#how to derive a class

36 messages · Page 1 of 1 (latest)

restive pier
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I have a homework assignment that requires me to derive a class from another, but I never learned how to make classes work in the first place.

torn krakenBOT
#

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restive pier
#

the assignment is as follows

# 

class GradedActivity{
private:
double score;
public:
GradedActivity()
{score = 0.0;}
GradedActivity(double s)
{score = s;}
void setScore(double s)
{score = s;}
double getScore() const
{return score;}

char getLetterGrade() const;
};

char GradedActivity::getLetterGrade() const{
char letterGrade;

if (score > 89) {
letterGrade = 'A';
} else if (score > 79) {
letterGrade = 'B';
} else if (score > 69) {
letterGrade = 'C';
} else if (score > 59) {
letterGrade = 'D';
} else {
letterGrade = 'F';
}

return letterGrade;
}

The Essay class should determine the grade a student receives on an essay. The student's essay score can be up to 100, and is made up of four parts:


Grammar: up to 30 points

Spelling: up to 20 points

Correct length: up to 20 points

Content: up to 30 points



The Essay class should have a double member variable for each of these sections, as well as a mutator that sets the values of these variables. It should add all of these values to get the student's total score on an Essay.

Demonstrate your class in a program that prompts the user to input points received for grammar, spelling, length, and content, and then prints the numeric and letter grade received by the student.```
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i have the code working, but no classes

urban cedar
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you can create a class like class Essay { ... }; right?

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if you want to derive your new class called Essay from another class called GradedActivity, instead you type class Essay: public GradedActivity { ... };

restive pier
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i don't know how

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i had a terrible teacher my last semester

urban cedar
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did you teacher provide you like readings or videos or lectures or anything to learn this? 😅

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one thing we wont do here is do your entire homework assignment

restive pier
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no T-T

urban cedar
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but if you have any specific questions

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like "what does this part of a class mean"

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or "what does it mean to derive something from something else"

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we're here salute

restive pier
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my code works, but its not in the format the teacher wants

urban cedar
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uhh

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okay i guess you might want to post your code here

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specific questions are easier to answer

restive pier
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im trying to attatch it

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I got it!

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my computer hates me

urban cedar
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lets goo

restive pier
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like i said, accomplishes goal, but not the way the teacher wants

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brb, need to take dogs out

urban cedar
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classes have a lot of fancy names and weird parts, if you have zero knowledge on how classes work this might be tough to explain nicely

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if you want someone to walk you through your assignment you might want to check out #tutoring (or i guess you can just cross your fingers someone has the time to drop by and work it through)

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i recommend copying that GradedActivity class into your code and start writing some template Essay class

class Essay: public GradedActivity {
  ... variables that an essay has here ...

  .. Essay(...) constructors here ...

  ... void setXYZ() mutators here ...
}
restive pier
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it works

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but i have 22 errors :/

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changed a couple of thing, got down to 6, but have 7 messages

torn krakenBOT
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