C programming A palindrome is a word that reads the same forward as it does back

Question

C programming

A palindrome is a word that reads the same forward as it does backward. An example of a valid palindrome is the word “racecar”. An example of a word that is not a palindrome is “trust” (it reads backwards as “tsurt”). Develop a C program that identies palindrome words. Your program should:
• Read words to be checked from a le called input.txt (You can nd this le on the course website).
• If a word is a palindrome it prints it to a le named palindromes.txt

I can use strings and arrays,if comments could be added to de code, would be great so i can follow and understand it.

I hope someone can help me, thank you.

The input FILE contains this words:

chool
aibohphobia
lists
alula
bake
cammac
civic
read
deified
late
absent

Explanation / Answer

/**C program that reads as input.txt file and reads words from the file. Then finds the palindrome words and write those palindrome words
to a new text file "palindromes.txt" file */

//palindromes.c
#include<stdio.h>
#include<cstdlib>
#include<conio.h>
#include<string.h>
//function prototype
bool isPalindrome(char word[]);
int main()
{

   //character string
   char word[100];
   char fileName[50]="input.txt";

   //open a file input.txt
   FILE *fp=fopen(fileName,"r");

   //check file exists or not
   if(!fp)
   {
       printf("File doesnot exist.");
       getch();
       exit(0);
   }

   //open a output file "palindromes.txt"
   FILE *fwrite=fopen("palindromes.txt","w");

   //write palidrome words to file
   while(fscanf(fp,"%s",word)!=EOF)
   {      
       //check for palindromes
       if(isPalindrome(word))
           fprintf(fwrite, "%s ",word);

   }
   //close the file objects
   fclose(fp);
   fclose(fwrite);

   printf("enter key to close");
   getch();
   return 0;
}

//Returns true if the word is palindrome otherwise returen false
bool isPalindrome(char word[])
{

   char rev[100];
   //copy the char string to re
   strcpy(rev,word);
   //reverse string
   strrev(rev);
   //compare two string
   return strcmp(word,rev)==0;
}

--------------------------------------------------------------------------------

Sample input.txt

chool
aibohphobia
lists
alula
bake
cammac
civic
read
deified
late
absent

---------------------------------------------------------------------------------------

Sample output palindromes.txt

aibohphobia
alula
cammac
civic
deified

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