C Program to demonstrate the ‘fgets’ function.

Posted on October 17, 2011 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 October 13, 2011 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 for file operations.

Posted on October 4, 2011 by Sandeepa Nadahalli

C program to create a file called emp.txt and store information about a person, in terms of his name, age and salary.

/***********************************************************
* 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>

void main()
{
	FILE *fptr;
	char name[20];
	int age;
	float salary;

	fptr = fopen ("emp.txt", "w"); /*open for writing*/

	if (fptr == NULL)
	{
		printf("File does not existsn");
		return;
	}

	printf("Enter the namen");
	scanf("%s", name);
	fprintf(fptr, "Name    = %sn", name);

	printf("Enter the agen");
	scanf("%d", &age);
	fprintf(fptr, "Age     = %dn", age);

	printf("Enter the salaryn");
	scanf("%f", &salary);
	fprintf(fptr, "Salary  = %.2fn", salary);

	fclose(fptr);
}
/*Please note that you have to open the file called emp.txt in the directory*/

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