function c++ how can i improve my code

Question

The C++ Marks need to entered in the CPP ( ) function, the Mathematics marks need to entered in the Mathematics ( ) function and the Physics marks need to be entered in the Physics ( ) function
Solve this problem by using Function with Parameters (not Global Variables). The output of the desired program is given below:
Please Enter Your C++ Marks:67
Your C++ Marks is:67
Please Enter Your Mathematics Marks:78
Your C++ Marks is:67
Your Mathematics Marks is:78
Your Average Marks is: 72.5
Please Enter Your Physics Marks:65
Your C++ Marks is:67
Your Mathematics Marks is:78
Your Physics Marks is:65
Your Average Marks is: 70.0
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using namespace std;
void CPP();
void Mathematics () ;
void Physics();
float CppMarks,mathsMarks, physicsMarks, averageCppMaths, AverageCppMathsPhysics;

CPP(float CppMarks)
{
cout<<"Please Enter Your C++ Marks: ";
cin>>CppMarks;
cout<<"Your C++ Marks is: "<<CppMarks<<endl;
}
Mathematics (float mathsMarks, float CppMarks )
{
cout<<"Please Enter Your Mathematics Marks: ";
cin>>mathsMarks;
cout<<"Your C++ Marks is: "<<CppMarks<<endl;
cout<<"Your Mathematics Marks is: "<<mathsMarks<<endl;
averageCppMaths=(mathsMarks+CppMarks)/2
cout<<"Your Average Marks is: "<<averageCppMaths<<endl;
Physics()
}
Mathematics (CppMarks,mathsMarks)

Physics()
{
cout<<"Please Enter Your Physics Marks: ";
cin<<physicsMarks;
cout<<"Your C++ Marks is: "<<CppMarks<<endl;
cout<<"Your Mathematics Marks is: "<<mathsMarks<<endl;
cout<<"Your Physics Marks is: "<<physicsMarks<<endl;
AverageCppMathsPhysics=(physicsMarks+mathsMarks+CppMarks)/3;
cout<<"Your Average Marks is: "<<AverageCppMathsPhysics<<endl;

}
int main(int argc, char** argv)
{
CPP();
Mathematics () ;
Physics();
}

Answer 1

I think you should use the "switch statements"