write text in a file using c language

Problem

Write a program that asks a user to enter file name to be created. If file is created successfully then display a message "File created" otherwise display error message and exit from program. Then program asks the user to enter any text to be written on that file. Output should be like:

1. Enter the name of file: abc.txt
   File created
2. Enter text for the file
   This is the new file...

Solution - Code

#include<stdio.h>
#include<stdlib.h>
int main ()
{
 char s[80],a[30];
 FILE *fp;

 printf ("Enter file name : ");
 gets (a);

 fp = fopen (a,"w");

 if (fp == NULL)
 {
  printf ("Not found");
  exit (0);
 }

 printf ("\n\nFile Created Successfully");

 printf ("\nNOTE: If you want to exit just press enter twice.\n\n");
 printf ("Enter Text : \n");

 while (strlen(gets(s)) > 0 )
 fputs (s,fp);

 fclose(fp);

 system("pause");
 return 0;
}

Sample Output

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display contents of a file on the screen using fgets function

Problem

Write a program that asks the user to input a file name. The program opens that file in read mode and displays it content on the screen. Use fgets function.

Solution - Code

#include<stdio.h>
#include<stdlib.h>
int main ()
{
 char a[10],a1[10],ch;
 FILE *fp,*ft;

 printf ("Enter file name : ");
 gets (a);

 fp = fopen (a,"r");

 if (fp == NULL)
 {
  printf ("Not found");
  exit (0);
 }

 while (1)
 {
  ch = fgetc(fp);
  if ( ch == EOF )
   break;
  printf ("%c",ch);
 }

 printf ("\n");
 system("pause");
}

Sample Output

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take input (from user) a poem and write it into a file using puts function

Problem

Write a C program that prompt the user to input a poem line by line. The program creates a file named poem.txt and writes that poem in that file. Use fputs function.

Solution - Code

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

int main()
{
 char s[80];
 FILE *ft;
 int i;

 printf ("NOTE: If you want to exit just press enter twice.\n\n");
 ft = fopen ("Poem.txt","w");

 printf ("Enter Poem : ");
 while (1)
 {

  gets(s);

  if (strlen(s) == 0)
   break;
  else
   fputs(s,ft);
 }

 fclose(ft);
 return 0;
}

Sample Output

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input characters (entered by the user) into a file using fputc function

Problem

Write a program that will take characters from the keyboard, one at a time, and writes them to a file. Use fputc function.

Solution - Code

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

int main()
{
 char ch;
 FILE *ft;
 int i;

 printf ("NOTE: If you want to exit, just press 1 and hit enter.\n\n");
 ft = fopen ("P3.txt","w");

 while (1)
 {
  printf ("Enter Character : ");
  scanf("%c",&ch);
  fflush (stdin);
  if ( ch == '1' )
   break;
  else
   fputc (ch,ft);
 }

 fclose (ft);
 system ("pause");
 return 0;
}

Sample Output

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create a copy of a file using fgetc and fputc functions

Problem

Write a program that creates a copy of a file. The program first asks the user to input the "first file name" whose copy should be created and "second file" name for copy file. Make sure that file exist with the name "first file name" in the same folder where your C program is present. Use fgetc and fputc functions.

Solution - Code

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

int main()
{
 char a[10],a1[10],ch;
 FILE *fp,*ft;

 printf ("Enter file name : ");
 gets (a);

 fp = fopen (a,"r");

 if (fp == NULL)
 {
  printf ("Not found");
  exit (0);
 }

 printf ("Enter file name : ");
 gets (a1);

 ft = fopen (a1,"w");
 if (ft == NULL)
 {
  printf ("Error in opening");
  exit (0);
 }

 while (1)
 {
  ch = fgetc(fp);
  if ( ch == EOF )
   break;
  else
   fputc (ch,ft);
  printf ("%c",ch);
 }

 fclose (fp);
 fclose (ft);

 system ("pause");
 return 0;
}

Sample Output

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display c source file on the console using fgetc function

Problem

Write a C program to open any C source file and displays its content on console. Use fgetc function.

Solution - Code

#include<stdio.h>
#include<conio.h>
#include<stdlib.h>
#include<string.h>
int main ()
{
 FILE *fp;
 char ch;

 fp = fopen ("p2.txt","r");

 while (1)
 {
  ch = fgetc(fp);
  if ( ch == EOF )
   break;

  printf ("%c",ch);
 }

 fclose (fp);
 system ("pause");
 return 0;
}

Sample Output

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