Reading string by char till end of line C C

Question

How to read a string one char at the time  and stop when you reach end of line  I am using fgetc function to read from file and put chars to array  latter will change array to malloc   but can t figure out how to stop when the end of line is reached  Tried this  c is the variable with char from file    if c    0     But it gives error that I cant compare pointer to integer   File looks like  the length of the words are unknown    one two three   So here comes the questions  1  Can I compare c with  0 as  0 is two symbols    and 0  or is it counted as one  same question with  n  2  Maybe I should use  n   3  If suggestions above are wrong what would you suggest  note I must read string one char at the time    Note I am pretty new to C   and programming it self

User · Accepted Answer

You want to use single quotes   if c    0     Double quotes     are for strings  which are sequences of characters   Single quotes     are for individual characters   However  the end-of-line is represented by the newline character  which is   n    Note that in both cases  the backslash is not part of the character  but just a way you represent special characters   Using backslashes you can represent various unprintable characters and also characters which would otherwise confuse the compiler

User · Answer

A text file does not have  0 at the end of lines  It has  n    n is a character  not a string  so it must be enclosed in single quotes  if  c      n

User · Answer

The answer to your original question     How to read a string one char at the time  and stop when you reach end of line    is  in C    very simply  namely  use getline   The link shows a simple example    include  lt iostream gt   include  lt string gt  int main        std  string name    std  cout  lt  lt   Please  enter your full name       std  getline  std  cin name     std  cout  lt  lt   Hello     lt  lt  name  lt  lt     n     return 0      Do you really want to do this in C   I wouldn t   The thing is  in C  you have to allocate the memory in which to place the characters you read in   How many characters   You don t know ahead of time   If you allocate too few characters  you will have to allocate a new buffer every time to realize you reading more characters than you made room for   If you over-allocate  you are wasting space   C is a language for low-level programming   If you are new to programming and writing simple applications for reading files line-by-line  just use C     It does all that memory allocation for you   Your later questions regarding   0  and end-of-lines in general were answered by others and do apply to C as well as C     But if you are using C  please remember that it s not just the end-of-line that matters  but memory allocation as well   And you will have to be careful not to overrun your buffer

User · Answer

If you are using C function fgetc then you should check a next character whether it is equal to the new line character or to EOF  For example  unsigned int count   0  while   1        int c   fgetc  FileStream        if   c    EOF    c      n               printF   The length of the line is  u n   count          count   0        if   c    EOF   break          else              count               or maybe it would be better to rewrite the code using do-while loop  For example  unsigned int count   0  do      int c   fgetc  FileStream        if   c    EOF    c      n               printF   The length of the line is  u n   count          count   0          else              count         while   c    EOF      Of course you need to insert your own processing of read xgaracters  It is only an example how you could use function fgetc to read lines of a file   But if the program is written in C   then it would be much better if you would use std  ifstream and  std  string classes and function std  getline to read a whole line

[c++] Reading string by char till end of line C/C++

Examples related to c++

Examples related to c

Examples related to string

Examples related to file

Examples related to fgetc