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#include <iostream>
using namespace std;
 
class test{
	public:
	test(int a/* = 1*/) : a_(a) {}
	int get() const { return a_; }
	private:
	int a_;
};
 
 
int main() {
	test t;
	return 0;
}
 

prog.cpp: In function ‘int main()’:
prog.cpp:14:7: error: no matching function for call to ‘test::test()’
  test t;
       ^
prog.cpp:6:2: note: candidate: ‘test::test(int)’
  test(int a/* = 1*/) : a_(a) {}
  ^~~~
prog.cpp:6:2: note:   candidate expects 1 argument, 0 provided
prog.cpp:4:7: note: candidate: ‘constexpr test::test(const test&)’
 class test{
       ^~~~
prog.cpp:4:7: note:   candidate expects 1 argument, 0 provided
prog.cpp:4:7: note: candidate: ‘constexpr test::test(test&&)’
prog.cpp:4:7: note:   candidate expects 1 argument, 0 provided

Standard output is empty