C Programming Week 13

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Questions and Answers

What function is used to read a character from a file?

fputs

fgetc (correct)

putw

fprintf

Which function would correctly write an integer value to a file?

fprintf

fgets

putw (correct)

fputc

What is the purpose of the `fgets` function?

To read a string from a file (correct)

To write a string to a file

To read a character from a file

To write an integer to a file

If you want to write an array to a file, which function could you use?

fwrite Signup and view all the answers

What is required as a parameter when using `fprintf`?

File pointer, format string, and values to write Signup and view all the answers

What will the following code do: `size_t fwrite(arr, sizeof(arr), 1, fp);`?

It writes the entire arr to fp Signup and view all the answers

If the file pointer `fp` opens a file successfully, what does its value indicate?

The file exists and is ready for operations Signup and view all the answers

What does the following structure define: `struct record { char name; int roll; float marks; } student;`?

A single record of student details Signup and view all the answers

What is the return type of the `fgetc` function?

int Signup and view all the answers

What does the `putw` function do?

Writes an integer to a file Signup and view all the answers

When using `fwrite`, what does the second parameter represent?

The size of the data type being written Signup and view all the answers

What type of variable is `size_t` defined as?

unsigned int Signup and view all the answers

In the statement `fprintf(fp, 'My age is %d', age);`, what does `%d` signify?

Displays a decimal number Signup and view all the answers

What can be concluded if `fp` is NULL after the `fopen` call?

An error occurred when opening the file Signup and view all the answers

What does `fgets` return when it reaches the end of the file without reading any characters?

NULL Signup and view all the answers

In the `struct record`, what data type is used for the `marks` field?

float Signup and view all the answers

Which of the following correctly describes what the `fgetc` function returns?

The next character from the specified file, or EOF on end of file. Signup and view all the answers

When using the `fscanf` function, which of the following would be incorrect?

Providing an invalid format specifier. Signup and view all the answers

What is the role of the first parameter `ptr` in the `fwrite` function?

It points to the data to be written to the file. Signup and view all the answers

What will happen if a file pointer `fp` is obtained successfully using `fopen`?

The pointer will reference the opened file for reading/writing. Signup and view all the answers

In the declaration `typedef unsigned int size_t;`, what does `size_t` represent?

An integer that can be used to represent memory sizes. Signup and view all the answers

When the statement `putw(value, ptr);` is executed, what happens?

An integer value is written to the file. Signup and view all the answers

What is expected from the `fgets` function when it reaches the end of a file without reading any characters?

It returns an empty string. Signup and view all the answers

Which of the following best describes what the `struct record` contains?

It specifies a record type with fields for name, roll, and marks of a student. Signup and view all the answers

Is Egor gay?

True Signup and view all the answers

Study Notes

File Operations

Functions for file input/output (I/O) are described
Character I/O functions include fputc and fgetc
Integer I/O functions include putw and getw
String I/O functions include fputs and fgets
Formatted I/O functions include fprintf and fscanf
Block read/write functions include fwrite

Understanding `fwrite()`

A struct record is defined, holding data like name, roll, and marks
Program example shows how to use fwrite() to write data to a file

Randomly Accessing Files

fseek() function for moving the file pointer
Constants like SEEK_SET, SEEK_CURRENT, and SEEK_END control the origin of the displacement
ftell() to get the current file position
rewind() to move the file pointer to the beginning
perror() for error messages
rename(), unlink(), remove() for file management
fflush() to flush buffers

Temporary Files

tmpfile() creates a temporary file opened in "wb+" mode
tmpnam() generates a unique filename
freopen() associates a new file with a file pointer

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Description

This quiz covers essential file operations and I/O functions in C programming, including character, integer, string, and formatted I/O functions. It also explores file management functions, random access with fseek(), and temporary file handling using tmpfile(). Test your understanding of these critical concepts in file handling and manipulation.

C Programming Week 13

Choose a study mode

Podcast

Questions and Answers

What function is used to read a character from a file?

Which function would correctly write an integer value to a file?

What is the purpose of the fgets function?

If you want to write an array to a file, which function could you use?

What is required as a parameter when using fprintf?

What will the following code do: size_t fwrite(arr, sizeof(arr), 1, fp);?

If the file pointer fp opens a file successfully, what does its value indicate?

What does the following structure define: struct record { char name; int roll; float marks; } student;?

What is the return type of the fgetc function?

What does the putw function do?

When using fwrite, what does the second parameter represent?

What type of variable is size_t defined as?

In the statement fprintf(fp, 'My age is %d', age);, what does %d signify?

What can be concluded if fp is NULL after the fopen call?

What does fgets return when it reaches the end of the file without reading any characters?

In the struct record, what data type is used for the marks field?

Which of the following correctly describes what the fgetc function returns?

When using the fscanf function, which of the following would be incorrect?

What is the role of the first parameter ptr in the fwrite function?

What will happen if a file pointer fp is obtained successfully using fopen?

In the declaration typedef unsigned int size_t;, what does size_t represent?

When the statement putw(value, ptr); is executed, what happens?

What is expected from the fgets function when it reaches the end of a file without reading any characters?

Which of the following best describes what the struct record contains?