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#include <iostream>
using namespace std;
 
class sample
{
	protected:
	int a,b;
	public:
	void setvalue()
	{ a=25; b=40; }
 
	float mean(sample );
};
float mean(sample )
{
	return float(float a +b)/2.0;
}
int main() {
	sample x;
	x.setvalue();
	cout<<"mean vaue= "<<mean(x)<<"\n";
	// your code goes here
	return 0;
}

prog.cpp: In function ‘float mean(sample)’:
prog.cpp:16:9: error: expected primary-expression before ‘float’
  return float(float a +b)/2.0;
         ^
prog.cpp:16:9: error: expected ‘;’ before ‘float’
prog.cpp:16:9: error: expected primary-expression before ‘float’
prog.cpp:16:9: error: expected ‘;’ before ‘float’
prog.cpp:17:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^

Standard output is empty