How can i print the 4 lines from a file to a program? (c language )

Answer 1

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

int main(){
int count = 0;
char c = 0;
FILE * fp = fopen("file.txt","r");

if(fp){
while(c != EOF && count < 4){
c = getc(fp);
if( c == '\n' )
++count;
printf("%c",c);
}

fclose(fp);
}else
printf("Failed to open the file\n");

return 0;
}

Answer 2

No problem, I asked to be sure that you would not have problem on your interview :)

Error found !! Change type of i from char to int

Answer 3

Depends of the structure of the file !
It is the same exercise as reading a string but you read each characters from a file instead

Answer 4

Ok but I'll need more informations. How the student information is written in the file ?

Answer 5

I know @Madhuri, I am helping you the best I can :)
If you did not already changed what @~ swim ~ and I said, do it or it will not work ! :/

Answer 6

(a chat would have been useful in this case ...)

Answer 7

I'll correct your code and post it here

Answer 8

OK. thank you

Answer 9

thank you Baptiste

Answer 10

No, I know that, it is not what I mean. The path in my program is not the same as yours, so the first problem is that you will see no change in c:\\file.rec as I modify ./file.rec

Next is I changed the way to save/load from text to binary so if you open the file created, you will see something that has no sense while the data is here with no problem ! (as you cannot see the content of a binary file with a text editor)

Last is that you'll need to delete your current c:\\file.rec as it is a text file and not a binary file (don't worry, the program create it if it was not already)

Are binary files allowed for your interview ? I hope so, they are cleaner and safer ^^

Answer 11

we are really tankfull to you.baptiste.thank you so much..

Answer 12

thank you so much baptiste it worked

Answer 13

This is what I would do to read/save the file :
save :
FILE * fp = fopen("file.bin","wb");

if(fp){
fwrite(s1,sizeof(struct student),100,fp);
fclose(fp);
}

read :
same thing with two changes
wb -> rb
fwrite -> fread

It is a binary saving, but you cannot save pointers with this as the address will be freed at the end of the program. If you want to save a pointer, you'll have to save what it stores on saving and reallocate it on reading

Answer 14

You can, I never said you couldn't ^^
If you read the file and saved its informations in a student array, then it is way easier to manipulate than re reading the file each time.

Answer 15

https://code.sololearn.com/cb4v0E041ieo/?ref=app

Answer 16

It is normal, you can't run proper C on this platform ! I asked to tell me what was not working because I cannot go to my PC for now :/

Answer 17

Ok.... Lemme chk out

Answer 18

It is not in the good file as I changed the path for my computer (I am on linux)
The other point is that you will not be able to read it as it is a binary file, but your program still can read it

Sorry, I do not know what you mean by "storing in file only" :/

Answer 19

we are doing in windows codeblocks.
if i give the path it will store in that path and we cam access it

Answer 20

Actually its not mandatory for an interview...... If we make this student data base project it... I wld be definitely helpfull for us.... since mini projects give ur chances of getting selected is more