CBSE Coding Class 7 Solution – Variables in Real Life
CBSE Coding Class 7 Solution Student Handbook Chapter 1 Variables in Real Life all Questions and Answers Solution by Coding Teacher. Net Ex. Here provided all Coding Solution for Class 7.
1.) Process of assigning value to a variable before it is being used is called:
Answer: Initialization
Reason: Initialization is the process of assigning a value to a variable.
2.) int k1, k2 = 23 is an example of:
Answer: Variable declaration
Reason: A variable can be declared using the below syntax:
Datatype Variable Name = Value;
3.) Which of the following is NOT a correct variable name?
Answer: 2bad
Reason: Variable names cannot start with an integer, because it can cause some problems in the program.
4.) Which of the following declarations is NOT correct?
Answer: Double duty;
Reason: A variable declaration in programming must have expression.
5.) Which of the following shows the syntax of an assignment
statement?
Answer: Variable Name = expression;
Reason: The Basic Syntax of Assignment Statement in a programming language is:
variable = expression;
6.) What is an expression?
Answer: An expression is a combination of literals, operators, variables, and parentheses used to calculate a value.
Reason: An expression is a combination of values, variables, operators, and calls to functions. Expressions need to be evaluated.
7.) What is the value of the following expression?
(2 – 6) / 2 + 9
Answer: 7
Reason: First we solve the brackets and then divide it by 2 and then add
9 and result is 7.
Standard Questions
1.) What is variable initialization?
Answer: The process of assigning values in a variable at the time of declaration is called variable initialization. = symbol is used to initialize a variable. A single variable name must appear on the left side of the = symbol. All variables should be initialized to avoid any problem.
2.) What is the syntax to initialize a variable in programming?
Answer: A variable can be initialized using the below syntax:
Datatype Variable_Name = Value;
Example of declaring a variable in python
A = 34
B = “hello”
Here A is the variable name and 34 is the value assigned to that variable.
3.) Why do you think validating user input is important in programming?
Answer: Whenever we create a variable in with a specific data type we expect user to input a certain value in the data type but sometimes it could throw some error if the user enters a value of different data type and to avoid any error during program execution, we need to validate user input first.
4.) What are your opinions on naming convention of variables declared in programming? Write down five best practices that you think one should follow while declaring variables.
Answer: Naming conventions of variables are really important because while naming conventions provide us a set of rules for choosing a sequence of characters to identify variables. It helps us improve the clarity of the code and it looks more systematic.
Five best practices that you should follow:
There shouldn’t be any black space used in a variable.
The first character of a variable must be a letter or underscore.
Variables may not begin with a digit.
The max length of a variable should be up to 31 characters.
Both uppercase and lowercase letters can be used for naming variables.
Higher Order Thinking Skills (HOTS)
1.) Write a program to check if a String is palindrome or not.
Answer:
2.) Write a program to count the occurrence of the letter “a” in string “We are a family”.
Answer:
Applied Project
1.) Create a program in Arcade to display square of numbers from 1 to 10.
Fill in the blank nahi hai and true or false nahi hai