C File pro

Program to copy the contents of one file into another using fgetc and fputc function

#include

#include

#include

 void main()

{

   FILE *fp1, *fp2;

   char a;

   clrscr();

   fp1 = fopen("test.txt", "r");

   if (fp1 == NULL)

   {

      puts("cannot open this file");

      exit(1);

   }

   fp2 = fopen("test1.txt", "w");

   if (fp2 == NULL)

     {

      puts("Not able to open this file");

      fclose(fp1);

      exit(1);

   }

   do

     {

      a = fgetc(fp1);

      fputc(a, fp2);

   }

   while (a != EOF);

   fcloseall();

   getch();

}

Output

Content will be written successfully to file

Write a C program to read last n chatacters of the file using appropriate file function

#include

#include 

int main()

{

   FILE *fp;

   char ch;

   int num;

   long length;

   printf("Enter the value of num : ");

   scanf("%d", &num);

   fp = fopen("test.txt", "r");

   if (fp == NULL)

   {

      puts("cannot open this file");

      exit(1);

   }

   fseek(fp, 0, SEEK_END);

   length = ftell(fp);

   fseek(fp, (length - num), SEEK_SET);

    do

   {

      ch = fgetc(fp);

      putchar(ch);

   } while (ch != EOF);

   fclose(fp);

   return(0);

}

Output

Enter the value of n : 4

.com 

Compare two files in a C Programming

#include

#include

int main()

 {

   FILE *fp1, *fp2;

   int ch1, ch2;

   char fname1[40], fname2[40];

   printf("Enter name of first file :");

   gets(fname1);

   printf("Enter name of second file:");

   gets(fname2);

   fp1 = fopen(fname1, "r");

   fp2 = fopen(fname2, "r");

   if (fp1 == NULL)

  {

      printf("Cannot open %s for reading ", fname1);

      exit(1);

      }

      else if (fp2 == NULL)

      {

      printf("Cannot open %s for reading ", fname2);

      exit(1);

    }

    else

    {

      ch1 = getc(fp1);

      ch2 = getc(fp2);

       while ((ch1 != EOF) && (ch2 != EOF) && (ch1 == ch2)) {

         ch1 = getc(fp1);

         ch2 = getc(fp2);

      }

      if (ch1 == ch2)

         printf("Files are identical n");

      else if (ch1 != ch2)

         printf("Files are Not identical n");

       fclose(fp1);

      fclose(fp2);

   }

   return (0);

}

Copy Text From One File to Other File

#include

#include

#include

void main()

{

   FILE *fp1, *fp2;

   char ch;

   clrscr();

   fp1 = fopen("Sample.txt", "r");

   fp2 = fopen("Output.txt", "w");

    while (1)

    {

      ch = fgetc(fp1);

       if (ch == EOF)

         break;

      else

         putc(ch, fp2);

   }

    printf("File copied Successfully!");

   fclose(fp1);

   fclose(fp2);

}