C++ I want to run my array thew my letter grade loop

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I have grades in array and I want the run them threw a letter grade I loop it so It can tell he how many A I got how many B I got and so on.

C++

void StatsList::PrintGradeCount()
{
	double gcount = 0;
	while (int j =! 1);
	{
		gcount = gcount + List[Listindex];
	
	
		



		if (gcount <= 100 && gcount >= 90) {
			cout << "A:" << gcount << endl;
		}
		else if (gcount <= 89 && gcount >= 80) {
			cout << "B:" << gcount << endl;
		}
		else if (gcount <= 79 && gcount >= 70) {
			cout << "C:" << gcount << endl;
		}
		else if (gcount <= 69 && gcount >= 60) {
			cout << "D:" << gcount << endl;
		}
		else if (gcount <= 59 && gcount >= 0) {
			cout << "F:" << gcount << endl;
		}
	}
	
	
	return;
}

What I have tried:

I had a for loop first then I tried while I think it's wrong but can some one help up.

Posted 13-Oct-16 7:33am

Member 12792145

Updated 13-Oct-16 15:29pm

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Comments

jeron1 13-Oct-16 13:44pm

I'm afraid

	while (int j =! 1);

isn't going to loop anything.

You're probably going to need separate variables for the A count, the B count, ...

Is double type really necessary?

Member 12792145 13-Oct-16 13:52pm

What I had first

for(int i = 0; i< Listindex; i++;){
    gcount = gcount + List[1]
    }

and I had it double because some of the variables in the array have decimals.

[no name] 13-Oct-16 14:00pm

j would never equal 1 and adding the values together from whatever List is, would never tell you how many A's you got. It will just tell you a total. Write what you want to do on a sheet of paper step by step and then turn that into code.

jeron1 13-Oct-16 14:01pm

for(int i = 0; i< Listindex; i++;){
    gcount = gcount + List[1]
    }

The last semi colon in the for statement is unnecessary.
The 'List[1]' should be 'List[i]'.

What is gcount supposed to represent? From what you have shown, gcount is a simple sum of all the grades, is this what you want?

Member 12792145 13-Oct-16 14:49pm

void StatsList::PrintGradeCount()
{
	
	for (int i = 0; i < Listindex; i++)
	{
		List[i];
		cout << "grade: ";
	
		if (i <= 100 && i >= 90) {
			cout << "A:" << i << endl;
		}
		else if (i <= 89 && i >= 80) {
			cout << "B:" << i << endl;
		}
		else if (i <= 79 && i >= 70) {
			cout << "C:" << i << endl;
		}
		else if (i <= 69 && i >= 60) {
			cout << "D:" << i << endl;
		}
		else if (i <= 59 && i >= 0) {
			cout << "F:" << i << endl;
		}
	}
	
	
	return ;
}

This is what I got now but this only counting the number of arrays not the elements in the array

[no name] 13-Oct-16 21:14pm

"counting the number of arrays", no it isn't and it's doing exactly what you told it to do. Take a deep breath, re-read your homework assignment, re-read what you have been told, and think about what it is that you are doing, then try again.

jeron1 13-Oct-16 15:23pm

What you've got now doesn't make much sense. I simply asked what was gcount supposed to represent. Maybe it's time to take a deep breath and put down into words what exactly you want to accomplish? What do entries in the List array (your input) represent and what is the expected output?

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Patrice T · Answer 1 · 2016-10-13T15:29:00

What you do looks rather confuse, use the debugger to see what your code is doing.

C++

        if (gcount <= 100 && gcount >= 90) {
    cout << "A:" << gcount << endl;
}
else if (gcount <= 89 && gcount >= 80) {
    cout << "B:" << gcount << endl;
}
else if (gcount <= 79 && gcount >= 70) {
    cout << "C:" << gcount << endl;
}
else if (gcount <= 69 && gcount >= 60) {
    cout << "D:" << gcount << endl;
}
else if (gcount <= 59 && gcount >= 0) {
    cout << "F:" << gcount << endl;
}

Independently from other bugs, your code fail when gcount is 89.5 or 69.2
The code can handle this case with simplifying because all the if and else if us a single structure that you need to learn.
assuming gcount is between 0 and 100:

C++

        if (gcount >= 90) {
    cout << "A:" << gcount << endl;
}
else if (gcount >= 80) {
    cout << "B:" << gcount << endl;
}
else if (gcount >= 70) {
    cout << "C:" << gcount << endl;
}
else if (gcount >= 60) {
    cout << "D:" << gcount << endl;
}
else if (gcount >= 0) {
    cout << "F:" << gcount << endl;
}

You should learn to use the debugger as soon as possible. Rather than guessing what your code is doing, It is time to see your code executing and ensuring that it does what you expect.

The debugger allow you to follow the execution line by line, inspect variables and you will see that there is a point where it stop doing what you expect.
Debugger - Wikipedia, the free encyclopedia[^]
Mastering Debugging in Visual Studio 2010 - A Beginner's Guide[^]

The debugger is here to show you what your code is doing and your task is to compare with what it should do.

Here is links to references books on C and C++ by the authors of the languages. Note than C is the ancestor of C++, so knowing C is always useful with C++.
The C Programming Language - Wikipedia, the free encyclopedia[^]
https://hassanolity.files.wordpress.com/2013/11/the_c_programming_language_2.pdf[^]
http://www.ime.usp.br/~pf/Kernighan-Ritchie/C-Programming-Ebook.pdf[^]

C++ Programing Language[^]