Thread: Help with pointers and structs

Hey guys-- I am stuck on the very last program of this semester

Problems with program:
1. Input file is only accepting the name, no other fields.
2. Outputting only the headers, no info from the data file.

I know the problem is with the struct, I am allocating memory for a number of records, but I am not sure how to access them one at a time and retrieve them in the proper sequence.

I am also including what the output should look like.

The Code:

Code:

 #include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
#define CLS                     printf("\033[2J")
#define LOCATE(r,c)             printf("\033[%d;%dH",r,c)
#define PAUSE LOCATE(23,20);    printf("Press Any Key to Continue");
getch();

FILE *fileptr;
FILE *stream;
float ftotal;
int i, linecount;



struct employees
{char name[20];
int pnumber;
int dnumber;
int snumber;
float amount;
}person[5];

void paintscreen(), addrecord(), enterdata();
void printheaders(), processdetail();
void printfinaltotal(), printdetailline();
void printpersontotal(float *ptotal, int *pcontrol, float *dtotal);
void printdeparttotal(float *dtotal, int *dcontrol);
void printstoretotal(float *stotal, int *scontrol);

void main()
{stream=fopen("c:\p7adv.out", "w");
addrecord();
if((fileptr=fopen("a:sales", "r"))==NULL)
  {puts("Can't open file");
   PAUSE;
   exit(1);
   }
 printheaders();
 processdetail();
 printfinaltotal();
 fclose(fileptr);
 fclose(stream);
 }

void addrecord()
{fileptr=fopen("a:sales", "a");
 paintscreen();
 while(strlen(gets(person[i].name)) != 0)
 {enterdata();
  paintscreen();
 }
 fwrite(person, sizeof(person[0]), i, fileptr);
 i=0;
 fclose(fileptr);
 }

void paintscreen()
{CLS;
LOCATE(7,35);
puts("Data Entry Screen");
LOCATE(10,10);
puts("Employee Name: ");
LOCATE(12,10);
puts("Emp. Number: ");
LOCATE(14,10);
puts("Department Number: ");
LOCATE(16,10);
puts("Store Number: ");
LOCATE(18,10);
puts("Amount of sales: ");
LOCATE(10,26);
fflush(stdin);
}

void enterdata()
{LOCATE(12,24);
 scanf("%d", person[i].pnumber);
 LOCATE(14,30);
 scanf("%d", person[i].dnumber);
 LOCATE(16,25);
 scanf("%d", person[i].snumber);
 LOCATE(18,27);
 scanf("%f", person[i++].amount);
  }

void printheaders()
{static int pagecount = 1;
 fprintf(stream, "\t        Sales Report        Page %d\n\n\r", pagecount++);
fprintf(stream, "\tName   \t   Department     \t  Amount");
 linecount = 3;
 }

 void printfinaltotal()
 {fprintf(stream, "Final Total         %5.2f \n\r",  ftotal);
 }

 void printdetailline()
 {if(++linecount>50)
  {printheaders();
   linecount++;
   }
  fprintf(stream, "%-20s           %d         %d      %5.2f \n\r", person[i].name, person[i].dnumber, person[i].snumber, person[i].amount);
  }

 void processdetail()
 {
 int pcontrol, dcontrol, scontrol;
  float ptotal = 0.0;
  float dtotal = 0.0;
  float stotal = 0.0;
  fread(person, sizeof(person), 1, fileptr);
  pcontrol = person[i].pnumber;
  dcontrol = person[i].dnumber;
  scontrol = person[i].snumber;
  do
   if(person[i].dnumber != dcontrol)
    {
    printpersontotal(&ptotal, &pcontrol, &dtotal);
    printdeparttotal(&dtotal, &dcontrol);
    }
   else
   if(person[i].pnumber != pcontrol)
     {
     printpersontotal(&ptotal, &pcontrol, &dtotal);
     printdetailline();
     ptotal += person[i].amount;
     }
     while (fread(person, sizeof(person), 1, fileptr));
  printpersontotal(&ptotal, &pcontrol, &dtotal);
  printdeparttotal(&dtotal, &dcontrol);
  printstoretotal(&stotal, &scontrol);
  }

  void printpersontotal(float *ptotal, int *pcontrol, float *dtotal)
  {fprintf(stream, "\n\r  Person Total   %5.2f \n\n\r", *ptotal);
   *dtotal += *ptotal;
   *ptotal = 0.0;
   *pcontrol = person[i].pnumber;
   linecount += 3;
   }

  void printdeparttotal(float *dtotal, int *dcontrol)
   {fprintf(stream, "\n\r  Department Total    %5.2f \n\n\r", *dtotal);
    ftotal += *dtotal;
    *dtotal = 0;
    *dcontrol = person[i].dnumber;
    linecount += 3;
    }

  void printstoretotal(float *stotal, int *scontrol)
  {fprintf(stream, "\n\r  Store Total        %6.2f \n\n\r", *stotal);
   ftotal += *stotal;
   *stotal = 0;
   *scontrol = person[i].snumber;
    linecount += 3;
   }

The output should look like this (I am only getting the headers):

Code:

  Sales Report				page 1
Name		Department		store  		Amount
M. Smith	100			1		10.00
M.Smith		100			1		20.00

Person Total:	30.00

B. Smith	100			1		40.00

Person total:	40.00

Department Total:  70.00

C. Smith	200			1		50.00

Person Total:  50.00

Department Total:  70.00

Store Total:  120.00

D. Smith	100			2		60.00

Person Total:  60.00

Department Total:  60.00

Store Total:   60.00

Final Total:   180.00

I use a 'learnc' complier and I was never taught the 'rb' mode.

I am only familiar with the 'r', 'r+', 'w', 'w+', 'a', 'a+' modes.

I am not getting anything from the infile in output and the infile seems to be only accepting the Name, and not the store, dept. number, etc.

What is wrong with the code I gave and how can I improve on it?

The program gets handed in early next week and I have no time to completely redo it.

quzah,
the man page says

This is strictly for compatibility with ANSI C3.159-1989 (``ANSI C'') and has no effect; the ``b'' is ignored.

Is this only for *NIX systems? Does windows require the b?

Thanks guys,

Prof is very particular of code, and the code he accepts is very convoluted. Quzah I will use the links you kindly gave for future reference.

Thanks again you guys were very informative.