Avichal solutions for Computer Applications [English] Class 10 ICSE chapter 1.5 - Input in Java [Latest edition]

What is the purpose of the following function?

nextInt()

What is the purpose of the following function?

nextLine()

Predict the output in the following case:

Math.sqrt (−36)

Predict the output in the following case:

Math.pow(−4, 3);

Why do you need to mention the keyword import in the program? 

What happens when the value of a variable is divided by zero? 

What happens when semicolon is missing in an input/ output statement? 

Name the method of scanner class that is used to input a decimal number from the console.

Name the method of scanner class that is used to input a word or text of a line from the keyboard. 

Which of the following is the right way to use a comment in Java program? 

Given: int p=55/0; 

Name the type of error in the given statement: 

The ______ method will accept a character using stream class. 

Which of the following method will accept a string by using scanner object? 

Which of the following is a method of Java Scanner class? 

The package needed to import StrearnReaderclass is ______.

______ function accepts an integer by using scanner object. 

The package needed to import Scanner class is ______.

The keyword ______ is used to include a package in a program. 

Assigning a value of 24.3 to a variable that is defined as int type is ______ error. 

______ statement is used to accept value at runtime. 

Scanner ob = ______ Scanner(______). 

The command line argument accepts the data value as an ______ of strings.

Explain the following function:

Integer.parseint(in.readLine( )); 

Explain the following function:

(char)(in.read()); 

Explain the following function:

next();

Explain the following function:

public static void main( int b );

Explain the following function:

nextLine();

What are the different ways to give input in a Java Program? 

What is meant by a package? 

Give an example of a package.

What is the use of the keyword 'import' in Java programming? 

What is a Runtime error? Explain with an example. 

What are the different types of errors that take place during the execution of a program? Name them. 

Give two differences between Syntax error and Logical error. 

In an election, there are two candidates X and Y. On the election day, 80% of the voters go for polling, out of which 60% vote for X. Write a program to take the number of voters as input and calculate:

1. number of votes received by X.
2. number of votes received by Y. 

A shopkeeper offers 10% discount on the printed price of a mobile phone. However, a customer has to pay 9% GST on the remaining amount. Write a program in Java to calculate the amount to be paid by the customer taking printed price as an input. 

A man spends `1/2` of his salary on food, `1/15` on rent, `1/10` on miscellaneous activities. Rest of the salary is his saving. Write a program to calculate and display the following:

1. money spent on food
2. money spent on rent
3. money spent on miscellaneous activities
4. money saved

Take the salary as an input.

Write a program to input time in seconds. Display the time after converting them into hours, minutes and seconds. 

Sample Input: Time in seconds: 5420
Sample Output: 1 Hour 30 Minutes 20 Seconds

The driver took a drive to a town 240 km at a speed of 60 km/h. Later in the evening, he drove back at 20 km/h less than the usual speed. Write a program to calculate: 

1. the total time taken by the driver
2. the average speed during the whole journey

[Hint: average speed = `"total distance"/"total time"`] 

Write a program to input two unequal numbers. Display the numbers after swapping their values in the variables without using a third variable. 

Sample Input: a = 76, b = 65
Sample Output: a = 65, b = 76

A certain amount of money is invested for 3 years at the rate of 6%, 8% and 10% per annum compounded annually. Write a program to calculate: 

1. the amount after 3 years.
2. the compound interest after 3 years.

Accept certain amount of money (Principal) as an input.

Hint: A = P * `(1 + ("R"1)/100)^"T"` * `(1 + ("R"2)/100)` * `(1 + ("R"3)/100)` and CI = A − P

The coordinates of two points A and B on a straight line are given as (x1, y1) and (x2, y2). Write a program to calculate the slope (m) of the line by using formula: 

Slope = `((y2 − y1))/((x2 − x1))`

Take the coordinates (x1, y1) and (x2, y2) as input. 

A dealer allows his customers a discount of 25% and still gains 25%. Write a program to input the cost of an article and display its selling price and marked price.

[Hint: SP = `((100 + p%)/100)` * CP and MP = `(100/(100 − d%))` * SP]