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Showing content from https://www.cplusplus.com/reference/cstdio/fgets/ below:

function

fgets

char * fgets ( char * str, int num, FILE * stream );

Get string from stream

Reads characters from stream and stores them as a C string into str until (num-1) characters have been read or either a newline or the end-of-file is reached, whichever happens first.

A newline character makes fgets stop reading, but it is considered a valid character by the function and included in the string copied to str.

A terminating null character is automatically appended after the characters copied to str.

Notice that fgets is quite different from gets: not only fgets accepts a stream argument, but also allows to specify the maximum size of str and includes in the string any ending newline character.

Parameters

str: Pointer to an array of chars where the string read is copied.
num: Maximum number of characters to be copied into str (including the terminating null-character).
stream: Pointer to a FILE object that identifies an input stream.
stdin can be used as argument to read from the standard input.

Return Value On success, the function returns str.
If the end-of-file is encountered while attempting to read a character, the eof indicator is set (feof). If this happens before any characters could be read, the pointer returned is a null pointer (and the contents of str remain unchanged).
If a read error occurs, the error indicator (ferror) is set and a null pointer is also returned (but the contents pointed by str may have changed).

Example

/* fgets example */
#include <stdio.h>

int main()
{
   FILE * pFile;
   char mystring [100];

   pFile = fopen ("myfile.txt" , "r");
   if (pFile == NULL) perror ("Error opening file");
   else {
     if ( fgets (mystring , 100 , pFile) != NULL )
       puts (mystring);
     fclose (pFile);
   }
   return 0;
}

This example reads the first line of myfile.txt or the first 99 characters, whichever comes first, and prints them on the screen.

See also

fputs: Write string to stream (function)

fgetc: Get character from stream (function)

gets: Get string from stdin (function)

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