printing an array of structures

nic.nmd · #1 19-Oct-2006, 00:53

I am writing a program that reads columns of info from a text file, then sorts the info by alphabetical order from the first column. This won't compile, I highlited the problem below, the code where i try to print the sorted data. I tried changing the '.'s to '->'s but that didn't work. Please help!

CPP / C++ / C Code:

//data.txt

Site Date Reading Rating
Ka5.445 1/02/2006 12.3323 1
Ka2.43345 2/12/2006 23.5534 2
Ka1.43245 23/12/2006 -54.6345 5
J2.3345 1/02/2006 12.1887 3
Gs.7785 2/12/2006 45.0987 6
Mv.57737 4/09/2006 54.8876 1
J2.33444 2/12/2006 12.0086 1
Mv.78868 4/07/2006 0.00984 2
Gs.6654 1/02/2006 334.5667 2
Te.57737 1/05/2006 3.5564 5
J2.33888 6/04/2006 3.7764 4
Te.979949 21/08/2006 443.7757 7
Gs.88632 2/12/2006 33.6655 8
Gs.563636 1/02/2006 1.0086 4
Ha.895848 23/09/2006 -2.7756 4
J2.7745 2/12/2006 -12.5543 8
Ha.895848 5/06/2006 43.8865 2
Ge.646623 2/12/2006 23.7757 1
J2.3545 5/06/2006 0.6634 5

CPP / C++ / C Code:

#include<stdio.h>
#include<string.h>



struct table
{
  char site[15];
  char date[15];
  float reading;
  int rating;
};

void readData(struct table*tableArray);
void printData(struct table*tableArray);
void sortSite(struct table*tableArray);



int main(void)
{
  int choice;
  struct table tableArray[20];
  readData(tableArray);
  while(choice!=4)
  {
    printData(tableArray);
    printf("\n1. Sort by site\n");
    printf("2. Quit\n");
    printf("\nEnter your choice (1 or 2) ");
    scanf("%d",&choice);
    {
      switch(choice)
      {
        case 1:
          sortSite(tableArray);
          break;
        default:
          printf("Invalid entry\n");
          break;
      }
    }
  }
  return(0);
}


void readData(struct table*tableArray)
{
  FILE*data;
  int x=0;
  char site[15];
  char date[15];
  char reading[15];
  char rating[15];
  data=fopen("data.txt","r");
  if(data==NULL)
  {
    printf("Failed to open data.txt");
    exit(0);
  }
  fscanf(data,"%s %s %s %s\n",site,date,reading,rating);
  for(x=0;x<=18;x++)
  {
    fscanf(data,"%s %s %f %d\n",tableArray[x].site,tableArray[x].date,&tableArray[x].reading,&tableArray[x].rating);
  if((fscanf(data,"%s %s %f %d\n",tableArray[x].site,tableArray[x].date,&tableArray[x].reading,&tableArray[x].rating))!=4)
  {
    printf("\n\aError in line %d of data.txt\n",x);
    exit(0);
  }
  }
  fclose(data);
}


void printData(struct table*tableArray)
{
  int x=0;
  printf("Site Date Reading Rating\n");
  for(x=0;x<=18;x++)
  {
    printf("%s %s %f %d\n",tableArray[x].site,tableArray[x].date,tableArray[x].reading,tableArray[x].rating);
  }
}


void sortSite(struct table*tableArray)
{
  int x,y;
  struct table siteSorted;
  for(x=0;x<18;x++)
    for(y=0;y<17;y++)
      if((strcmp(tableArray[y].site,tableArray[y+1].site))>=0)
      {
        siteSorted=tableArray[y+1];
        tableArray[y+1]=tableArray[y];
        tableArray[y]=siteSorted;
      }
  printf("Site Date Reading Rating\n");
  printf("%s %s %f %d\n",siteSorted[x].site,siteSorted[x].date,siteSorted[x].reading,siteSorted[x].rating); // <-problem!?!
}

WaltP · #2 19-Oct-2006, 02:18

Guideline #2 please....

nic.nmd · #3 19-Oct-2006, 02:33

Compiler: Bloodshed Dev-C++
Error msg: "subscripted value is neither array nor pointer"
I changed the code but it still doesn't compile. It is supposed to print out the siteSorted array of structures.

New code (just sortSite function)

CPP / C++ / C Code:

void sortSite(struct table*tableArray)
{
  int x,y;
  struct table siteSorted;
  for(x=0;x<18;x++)
    for(y=0;y<17;y++)
      if((strcmp(tableArray[y].site,tableArray[y+1].site))>=0)
      {
        siteSorted=tableArray[y+1];
        tableArray[y+1]=tableArray[y];
        tableArray[y]=siteSorted;
      }
  printf("Site Date Reading Rating\n");
  for(x=0;x<=18;x++)
  {  
/* problem-> */    printf("%s %s %f %d\n",siteSorted[x].site,siteSorted[x].date,siteSorted[x].reading,siteSorted[x].rating);
  }
}

rastwi · #4 19-Oct-2006, 08:53

quite alot of errors in ur pgm!

readData(tableArray); \\no reference given...
similarly for other functions too...

then declaring like: struct table siteSorted;
and using it like: printf("%s %s %f %d\n",siteSorted[x].site,siteSorted[x].date,siteSorted[x].reading,siteSorted[x].rating); //

just go through it again!

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printing an array of structures

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