FILE HANDLING IN C

File
=====

File Handling In C is Very Simple. As it essentially Treats a File as Just Stream of Characters and accordingly allows to input and output to the file.

Steps To Handle a File
=======================

1) Open The File
2) Access The File
3) Close The File

Syntax For To Declare a File Pointer
====================================

FILE *p;

p=fopen("FileName","Mode");


Mode
====
r - ReadMode
w - WriteMode
a - AppendMode

r+ - Read+Write
w+ - Write+Read
a+ - Append+Read

File Handling Functions
========================

Character Oriented Functions
============================
1) fgetc()
2) fputc()

String Oriented Functions
============================
1) fgets()
2) fputs()

Reading & Writing Records To The File
=====================================
1) fwrite()
2) fread()

Formatted IO Functions
============================
1) fprintf()
2) fscanf()

File Handling in C

Fopen()

Fprintf()

Fscanf()

Fclose()

#include<stdio.h>

#include<conio.h>

void main()

{

FILE *fp;

Char name[40];

Char ans=’y’;

Int age;

Float bs;

Clrscr();

Fp=fopen(“EMPLOYEE.DAT”,”w”);

If(fp==NULL)

{

printf(“Cannot open file”);

exit();

}

while(ans= =’Y’ || ans= =’y’)

{

printf(“\n Enter name, age and basic salary:\n”);

scanf(“%s%d%f”,name,&age,&bs);

fprintf(fp,”%s%d%f\n”,name,age,bs);

printf(“\n Another employee(y/n)”);

scanf(“%c”,&ans);

}

fclose(fp);

}

#include<stdio.h>

#include<conio.h>

void main()

{

FILE *fp;

Char name[40];

Int age;

Float bs;

Clrscr();

Fp=fopen(“EMPLOYEE.DAT”,”r”);

If(fp==NULL)

{

printf(“Cannot open file”);

exit(0);

}

while(fscanf(fp,”%s%d%f”,&name,&age,&bs)        != EOF)

printf(“\n %s%d%f”,name,age,bs);

fclose(fp);

}

#include<stdio.h>

#include<conio.h>

void main()

{

FILE *infile;

Char name[20];

Char street[20];

Char city[15];

Char pin[7];

Int cho=1;

Char s[20];

Clrscr();

Printf(“File Name?\n”);

Scanf(“%s”,&s);

Infile=fopen(s,”a”);

While(cho==1)

{

printf(“\n Type your name:”);

scanf(“%s”,&name);

printf(“\n Type your street name:”);

scanf(“%s”,&street);

printf(“\n Type your city name:”);

scanf(“%s”,&city);

printf(“\n Type your pincode:”);

scanf(“%s”,&pin);

fprintf(infile,”%s\t”,name);

fprintf(infile,”%s\t”,street);

fprintf(infile,”%s\t”,city);

fprintf(infile,”%s\t”,pin);

fprintf(infile,”\n”);

printf(“Enter 1 to continue:”);

scanf(“%d”,&cho);

}

fclose(infile);

}

#include<stdio.h>

#include<conio.h>

void main()

{

FILE *infile;

Char name[20];

Char street[20];

Char city[15];

Char pin[7];

Char s[20];

Clrscr();

Printf(“File Name?\n”);

Scanf(“%s”,&s);

If((infile=fopen(s,”r”))=NULL)

{

printf(“Cannot open file”);

exit();

}

while(fscanf(infile,”%s%s%s%s”,name,street,city,pin)!=EOF)

{

printf(“\n Name:%s\t”,name);

printf(“\n Street:%s\t”,street);

printf(“\n City:%s\t”,city);

printf(“\n Pin:”%s\t”,pin);

printf(“\n”);

}

fclose(infile);

getch();

}