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Old April 23rd, 2008, 07:19 AM
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Default About Functions and refinement in program

I need to have critical comments about the following piece of code. I am learning to write my own functions in C++. Could someone guide me on how to make this program more refined and how can i make practice on making my own functions:

//Function declaration to calculate percentage
float CalcPerc(float,float);

//Function declaration to calculate GPA
 float CalcGPA(float);

//Function declaration to calculate CGPA
float CalcCGPA(float,float,float);

//Function declaration to decide Grade
char CalcGrade(float);

      float TotMrks,MrksObt;
      float perc;
      float gpa;
      float gpa1,gpa2,gpa3;
      float cgpa;

      char grade;

      for (int subj=1;subj<=3;subj++)
        cout<<"\nPlease enter the total marks and marks obtained in Subject "<<subj;;

        cout<<"\nTotal Marks: ";

        cout<<"Marks Obtained: ";

        perc = CalcPerc(MrksObt,TotMrks) ;
        cout<<"Percentage: "<<perc<<" %"<<"\n";

      gpa = CalcGPA(perc);
      cout<<"GPA: "<<gpa<<"\n";

           switch (subj)
           case 1:

          case 2:


      cgpa = CalcCGPA(gpa1,gpa2,gpa3);
      cout<<"\n"<<"CGPA: "<<cgpa<<"\n";

      grade = CalcGrade(cgpa);
      cout<<"Grade: "<<grade<<"\n";


//Function for calculating percentage
float CalcPerc(float MO, float TM)
            return (MO/TM * 100);

//Function for calculating GPA
float CalcGPA(float percentage)
    return (percentage/100) * 5;

//Function for calculating CGPA
float CalcCGPA(float GPA1,float GPA2,float GPA3)
      return (GPA1 + GPA2 + GPA3)/3;

//Function for assigning grade
char CalcGrade(float CGPA)
     if (CGPA >= 4)
        return 'A';
     else if (CGPA >= 3 && CGPA < 4)
        return 'B';
     else if (CGPA >= 2 && CGPA < 3)
        return 'C';
     else if (CGPA >= 1 && CGPA < 2)
        return 'D';
     else if (CGPA < 1)
        return 'F';


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