reading and writing to a binary file

Hey people, i've followed the tutorial on how to do file I/O to binary files however i need one more line, but im not sure what to type in :(

its supposed to open the binary file binFile for reading and writing. then w ite each student record into binFile and therefore read the specified student record from the binary file into the temporary variable tempStudent.

Code:

---

#include<stdlib.h>
#include<stdio.h>

struct student
{
  char name[200];
  float marks;
};

int main()
{

  FILE * txtFile;
  struct student tempStudent;
  // File pointer to binary file
  FILE * binFile;
  int searchNum;

  if ((txtFile = fopen("input.txt", "r")) == NULL)
  {
    printf("Can not open file input.txt\n");
  }

  else
  {
    binFile = fopen("binary_file.txt", "wb");
  }


  while (fscanf(txtFile,"%s %f", tempStudent.name, &(tempStudent.marks)) == 2)
  {
  // write code that stores the structure tempStudent into the binary file
  }

    printf("Please enter the student you want to search for\n");
    printf("For example if you want the first student type 1\n");
    scanf("%d", &searchNum);

    fseek(binFile, searchNum*sizeof(tempStudent), SEEK_SET);
    fread(???, sizeof(tempStudent), 1, binFile);

    printf("The student name retreived is: %s\n", tempStudent.name);
    printf("The student mark retreived is: %.2f\n", tempStudent.marks);
    fclose(binFile);
    fclose(txtFile);

  return 0;
}

---

You found fread but didn't see fwrite?

Also tyring to read from a FILE pointer opened for writing isn't the best idea in the world. Wouldn't hurt to reopen the file for reading, which will also rewind the file.

yeah i suppose, just not sure this might work, for the binary file that's another program, i'll create so it just opens the binary file to display the information.

Code:

---

#include<stdlib.h>
#include<stdio.h>

struct student
{
  char name[200];
  float marks;
};

int main()
{

  FILE * txtFile;
  struct student tempStudent;
  // File pointer to binary file
  FILE * binFile;
  int searchNum;
  char s[200];

  if ((txtFile = fopen("input.txt", "r")) == NULL)
  {
    printf("Can not open file input.txt\n");
  }

  else
  {
    binFile = fopen("binary_file.txt", "wb");
  }


  while (fscanf(txtFile,"%s %f", tempStudent.name, &(tempStudent.marks)) == 2)
  {
  // write code that stores the structure tempStudent into the binary file
  }

    printf("Please enter the student you want to search for\n");
    printf("For example if you want the first student type 1\n");
    scanf("%d", &searchNum);

    fseek(binFile, searchNum*sizeof(tempStudent), SEEK_SET);
    fread(name, sizeof(tempStudent), 200, binFile);
    fwrite(name, sizeof(tempStudent), 200, binFile);

    printf("The student name retreived is: %s\n", tempStudent.name);
    printf("The student mark retreived is: %.2f\n", tempStudent.marks);
    fclose(binFile);
    fclose(txtFile);

  return 0;
}

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