Chart!

This is a discussion on Chart! within the C Programming forums, part of the General Programming Boards category; I'm making a program that lets the user enter a bunch of info, like student grades for example... then the ...

  1. #1
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    Chart!

    I'm making a program that lets the user enter a bunch of info, like student grades for example... then the program will produce a chart using the entered data.


    Chart should look like this:

    Number of
    Students
    10 |
    9 |
    8 |
    7 |
    6 |
    5 |
    4 | *
    3 |
    2 | *
    1 | * * *
    0 | *
    -----------------------------------------------------------
    0 1 2 3 4 5 6 7 8 9 10

    Whats the best way of getting the *'s in the chart??
    Last edited by 98dodgeneondohc; 04-21-2005 at 11:12 AM.

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    Good to know. Did you have a question, or was your intent to simply inform us of your programming adventures?

    [edit]
    Quote Originally Posted by 98dodgeneondohc
    Whats the best way of getting the *'s in the chart??
    printf with a for loop?
    Last edited by pianorain; 04-21-2005 at 11:16 AM.
    If I did your homework for you, then you might pass your class without learning how to write a program like this. Then you might graduate and get your degree without learning how to write a program like this. You might become a professional programmer without knowing how to write a program like this. Someday you might work on a project with me without knowing how to write a program like this. Then I would have to do you serious bodily harm. - Jack Klein

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    Quote Originally Posted by pianorain
    Good to know. Did you have a question, or was your intent to simply inform us of your programming adventures?
    lol! sorry man.. I accidentally pressed enter half way through the post before posting the question.

  4. #4
    and the hat of wrongness Salem's Avatar
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    > Whats the best way of getting the *'s in the chart??
    Code:
    putchar( '*' );
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
    I support http://www.ukip.org/ as the first necessary step to a free Europe.

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    Quote Originally Posted by 98dodgeneondohc
    lol! sorry man.. I accidentally pressed enter half way through the post before posting the question.
    Heh...aye. It would help if you posted some code demonstrating your attempt. Otherwise, we can't really help.
    If I did your homework for you, then you might pass your class without learning how to write a program like this. Then you might graduate and get your degree without learning how to write a program like this. You might become a professional programmer without knowing how to write a program like this. Someday you might work on a project with me without knowing how to write a program like this. Then I would have to do you serious bodily harm. - Jack Klein

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    I see the Y axis is the number of students, but what's the X axis of the chart?
    If you understand what you're doing, you're not learning anything.

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    and the Hat of Clumsiness GanglyLamb's Avatar
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    Quote Originally Posted by itsme86
    I see the Y axis is the number of students, but what's the X axis of the chart?
    The grades probably going from 0 to 10 .

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    how will it know where to put the *'s based on what the user enters??? .... X is number of students and Y is marks by the way

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    Registered User caroundw5h's Avatar
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    There is a post regarding your question on the board as well. A quick search should help you out on how to get started.

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    Quote Originally Posted by GanglyLamb
    The grades probably going from 0 to 10 .
    Probably. But I've learned not to make assumptions from peoples' questions on here For instance, maybe it's percentage of wrong or right answers divided by 10. Who knows?
    If you understand what you're doing, you're not learning anything.

  11. #11
    and the hat of wrongness Salem's Avatar
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    Here's a hint

    1. char chart[10][10];
    2. Fill it with spaces
    3. Fill in the stars, as you would say drawing the thing on graph paper
    4. print it all out.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
    I support http://www.ukip.org/ as the first necessary step to a free Europe.

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    I just handed in an assignment like this last week for my programming in c class. It's just a simple histogram.
    Code:
    void histogram(double input[],double range, double max, double min,char fname[], int n)
    {
     	double storage_bins[22];
    	double factor;
    	double top;
    	double bottom;
    	double increment;
    	double top2 ;
    	double minimum;
    	double scale;
    	double cur_value;
    	double stars_to_print;
    	int i;
    	int j;
    	int max_hist;
    	int line;
    	int sum = 0;
    	system("cls");
            factor = factor_function(range);
            top = ceil(max*factor)/factor;
    	top2 = top;
            bottom = floor(min*factor)/factor;
            increment = (top-bottom)/10.;
    	printf("Histogram for %s\n", fname);
    	/* 1. Find the number of occurances of a file between certain ranges*/
    	minimum = top - increment/2.;
    	for(i = 0; i < 22; i ++)
    	{
    		if(i == 0)
    		{
    			for(j = 0; j < n; j++)
    			{
    				if(input[j] == top2)
    					sum +=1;
    			}
    		storage_bins[i] = sum;
    	
    		}
    		else
    		{			
    				
    			for(j = 0; j <n; j ++)
    			{
    		
    				if(input[j] <= top2 && input[j] > minimum)
    				{
    					sum += 1;
    				}
    			storage_bins[i] = sum;
    			}
    		
    	
    			top2 = top2 - increment/2.;
    		minimum = minimum - increment/2;
    		}
    	sum = 0;
    		
    		
    	
    	}
    	
      	/* 2. Calculate the number of stars to print for each bin*/
    
    	max_hist = storage_bins[0];
    	for (i=1; i<22; i++)
    	{
    		if(storage_bins[i]>max_hist)
    			max_hist = storage_bins[i];
    
    	}
    	
    	scale = max_hist/60.;
    	for (line=0; line<21; line++)
    		storage_bins[line] = storage_bins[line]*scale +.5;
    	/* 3. Print the Histogram and the stars. */
    
    
    	for(line=1, cur_value=top; line<= 21; line++, cur_value-=increment/2.)
    	{
    		//if line is odd, print the current value.
    		if(line%2)
    			printf("%f\t", cur_value);
    		else
    		//if line is even don't print a value. shows a space
    			printf("\t\t");
    
    		//prints the vertical line
    		printf("| ");
    		//calculates how many stars to print for the data in the current range
    		stars_to_print = storage_bins[line-1] * scale;
    		//prints stars
    		for(i=0;i < stars_to_print; i ++)
    			printf("*");
    		
    	
    	
    		printf("\n");
    	}
    
    	printf("press any key to continue...");
    	getche();
    
    }
    hope this helps

  13. #13
    and the hat of wrongness Salem's Avatar
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    > I just handed in an assignment like this last week for my programming in c class.
    And how does that help the OP?

    We try to help people understand what they're trying to do - however difficult it might seem initially. Spoon-feeding answers is in no-ones long term interest.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
    I support http://www.ukip.org/ as the first necessary step to a free Europe.

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    yea, I'm very sorry. I read that on the homework for the messages. I was just too excited that i knew how to do it. next time i will be more careful. If an admin would like to take down that last post go ahead...

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