Question

virtual cashier program please modify

Asked by: jomfra

hello expert,

i have written a program for  virtual cashier system using dev c++.
the following is the program
could you please and make modification where neccessary.



#include<stdio.h>
#include<stdlib.h>
int main (void)
{
    float b,c,d,e,f,g,h,i,j,k,r,s,t,x,y,z;
    t=0;
    z=0;
    char a[100];

   
    printf("enter name of customer-");
    scanf("%s",&a);
   
   
    printf("enter number of items purchased by %s-",a);
    scanf("%f",&b);

    for (x=1;x<b;x++)
    {
   
  printf("enter the num of itmes purchased-");
  scanf("%f",&c);
printf("enter the cost of items -");
scanf("%f",&d);
z=c*d;
 t=t+(c*d);
 
        printf ("the cost  of items purchased= %f x %f= %f \n",c,d,z);
}
{      
printf("grand total is =%f\n",t);

}
e=(t*0.2);
printf(" 20% vat charge on items purchase := %f\n",e);

f = (t+e);
printf (" total cost of all items purchase := %f\n",f);

printf("money given by %s-",a);
scanf("%f",&g);

if (g>=f)
{
h=g-f;
printf("refund (change) given to %s-%f\n",a,h);
}
else
{
    printf("no change due\n\n");
}





    system("pause");
}

thanks

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Asked On
2007-09-02 at 17:34:13ID22802919
Tags

cashier

,

program

,

virtual

Topics

C++ Programming Language

,

C Programming Language

Participating Experts
4
Points
500
Comments
16

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Answers

 

by: jkrPosted on 2007-09-02 at 19:18:26ID: 19818747

In

    printf("enter name of customer-");
    scanf("%s",&a);
   
the '&' for 'a' is incorrect, just make that

    printf("enter name of customer-");
    scanf("%s",a);
   
Otherwise you will pass the address of the 1st element, and that is not what you want to do.

 

by: Infinity08Posted on 2007-09-02 at 23:56:42ID: 19819420

>> could you please and make modification where neccessary.

What kind of modifications are you talking about ?
Do you notice any problems ? Do you have features that you need to add ?

 

by: ikeworkPosted on 2007-09-03 at 00:37:06ID: 19819526

hi jomfra,

the loop looks a bit weird .. if number of items is 1, its not executed at all.
if it is 2, then the loop is executed once. and you are asking in the loop again for
"number of items purchased" .. why is that?

>> float x;
>> printf("enter number of items purchased by %s-",a);
>> scanf("%f",&b);
>> for (x=1;x<b;x++)
>> {
>>   printf("enter the num of itmes purchased-");
>>   scanf("%f",&c);

besides you should use the "++"-increment-operator on int's, not on a float


>> float b,c,d,e,f,g,h,i,j,k,r,s,t,x,y,z;

it helps a lot, if you start using better names for your variables...


ike

 

by: ikeworkPosted on 2007-09-03 at 00:40:59ID: 19819533

firstable i think you should think about what is the program supposed to do ..
put it in pseudocode and then start writing the real code for it ..

of course we can help you with each step ..

 

by: jomfraPosted on 2007-09-03 at 04:57:21ID: 19820212

hello ikework,

is it possible you can rewrite the above program using better names for
varibles etc.

I am new to this and need a good example to follow .

i will go ahead and increase the point .

hello moderator i need to increase this pionts to 500

 

by: jomfraPosted on 2007-09-03 at 04:58:45ID: 19820220

hello moderator,

Could please increase the points to 500

 

by: jomfraPosted on 2007-09-03 at 05:01:28ID: 19820231

hello moderator,

please ignore the request to increase point i inadvertently attach request

to the wrong question.

thanks

 

by: ikeworkPosted on 2007-09-03 at 05:07:47ID: 19820248

>> is it possible you can rewrite the above program using better names for varibles etc.

well, we can help you learning and assist you .. but i won't do the work for you .. then you have to hire a programmer ;)

why not giving it a try and post here what you have changed so far .. i'm sure we can help you doing it ..
that way you will learn a lot more .. its your turn .. :)


ike

 

by: Infinity08Posted on 2007-09-03 at 05:30:50ID: 19820330

>> is it possible you can rewrite the above program using better names for varibles etc.

1) jkr made an important remark - one that you should modify.

2) ike's remark about the loops is very valid - so you should modify the loop accordingly (either use integers for amounts and loop counters, or don't use ++).

3) As ike pointed out, right now, you have variable names that don't mean anything. It makes following the code very difficult, and makes making mistakes a lot easier.

Compare this :

    scanf("%f",&d);
    z=c*d;

to this eg. :

    scanf("%f", &item_cost);
    total_item_cost = item_amount * item_cost;

The second is easier to understand what's happening.


Making these three modifications to your code will already make it a lot better. Give it a try, and post your results here, and we'll help you further if needed.


Note that this is just a summary post, with no real new information, so it doesn't deserve any points ;)

 

by: itsmeandnobodyelsePosted on 2007-09-03 at 09:06:54ID: 19821229

You posted the question in the C++ TA as well, but it is pure C code. Are you interested in suggestions regarding C++? Some of the problems, e. g. 'scanf', 'putting all code into one main function', would be made very differently when actively using classes, STL, cout/cin, ... But I don't want you to bother with C++  if the requirements were for C only ...

Regards, Alex

 

by: jkrPosted on 2009-09-11 at 15:34:46ID: 25314037

Problem identified in the 1st comment, wonder why you want to delete this...

 

by: Infinity08Posted on 2009-09-12 at 02:27:10ID: 25315721

jkr, it's not REALLY a problem, is it ? The code still works just fine ;) &a and a have the same address - they just differ in type (but scanf doesn't care about that).

Plus, the author didn't ask to fix a problem - jomfra asked to check the code and to suggest improvements (see http:#19820212). Which we all gave, but then the author didn't get back to us, and we haven't really gotten to the bottom of this ... So I'm also leaning towards a delete/no refund.

 

by: itsmeandnobodyelsePosted on 2009-09-12 at 04:48:45ID: 25316080

>>>> the author didn't ask to fix a problem

Not REALLY ;-)

The title of the q. is

>>>> virtual cashier program please modify

Where is the problem to accept the first comment as a solution?

20120131-EE-VQP-002

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