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#include <iostream>
using namespace std;
 
double eneryForMass( double m , double c ){
double energy; 
energy = m*(c*c);
cout << "the energy value for object of mass" << m << "is" << energy; << endl;
}
	int main(){
//declare variables 
double m ; 
double c = 2.99792458;
 
 
 
 
cout << " please enter value for mass" ;
cin >> m; 
cout>> energyForMass();
 
return 0;
}
 

prog.cpp:7:71: error: expected expression
cout << "the energy value for object of mass" << m << "is" << energy; << endl;
                                                                      ^
prog.cpp:19:8: error: use of undeclared identifier 'energyForMass'
cout>> energyForMass();
       ^
2 errors generated.

Standard output is empty