file operations

C Program to find the size of a given file.

Posted on by Sandeepa Nadahalli
Write a C Program to find the size of a given file.
The function fseek() is used to set the file pointer at the specified position. In general, it is used to move the file pointer to the desired position within the file.
In this program we moved the file pointer to the end of file, and obtain the current position of the file pointer. Function rewind() also moves the file pointer to the beginning of the file, but syntax and number of parameters are different. Read more about C Programming Language .

/***********************************************************
* You can use all the programs on  www.c-program-example.com
* for personal and learning purposes. For permissions to use the
* programs for commercial purposes,
* contact [email protected]
* To find more C programs, do visit www.c-program-example.com
* and browse!
* 
*                      Happy Coding
***********************************************************/


#include<stdio.h>
#include<process.h>
long file_size(FILE *fp)
 {
     long len;
    //move file pointer to end of the file */
    fseek(fp, 0L, 2);
    //Obtain the current position of file pointer
    len = ftell(fp);
    return len;
 }
void main(void)
 {
   FILE *fp;
   char filename[20];
   printf("nEnter the file name:nn");
   scanf("%s",filename);

   fp = fopen(filename, r);
   
   if(fp == NULL)
    {
       printf("Error:  file not found!nn");
       exit(0);
    }
  printf("File size of %s is %ld bytesnn",filename, file_size(fp));
  fclose(fp);
 }

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K & R C Programs Exercise 7-8.

Posted on by Sandeepa Nadahalli
K and R C, Solution to Exercise 7-8:
K and R C Programs Exercises provides the solution to all the exercises in the C Programming Language (2nd Edition). You can learn and solve K&R C Programs Exercise.
C Program to print a set of files, starting each new one on a new page, with a title and running page for each file Read more about C Programming Language .

/***********************************************************
* You can use all the programs on  www.c-program-example.com
* for personal and learning purposes. For permissions to use the
* programs for commercial purposes,
* contact [email protected]
* To find more C programs, do visit www.c-program-example.com
* and browse!
* 
*                      Happy Coding
***********************************************************/

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

#define MAXBOT 3
#define MAXHDR 5
#define MAXLINE 100
#define MAXPAGE 66

/*print: print files - each new one on a new page  */
main(int argc, char *argv[])
{

 FILE *fp;
 void fileprint(FILE *fp, char *fname);

 if(argc == 1)
  fileprint(stdin," ");
 else
  if((fp = fopen(*++argv,"r")) == NULL) {
   fprintf(stderr,"find:can't open %sn",*argv);
   exit(1);
  } else {

   fileprint(fp, *argv);
   fclose(fp);
  }
 return 0;
}


//fileprint: print file name
void fileprint(FILE *fp, char *fname)
{
 int lineno, pageno = 1;
 char line[MAXLINE];
 int heading(char *fname, int pageno);
 lineno = heading(fname, pageno++);
 while(fgets(line, MAXLINE, fp) != NULL) {
  if(lineno == 1) {
   fprintf(stdout,"f");
   lineno = heading(fname, pageno++);
  }
  fputs(line, stdout);
  if(++lineno > MAXPAGE - MAXBOT)
   lineno = 1;
 }
 fprintf(stdout,"f");
}

//heading: put heading and enough blank lines
int heading(char *fname, int pageno)
{
 int ln = 3;
 fprintf(stdout,"nn");
 fprintf(stdout,"%s page %dn", fname, pageno);
 while(ln++ < MAXHDR)
  fprintf(stdout,"n");
 return ln;
}
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C Program which produces its own source code as its output.

Posted on by Sandeepa Nadahalli
Write a c program which produces its own source code as its output.
This C program uses the C File i/o operations like fopen(), fclose(). In this program, We pritn the source code of the program.Read more about C Programming Language .

/***********************************************************
* You can use all the programs on  www.c-program-example.com
* for personal and learning purposes. For permissions to use the
* programs for commercial purposes,
* contact [email protected]
* To find more C programs, do visit www.c-program-example.com
* and browse!
* 
*                      Happy Coding
***********************************************************/

#include<stdio.h>
int main()
{
 FILE *fp;
 char c;

 fp = fopen(__FILE__,"r");

 do{

  c= getc(fp);

  putchar(c);

 }
 while(c!=EOF);

 fclose(fp);

 return 0;

}


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C Program to demonstrate the ‘fgets’ function.

Posted on by Sandeepa Nadahalli
Program to demonstrate the ‘fgets’ function. The program will count the number of lines in a file. This is a function of the UNIX command ‘wc’. Read more about C Programming Language .

/***********************************************************
* You can use all the programs on  www.c-program-example.com
* for personal and learning purposes. For permissions to use the
* programs for commercial purposes,
* contact [email protected]
* To find more C programs, do visit www.c-program-example.com
* and browse!
* 
*                      Happy Coding
***********************************************************/



#include <stdio.h>

#define LINE_LENGTH 80

main()
{
 FILE* fp;
 char line[LINE_LENGTH];
 int count=0;

 fp=fopen("/home/DOC/C/c.html","r");
 /* Count up the lines here. */
 while ( fgets(line, LINE_LENGTH, fp) != NULL) count++;

 printf("File contains %d lines.n", count);

 fclose(fp);
}
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C Program to reverse the first n characters in a file.

Posted on by Sandeepa Nadahalli
C Program to reverse the first n characters in a file using the command line arguments. Here we read the file name and n are specified on the command line. If file exists, it reverse the n characters, else it gives the error message. Read more about C Programming Language . 

/***********************************************************
* You can use all the programs on  www.c-program-example.com
* for personal and learning purposes. For permissions to use the
* programs for commercial purposes,
* contact [email protected]
* To find more C programs, do visit www.c-program-example.com
* and browse!
* 
*                      Happy Coding
***********************************************************/


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

void main(int argc, char *argv[])
{
 char a[15];
 char s[20];
 char n;
 int k;
 int j=0;
 int i;
 int len;
 FILE *fp;

 if(argc!=3)
 {
  puts("Improper number of arguments.");
  exit(0);
 }
 fp = fopen(argv[1],"r");
 if(fp == NULL)
 {
  puts("File cannot be opened.");
  exit(0);
 }

 k=*argv[2]-48;
 n = fread(a,1,k,fp);
 a[n]='';
 len=strlen(a);
 for(i=len-1;i>=0;i--)
 {
  s[j]=a[i];
  printf("%c",s[j]);
  j=j+1;
 }
 s[j+1]='';
 getch();
}/*(Note: The file name and n are specified on the command line.)*/

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C program which copies one file contents to another file.

Posted on by Sandeepa Nadahalli
C Program which copies one file contents to another file. Here we read the one file and copies the characters to another file which are existed in the disc. Here we read the file names from the command line.Read more about C Programming Language . 

/***********************************************************
* You can use all the programs on  www.c-program-example.com
* for personal and learning purposes. For permissions to use the
* programs for commercial purposes,
* contact [email protected]
* To find more C programs, do visit www.c-program-example.com
* and browse!
* 
*                      Happy Coding
***********************************************************/



#include <stdio.h>
#include <conio.h>
#include <process.h>

void main(int argc, char *argv[])
{
 FILE *fs,*ft;
 char ch;
 clrscr();
 if(argc!=3)
 {
  puts("Invalid number of arguments.");
  exit(0);
 }
 fs = fopen(argv[1],"r");
 if(fs==NULL)
 {
  puts("Source file cannot be opened.");
  exit(0);
 }
 ft = fopen(argv[2],"w");
 if (ft==NULL)
 {
  puts("Target file cannot be opened.");
  fclose(fs);
  exit(0);
 }
 while(1)
 {
  ch=fgetc(fs);
  if (ch==EOF)
   break;
  else
   fputc(ch,ft);
 }
 fclose(fs);
 fclose(ft);
 getch();
}

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