C file I/O functions

C file I/O functions

logic how to detect end of file:

1. (stdio.h) library details can be found here::
2. (math.h)library details can be found here::
3. (cstring.h library )function memset
4. function feof():: it contains goood library and function information. good reference

   /* feof example: byte counter */
   #include <stdio.h>
   
   int main ()
   {
     FILE * pFile;
     int n = 0;
     pFile = fopen ("myfile.txt","rb");
     if (pFile==NULL) perror ("Error opening file");
     else
     {
       while (fgetc(pFile) != EOF) {
         ++n;
       }
       if (feof(pFile)) {
         puts ("End-of-File reached.");
         printf ("Total number of bytes read: %d\n", n);
       }
       else puts ("End-of-File was not reached.");
       fclose (pFile);
     }
     return 0;
   }
   

5. EOF, getc() and feof() in C

   #include <stdio.h>
    
   int main()
   {
     FILE *fp = fopen("test.txt", "r");
     int ch = getc(fp);
     while (ch != EOF) 
     {
       /* display contents of file on screen */
       putchar(ch); 
    
       ch = getc(fp);
     }
      
     if (feof(fp))
        printf("\n End of file reached.");
     else
        printf("\n Something went wrong.");
     fclose(fp);
        
     getchar();
     return 0;
   }
   

6. Detecting EOF in C
7. Checking if the file pointer has reached EOF without moving the file pointer?
8. How to use EOF to run through a text file in C?
9. End of File (EOF) in C

the following section is about file I/O related functions.

10. C scanf()
11. C printf()
12. C – printf and scanf
13. C Programming Examples on File Handling
14. File Handling in C Language:: good examples

    an example to write to a file from std input and display the file::

    #include<stdio.h>
    #include<conio.h>
    main()
    {
     FILE *fp;
     char ch;
     fp = fopen("one.txt", "w");
     printf("Enter data");
     while( (ch = getchar()) != EOF) {
        putc(ch,fp);
     }
     fclose(fp);
     fp = fopen("one.txt", "r");
     
     while( (ch = getc(fp)! = EOF)
        printf("%c",ch);
        
     fclose(fp);
    }
    

    another example::

    /* read and write to file */
    #include<stdio.h>
    #include<conio.h>
    struct emp
    {
       char name[10];
       int age;
    };
    
    void main()
    {
       struct emp e;
       FILE *p,*q;
       p = fopen("one.txt", "a");
       q = fopen("one.txt", "r");
       printf("Enter Name and Age");
       scanf("%s %d", e.name, &e.age);
       fprintf(p,"%s %d", e.name, e.age);
       fclose(p);
       do
       {
          fscanf(q,"%s %d", e.name, e.age);
          printf("%s %d", e.name, e.age);
       }
       while( !feof(q) );
       getch();
    }
    

15. File Handling in C with Examples (fopen, fread, fwrite, fseek)
16. File Handling in C Language
17. Detecting EOF in C
18. How to use EOF to run through a text file in C?