12 hours later I am giving a c exam need help solving sample question

This is a discussion on 12 hours later I am giving a c exam need help solving sample question within the C Programming forums, part of the General Programming Boards category; Question: Swinburne Sarawak Grading Scheme: Student mark (0-100) Corresponding grade 85 – 100 “H” 75 – 84 “D” 65 – ...

  1. #1
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    12 hours later I am giving a c exam need help solving sample question

    Question:
    Swinburne Sarawak Grading Scheme:


    Student mark (0-100) Corresponding grade
    85 – 100 “H”
    75 – 84 “D”
    65 – 74 “C”
    50 – 64 “P”
    0 – 49 “N” (4 points) Draw a flowchart to:
    · get one student’s mark · decide and display which grade the mark is in ( make a series of if / else decisions) - 1 pt · add 1 (one) to the corresponding counter for grade HD and grade N
    · ask if this is the last student · if not the last student, return to the start to get the next student’s mark
    · if no more student, find if the number of students who score H is bigger than the number of students who score N
    o if yes, print “Good Result” o else, print “Poor Result’ mY ANSWER NEDDS EDITING and has some error please correct:
    Code:
    #include<stdio.h>
    int main()
    {
         float mark;
         int hd=0;
         int l=0;
         char decision;
         
         do{
              printf("Enter mark of student:");
              scanf("%f",&mark);
              if(mark<=100 && mark>=85)
              {
                    printf("H\n");
                    
                               
              } 
              if(mark<=84 && mark>=75)
         
              {
                   printf("D\n");
               
              }
             
              if(mark<=74 && mark>=65)
         
              {
                   printf("C\n");
             
              }
              if(mark<=64 && mark>=50)
         
              {
                   printf("P\n");
             
              }
              if(mark<=49 && mark>= 0)
              {
                   printf("N\n");
         
                   
              }
             
              if(mark<=100 && mark>=85)
              { 
              hd=0;
              l=hd+l;
              l++;
              
             }      
                    
              printf("Is this the last student?\n");
              scanf("%ch",&decision);
              
         }while(decision!='y');
         
                              
         if(hd>l)
         {
              printf("Good Result");
         } 
         else
         {
              printf("Poor Result");
         }
         
    }

  2. #2
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    Add a space after the %f, on line 11

    Add the int variable's of h and n. Assign zero to both of them. Remove l.

    If the marks are either earning an H or an N, then h++ or n++.

    and welcome to the forum!

    P.S. i guess "hd" could work for the "h" variable, just fine.

    You'll need to replace the el variable, though. Looks too much like a 1 or an I.
    Last edited by Adak; 10-04-2012 at 09:37 AM.

  3. #3
    and the hat of int overfl Salem's Avatar
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    What does "some error" mean?

    Code:
    $ gcc -Wall bar.c
    bar.c: In function ‘main’:
    bar.c:67:1: warning: control reaches end of non-void function [-Wreturn-type]
    Edit:
    > Add a space after the %f, on line 11
    Adding a space before the %c would be better.

    Further, "%ch" really doesn't do what you think it should.

    Unless you insist on typing
    "yh"
    or
    "nh"
    for every response to the yes/no question.
    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.

  4. #4
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    where should I write h++ and n++?

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    line 15 for h++.

    line 44-50 should be deleted.

    line 40 should be n++.

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    But in the sample question it is said to ask the user if it is the last student?. We are supposed to take the marks multiple students. If the total number of H and D exceeds the number of N then good result is displayed. Can you please show in proper codes where I am going wrong?
    Last edited by Burns111; 10-04-2012 at 11:17 AM.

  7. #7
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    No I won't do that.

    When you enter a high score, you add one to the number of students with a high score, h++ (or hd if you like)
    When you enter a low score, you add one to the number of students with a low score: n++;

    After you have entered all the students scores, you compare to see if (h > n) or not. If so, then print Good Result, if not, print Bad Result.

  8. #8
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    I finally got it right!
    Code:
    #include<stdio.h>
    int main()
    {
         float mark;
         int h=0;
         int n=0;
         char decision;
         
         do{
              printf("Enter mark of student:");
              scanf("%f",&mark);
              if(mark<=100 && mark>=85)
              {
                    printf("H\n");
                    h++;
                               
              } 
              if(mark<=84 && mark>=75)
         
              {
                   printf("D\n");
                   h++;
                   
              }
             
              if(mark<=74 && mark>=65)
         
              {
                   printf("C\n");
             
              }
              if(mark<=64 && mark>=50)
         
              {
                   printf("P\n");
             
              }
              if(mark<=49 && mark>= 0)
              {
                   printf("N\n");
                   n++;
                   
              }
             
              printf("Is this the last student?\n");
              fflush(stdin);
              scanf("%c",&decision);
              
         }while(decision!='y');
                             
         if(h>n)
         {
               printf("Good Result");
         } 
         else
         {
               printf("Poor Result");
         }
         
    }

  9. #9
    TEIAM - problem solved
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    Look for fflush(stdin) on the FAQ -> you shouldn't use it.
    Fact - Beethoven wrote his first symphony in C

  10. #10
    and the hat of int overfl Salem's Avatar
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    > I finally got it right!
    Erm, no you didn't.

    > fflush(stdin);
    You put this in, instead of reading posts from myself and Adak regarding the use of space in format strings.
    FAQ > Why fflush(stdin) is wrong - Cprogramming.com
    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.

  11. #11
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    Two suggestions Burns:

    Code:
              fflush(stdin);           //remove this fflush() works on OUTWARD streams, not inward ones
              scanf(" %c",&decision);  //note the space added before the % - will help, here
    And well done!

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