Variable Input Output C Language

As you have in previous chapter what is a variable now I am going to demonstrate that how to declare and read/write into a variable.

Declaration syntax

Declare single variable

Data_type Variable_name;

Declare more than one variable

Data_type Var_name1,var_name2…var_nameN

Declare and initialize

Data_type var_name1=val1,var_name2=val2…var_nameN=valM

Variable Declaration

When you make a variable. It’s known as declaration in terms of C language. Declaration request OS for claiming space on physical memory.

Initialization

First value assign to a variable after declaration. What if you didn’t initialize a variable then an unpredicted value assigned which is known as garbage so initialization   is mandatory for denied facing socking result.

January, 2016 A8-R4: BASICS OF OS, UNIX & SHELL PROGRAMMING

January, 2016

A8-R4: BASICS OF OS, UNIX & SHELL PROGRAMMING

PART ONE

(Answer all the questions)

1. Each question below gives a multiple choice of answers. Choose the most appropriate one and enter in the “OMR” answer sheet supplied with the question paper, following instructions therein. (1x10)

1.1 What does the following command do?
who | wc –l
A) List the number of users logged in
B) List the users
C) List the number of users in the system
D) Display the content of who command
1.2 What is the default number of files open per user process?
A) 0
B) 1
C) 2
D) 3
1.3 $ oneko &

NIELIT Assignment 12 : Basics of Os, Unix and Shell Programming

Assignment 12

a) Write a command to change modification time of a file without modifying the
file.

b) Write a command to display name of a file in your current directory whose
size is maximum.

NIELIT Assignment 11 : Basics of Os, Unix and Shell Programming

Assignment 11.

a) Write a command to convert contents of a file a.txt to upper case

b) Write sequence of commands to convert 1st line of a file a.txt to upper case