What is the return value of fgets?
The fgets() function returns a pointer to the string buffer if successful. A NULL return value indicates an error or an end-of-file condition. Use the feof() or ferror() functions to determine whether the NULL value indicates an error or the end of the file.
What does fgets return for a blank line?
NULL pointer
The return of fgets() contains the returned result of the function. If successful, the function returns a pointer to the NUL-terminated string of characters. If the function encounters end-of-file and reads no characters into the lineBuffer, it returns a NULL pointer.
What do both fgets () and gets () do?
gets() and fgets() are functions in C language to take input of string with spaces in between characters.
What does fgets do in C?
The fgets() function in C reads up to n characters from the stream (file stream or standard input stream) to a string str . The fgets() function keeps on reading characters until: (n-1) characters have been read from the stream. a newline character is encountered.
What is fgets and Fputs in C?
fgets() and fputs() functions In C Language. fgets() function reads string from a file pointed by file pointer. It also copies the string to a memory location referred by an array. fputs() function is useful when we want to write a string into the opened file .
How do I use fgets and Sscanf?
If you use fgets() + sscanf() , you must enter both values on the same line, whereas fscanf() on stdin (or equivalently, scanf() ) will read them off different lines if it doesn’t find the second value on the first line you entered.
Does fgets read?
fgets() won’t add a newline; it will include the newline that it read that marks the end of line. That way, you can tell whether you read the whole line or not.
How do I use fgets and Fscanf?
fgets reads to a newline. fscanf only reads up to whitespace. In your example, fgets will read up to a maximum of 9 characters from the input stream and save them to str , along with a 0 terminator. It will not skip leading whitespace.
What is Stdin in fgets in C?
fgets(string,size,stdin); In this example, string is the name of a char array, a string variable; size is the amount of text to input plus one, which should be the same size as the char array; and stdin is the name of the standard input device, as defined in the stdio. stdin is standard input.
Does fgets move the file pointer?
2 Answers. after using fgets(a,5,fp1) does the file pointer move 5 positions ahead? The pointer fp1 is not affected by the fgets call (or any other stdio I/O routine); The FILE object that fp1 points to will be updated to reflect the new file position, but the pointer itself does not change.
Does fgets overwrite the buffer?
fgets just like all other string functions that don’t specify otherwise overwrites the supplied buffer without checking what was in there before. So in other words, it writes to the beginning of the buffer.
What is Fseek and Ftell in C?
ftell() is used to store the current file position. fseek() is used to relocate to one of the following: A file position stored by ftell() A calculated record number ( SEEK_SET )
What happens to the fgets function in C?
Similarly, if the function terminates due to an EOF with no characters read, it returns a null pointer. NOTE: Although a newline character will force the fgets function to stop, it is still included in the string copied as a valid character. Let us illustrate how to use the fgets function in C. Consider the example code shown below:
When to return NULL pointer in fgets ( ) function?
On success, the function returns the same str parameter. If the End-of-File is encountered and no characters have been read, the contents of str remain unchanged and a null pointer is returned. If an error occurs, a null pointer is returned. The following example shows the usage of fgets () function.
What is the declaration for fgets ( ) in C?
Following is the declaration for fgets () function. str − This is the pointer to an array of chars where the string read is stored. n − This is the maximum number of characters to be read (including the final null-character). Usually, the length of the array passed as str is used.
Where does the null byte go in fgets ( )?
If a newline is read, it is stored into the buffer. A terminating null byte (‘\\0’) is stored after the last character in the buffer. And later. gets() and fgets() return s on success, and NULL on error or when end of file occurs while no characters have been read.