -1) {
    std::cout << a << std::endl;
}

int main() {
    f();
    f(30);
}


/*
run:

-1
30

*/

 

70+ SQL courses for beginners and professionals

Answer 2

#include <iostream>
#include <string>

void f(std::string country = "No Country") {
    std::cout << country << std::endl;
}

int main() {
    f();
    f("USA");
    f("Canada");
}


/*
run:

No Country
USA
Canada

*/

 

70+ SQL courses for beginners and professionals