Fbise Notes-Computer

INPUT AND OUTPUT HANDLING CH# 03

Questions and Answers

Short Questions

i. Why format specifier is used? Explain with examples.

Ans: Format Specifier:

A format specifier is computer code that tells about the data type, field width and the format according to which a value is to be read or printed. Commonly used format specifiers are;

i. %d decimal integer

ii. %i integer

iii. %f floating-point

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ii. Why escape sequence is used? Explain with examples.

Ans: Escape Sequence:

The special characters used in C language to control printing on the output device are called escape sequence. These characters are not printed, and used inside the control string.

It is a combination of a backslash(\) and a code character. Commonly used escape sequence are;

i. \a produces alert (bell) sound.

ii. \b moves cursor backward.

iii. \n moves cursor to the beginning of next line.

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iii. What is the purpose of gets() function? Explain with an example.

Ans: gets() Function:

The gets() function is used to read a string from the keyboard and store it in the variable specified inside the parenthesis.

Example:

#include<stdio.h>

void main (void)

{

char name[20];

printf(“\nEnter your name:”);

gets(name);

printf(“\nMy name is %s”,name);

getch();

}

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iv. Differentiate between getch( ) and getche( ) functions.

Ans: getch() Function:

The getch() is similar to getche(), the difference is that it does not display the typed character to the screen. The function require conio.h header file.

getche() Function:

The getche() reads a single character from the keyboard and it is assigned to the variable. The format specifier %c print the letter stored in variable. The ‘get’ means get something from input device. The ‘ch’ means it get a character and ‘e’ means it echoes (display) the character to the screen.

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