Thread: file select

hi
ive written a program which so far reads in data from a file.

Code:

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

// the number of ints for the fishers structure
#define MAX 4

struct fisher
{
   char name[80];
   char address[90];
   char postcode[14];
   /*
    * the int will hold, firstly a competetitor number, then a number for each
    * competition weight in ounces
    */
   int compNumber [MAX];
};

FILE *fisher_get(FILE *file, struct fisher *fisher)
{
   char line[80], *newline;
   int  i, stones, pounds, ounces;
   /*
    * Get the name.
    */
   if ( !fgets(fisher->name, sizeof fisher->name, file) )
   {
      return NULL;
   }
   newline = strchr(fisher->name, '\n');
   if ( newline )
   {
      *newline = '\0';
   }
   printf("fisher->name = \"%s\"\n", fisher->name);
   /*
    * Get the address and post code.
    */
   if ( fscanf(file, "%89[^.]. %13[^\n]%*c", fisher->address, fisher->postcode) != 2 )
   {
      return NULL;
   }
      printf("fisher->address = \"%s\"\n", fisher->address);
      printf("fisher->postcode = \"%s\"\n", fisher->postcode);
   /*
    * Read and discard next line (or do whatever with it).
    */
   fgets(line, sizeof line, file);
   /*
    * Read the stones, pounds, and ounces for each entry.
    */
   for (i = 0; i < 3; ++i)
   {
      printf("i = %d:\n", i);
      if ( fscanf(file, "%d %d %d%*c", &stones, &pounds, &ounces) != 3 )
      {
         return NULL;
      }
      printf(" stones = %d\n", stones);
      printf(" pounds = %d\n", pounds);
      printf(" ounces = %d\n", ounces);
   }
   return file;
}

int main()
{
   FILE *file = fopen("autumn.txt", "r");
   if ( file != NULL )
   {
      int i;
      char line[80];
      struct fisher fisher;
      /*
       * Read and display first two lines.
       */
      for ( i = 0; i < 2; ++i )
      {
         fgets(line, sizeof line, file);
         fputs(line, stdout);
      }
      while ( fisher_get(file, &fisher) )
      {
      }
      fclose(file);
   }
   return 0;

im just stuck on the best way to select which file the user wants to read, as i have more than one, one called autumn.txt and one called spring.txt.

any help very much welcomed

yeh i know that, but im asking how do i get the:

FILE *file = fopen("spring.txt", "r");

so it can select the result of the inputed file name , instead of a hardcoded file

You can pass filename as a command line argument to the program or select a filename based on some descision criteria. Use that filename (string) in fopen() . For e.g

Code:

constant char *file1 = "abc.txt"
constant char *file2 = "efg.txt"
char *file;
FILE *fp;

if (condition 1 is true)
{
    file = file1;
} else {
    file = file2;
}

fp=fopen(file,"r");

idiot