Why you should not use scanf?

The problems with scanf are (at a minimum): using \%s to get a string from the user, which leads to the possibility that the string may be longer than your buffer, causing overflow. the possibility of a failed scan leaving your file pointer in an indeterminate location.

What is the difference between fgets and gets?

gets() reads a line from stdin into the buffer pointed to by s until either a terminating newline or EOF, which it replaces with a null byte (aq\0aq). No check for buffer overrun is performed. fgets() reads in at most one less than size characters from stream and stores them into the buffer pointed to by s.

What is the difference between scanf and Getch?

In brief, scanf and getchar are two functions available in C language. The main difference between scanf and getchar is that scanf is a formatted way of reading input from the keyboard while getchar reads a single character from the keyboard.

Is scanf C or C++?

The scanf() function in C++ is used to read the data from the standard input ( stdin ).

What can I use instead of scanf?

fgets() or gets() is a good alternative to scanf(),as it can accept incorrect input and allows the complier to execute the rest of the program. Yes there are but scanf is more effective. You can use getc for taking input as Character. And you can use gets for getting string as input.

How can I get input without scanf?

3 Answers. There aren’t functions to read integers and floats but you can use fgets with strtol for integers and strtof for floats: // floats: char str_f[20]; float f; fgets (str_f, 20, stdin); f = strtof(str_f, NULL); // integers: char str_i[20]; int i; fgets(str_i, 20, stdin); i = strtol(str_i, NULL, 0);

Is fgets and Scanf same?

There are multiple differences. Two crucial ones are: fgets() can read from any open file, but scanf() only reads standard input. fgets() reads ‘a line of text’ from a file; scanf() can be used for that but also handles conversions from string to built in numeric types.

Why scanf is faster than CIN?

Why is scanf faster than cin? On a high level both of them are wrappers over theread() system call, just syntactic sugar. The only visible difference is that scanf() has to explicitly declare the input type, whereas cin has the redirection operation overloaded using templates.

Is scanf vulnerable to buffer overflow?

Fortunately, it is possible to avoid scanf buffer overflow by either specifying a field width or using the a flag. Simply pass scanf an pointer to an unallocated variable of type char * , and scanf will allocate however large a buffer the string requires, and return the result in your argument.

What is the difference between scanscanf() and gets() in C++?

scanf () reads input until it encounters whitespace, newline or End Of File (EOF) whereas gets () reads input until it encounters newline or End Of File (EOF), gets () does not stop reading input when it encounters whitespace instead it takes whitespace as a string.

What is the use of scanscanf()?

scanf () 1 It is used to read the input (character, string, numeric data) from the standard input (keyboard). 2 It is used to read the input until it encounters a whitespace, newline or End Of File (EOF). More

What is the difference between scanf and gets in MS Access?

Using scanf or gets depends on the way to receive user input from the standard input which is the keyboard most of the time. scanf is more flexible than gets. You can download PDF version of this article and use it for offline purposes as per citation note.

What is the difference between sscanf and fgets?

Scanf does not perform bounds checking. fgets is likely going to be the better choice. You can then use sscanf() to evaluate it. For numeric types, scanf() does not need to do bounds checking. For string types, you can tell scanf() to do boundary checking.