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#include <iostream>
using namespace std;
constexpr double square(double x) { return x∗x; }
int main() {
	double a = 4.5;
	cout<<square(a)<<endl;
	// your code goes here
	return 0;
}

prog.cpp:3:45: error: stray ‘\342’ in program
 constexpr double square(double x) { return x∗x; }
                                             ^
prog.cpp:3:46: error: stray ‘\210’ in program
 constexpr double square(double x) { return x∗x; }
                                              ^
prog.cpp:3:47: error: stray ‘\227’ in program
 constexpr double square(double x) { return x∗x; }
                                               ^
prog.cpp: In function ‘constexpr double square(double)’:
prog.cpp:3:48: error: expected ‘;’ before ‘x’
 constexpr double square(double x) { return x∗x; }
                                                ^

Standard output is empty