Question

This C# program prints out a corresponding letter grade for a given mark. It uses a method (called MarktoGrade) to determine the letter grade. MarktoGrade takes one integer call by value formal parameter (called mark) and returns a char value that is the letter grade. All of the input and output (except an error message) is done in Main. There is one syntax error in this program that you will need to fix before it will compile (the error is in the line where the method is called).

using System;
public static class Lab3_1
{
    public static void Main()
    {
        // declare variables
        int inpMark;
        string lastName;
        char grade = ' '; 
 
        // enter the student's last name
        Console.Write("Enter the last name of the student => ");
        lastName = Console.ReadLine();
        // enter (and validate) the mark
        do {
            Console.Write("Enter a mark between 0 and 100 => ");
            inpMark = Convert.ToInt32(Console.ReadLine());
        } while (inpMark < 0 || inpMark > 100);

        // Use the method to convert the mark into a letter grade
        grade = MarkToGrade();

        // print out the results
        Console.WriteLine("{0}'s mark of {1} converts to a {2}", lastName,
                 inpMark, grade);
        Console.ReadLine();
    }

    // Method: MarkToGrade
    // Parameter
    //      mark: call by value parameter to be converted to a letter grade
    // Returns: the corresponding letter grade
    public static char MarkToGrade(int mark)
    {
        char letterValue;

        // multi-alternative If statement to determine letter grade
        if(mark > 0 && mark < 50)
            letterValue = 'F';
        else if(mark >= 50 && mark < 60)
            letterValue = 'D';
        else if(mark >= 60 && mark < 75)
            letterValue = 'C';
        else if(mark >= 75 && mark < 85)
            letterValue = 'B';
        else if(mark >= 85 && mark <= 100)
            letterValue = 'A';
        else 
        {
            Console.WriteLine("***Error - invalid mark");
            letterValue = 'X';
        }
        
        //return the letter grade back to Main 
        return letterValue;
    }
}

Run the program using input Smith and 98

What is the syntax error and how did you fix it?

What is the output?

Answer 1

Answer

 grade = MarkToGrade(); here is the error MarkToGrade take one int argument and here there is no argument.

using System;
public static class Lab3_1
{
    public static void Main()
    {
        // declare variables
        int inpMark;
        string lastName;
        char grade = ' '; 
 
        // enter the student's last name
        Console.Write("Enter the last name of the student => ");
        lastName = Console.ReadLine();
        // enter (and validate) the mark
        do {
            Console.Write("Enter a mark between 0 and 100 => ");
            inpMark = Convert.ToInt32(Console.ReadLine());
        } while (inpMark < 0 || inpMark > 100);

        // Use the method to convert the mark into a letter grade
        grade = MarkToGrade(inpMark);

        // print out the results
        Console.WriteLine("{0}'s mark of {1} converts to a {2}", lastName,
                 inpMark, grade);
        Console.ReadLine();
    }

    // Method: MarkToGrade
    // Parameter
    //      mark: call by value parameter to be converted to a letter grade
    // Returns: the corresponding letter grade
    public static char MarkToGrade(int mark)
    {
        char letterValue;

        // multi-alternative If statement to determine letter grade
        if(mark > 0 && mark < 50)
            letterValue = 'F';
        else if(mark >= 50 && mark < 60)
            letterValue = 'D';
        else if(mark >= 60 && mark < 75)
            letterValue = 'C';
        else if(mark >= 75 && mark < 85)
            letterValue = 'B';
        else if(mark >= 85 && mark <= 100)
            letterValue = 'A';
        else 
        {
            Console.WriteLine("***Error - invalid mark");
            letterValue = 'X';
        }
        
        //return the letter grade back to Main 
        return letterValue;
    }
}

output

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