12th Class Computer Science Chapter 14 Short Questions with Answers Online Preparation

Question # 1

Ans 1: A file pointer is a variable of type FILE that is defined in stdio.h. To obtain a file pointer variable, a statement like the following is used: FILE* fp;
Explanation :
We Know the symbol '*' as the arithmetic multiplication operator. But it has entirely different meaning when used with a data type such as int, double ,or FILE. It represents a pointer to the variable of type with which it is used e.gint* represents a pointer to an integer , float represents a pointer to afloat variable , and FILE * represents a pointer to a variable of type FILE. Conceptually, a pointer is a memory cell whose content is the address of another memory cell.

Question # 2

Ans 1: Stream: Avery important concept in C is the stream . A stream is a logical interface to a file. A stream is associated to a file using an open operation. Astream is disassociated from a file using a close operation.
Types:There are two types of stream:
- Text Stream
- Binary Stream
Ans 2:

Question # 3

Ans 1: When a program has no further use of file, it should close it with fclose(V ) library function.
Syntax:
int fclose (FILE* fp)

Question # 4

Ans 1: A binary system is a sequence of bytes with a one-to-one correspondence to those on the external device (I.e.,no translation occur). The number of bytes written or read is the same as the number on the external device.However, an implementation-defined number of bytes may be appended to a binary stream

Question # 5

Ans 1: Before reading from or writing to a file, it must be opened. All Standard file handling file handling function of C are declared in stdio.h. Thus it is include in almost every program. To open a file and associate it with a stream, the fopen( ) function is used. Its prototype is shown here:
File* fopen (const char * filename, const char* mode);

Question # 6

Ans 1: A text steam is a sequence of character . In a text stream, certain character translation may occur(e.g., a newline may be converted to a carriage return\line-feed pair). This means that there may not be one-to-one relationship between the characters written and those in the external device.

Question # 7

Ans 1: When a program has no further use of file , it should close it with fclose ( ) library .function
Syntax:
int fclose (FILE*fp)
The fclose() function closes the file associated with fp, which must be valid file pointer previously obtained using fopen ( ), and disassociates the stream from the file. It also destroys structure that was created to store information about file.

Question # 8

Ans 1: File Handling: A file represents a sequence of bytes on the disk where a group of related data is stored. File is created for permanent storage of data. It is a readymade structure.
In C Language, we use a structure pointer of file type to declare a file.
File *fp
Types of function: C provides a number of functions that helps to perform basic file operations.

Question # 9

Ans 1: Binary Stream:
- As Binary stream is a sequence of bytes.
- Translations do not occur.
- One-to-one relation is present
Ans 2: Text Stream:
- A text stream is a sequence of characters.
- Translations may occur.
- One-to-one relation is not present.