c++怎么写怎么写！！求解

Question

Answer 1

#include <iostream>
using namespace std;
void func1( int a = 10,char c = '$')
{
    for (int i = 0; i < a; i++)
    {
        cout << c;
    }
    cout<<endl;
}
int main(int argc, char const *argv[])
{
    func1();
    func1(20,'#');
    func1(20);
}