Variables and cin

Which of the following is a valid C++ variable name?

• my_variable

• 1var

• student name

• var1

Which of the following is a valid C++ keyword?

• int

• myvariable

• 123

• hello

Which of the following is a valid C++ comment?

• a. // This is a comment

• b. / This is a multi-line comment /

• c. # This is a comment

• Both a) and b)

What is the purpose of cin in C++?

• The purpose of 'cin' is to display output to the user.

• 'cin' is used to declare variables in C++.

• 'cin' is a function that performs calculations.

• The purpose of 'cin' in C++ is to read input from the user.

Which of the following correctly takes input for two integers a and b?

• cin(a, b);

• cin >> a >> b;

• cin << a, b;

• cin >> a, b;

Predict the Output

1. if input: x=4 y =7

• You entered: 7 and 4

• You entered: 4 and 7

• 13

• error

Which operator is used for assignment in C++?

• -=

• +=

• =

• ==

Write a program to take three integers as input and print their sum.

Write a program to take a person's name and age as input and print them.

How do you declare a constant variable in C++?Write a program that takes temperature in Celsius as input and converts it to Fahrenheit.

Formula:

To convert a temperature from Celsius to Fahrenheit, use the formula:

F=(C × 5/9​ )+32