Thread: Need help with .txt file conversion

Hello !
I want to write a program, that reads from an existing .txt file
all capitals and convert them into small letters. After every sentence there should be a line-makeup and in one line there should be max. 80 characters....


Thats is the beginning of my code:

#include <stdio.h>

int main() {

FILE *f;
f=fopen("test.txt","r");
if (f==NULL)
printf("Fehler beim Öffnen");
...
...
...

fclose(f);

return 0;
}

Hi Hammer,
I think you hadn't understand me...Im a C newbie (sorry for my bad american english) and the prog I have to code is not very useful, I program a little bit C in school.

Here's my question again: (I hope it's better now)

I want to write a program, that reads from an existing .txt textfile
with a story all capitals like T from Tree and B from Bear and convert them into small letters to tree and bear.

Another thing must the programm do:
After every sentence there should be a line-makeup (\n) and in one line there should be max. 80 characters....

Thanks for help....

hi again...
can't you code it, PLEASE ?

Thats is the beginning of my code:

#include <stdio.h>

int main() {

FILE *f;
f=fopen("test.txt","r");
if (f==NULL)
printf("Fehler beim Öffnen");
...
...
...

fclose(f);

return 0;
}

Wow!!!! Really cool beginning!

Serious now:
Well, you have to read each character seperatily. You test if it is uppercase. If it is not capital you print it back unchanged, but if it is capital you make it lowercase and print it back. This is the first part which is easy. ( use functions: isupper, tolower )

Secondly:
f=fopen("test.txt","r");
should be:
f=fopen("test.txt","w+");

Third:
After every sentence there should be a line-makeup (\n) and in one line there should be max. 80 characters....
About the 80 characters we don't care. What should we do if there is a line with more 80 charcters? I don't know. You tell me nothing anout that... Besides, in my example you take charcter by character.
About the newline: You just test if the current character is '.'. If it is, you print back 2 characters: '.' , '\n'.

I hope i solved all your questions.
Good luck

Thanks for the comments. How can use this code with every textfile now ? When I write: programname < example.txt in my console.

PHP Code:

#include <stdio.h> 
#include <ctype.h> 

int main(void)
{
   char hello[] = "Hello World";
   char *p;
   
   printf ("Before conversion: %s\n", hello);

   for (p = hello; *p != '\0'; ++p)
   {
       *p = tolower(*p);
       ++p;
   }

   printf ("After conversion: %s\n", hello);

   return 0;   
} 


Hi
Your code has two mistakes
u have write ++p twice and this will cause the pionter to jump to time before make convert
here the code after editing


#include <stdio.h>
#include <ctype.h>

int main(void)
{
char hello[] = "HELLO WORLD";
char *p;

printf ("Before conversion: %s\n", hello);

for (p = hello; *p != '\0'; ++p)
{
*p = tolower(*p);

}

printf ("After conversion: %s\n", hello);

return 0;
}



out put :

Before conversion: HELLO WORLD
After conversion: hello world
Press any key to continue

one question: how can i make a new line after 80 characters ? with \n ???

thx to all and greetings from the other side of the ocean