How does fgets () work in C?

C library function – fgets() The C library function char *fgets(char *str, int n, FILE *stream) reads a line from the specified stream and stores it into the string pointed to by str. It stops when either (n-1) characters are read, the newline character is read, or the end-of-file is reached, whichever comes first.

Can we use fgets in C?

fgets() and gets() in C language For reading a string value with spaces, we can use either gets() or fgets() in C programming language.

How do I use fgets?

Syntax: char *fgets(char *str, int n, FILE *fp); The function reads a string from the file pointed to by fp into the memory pointed to by str . The function reads characters from the file until either a newline ( ‘\n’ ) is read or n-1 characters is read or an end of file is encountered, whichever occurs first.

Why the length of string is +1 in fgets?

If a newline is read, it is stored into the buffer. A terminating null byte (aq\0aq) is stored after the last character in the buffer. So it adds ‘\n’ after your 4 letters, returning string_length+1 .

What is difference between fgets and gets in C?

gets() keeps reading input until newline character or end-of-file(EOF) shows up. This can lead to buffer overflow as it doesn’t check array bounds of variable. While in case of fgets() it will also stop when maximum limit of input characters is reached.

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.

How do I use fgets in array?

The fgets function reads characters from the specified stream and store into the character array. It reads only n-1 character, where n is the specified number of characters. It stops the reading when read newline character or (n-1) character, or encounter end-of-file.

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.

Which is better fgets or gets?

fgets() is a safer version of gets() where you can provide limitation on input size. You can also decide to take input from which stream(e.g. File or standard input). Let’s say our input is, Note The fgets() includes the terminating character in the buffer and because of that the string has 14 characters of our input.

How to use substring function in C?

You can use Substring method to find a substring between two strings. First, you need to find the position of the two strings in the string. Then use first string position as the starting position and find the length of the string by subtracting position of the first string from the position of the second string.

What is getchar function in C?

c Programming/stdio.h/getchar. getchar is a function in C programming language that reads a single character from the standard input stream stdin, regardless of what it is, and returns it to the program. It is specified in ANSI-C and is the most basic input function in C. It is included in the stdio.h header file.

What is reentrant function in C?

Reentrant Function. A function is said to be reentrant if there is a provision to interrupt the function in the course of execution, service the interrupt service routine and then resume the earlier going on function, without hampering its earlier course of action.

What is FSEEK in C?

fseek is a C function belonging to the ANSI C standard library, and included in the file stdio.h. Its purpose is to change the file position indicator for the specified stream. Because fseek uses 32 bit values on many platforms it has a limitation of maximum 2 gigabyte seeks.