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Solutions for Chapter 4: Constructors
Below listed, you can find solutions for Chapter 4 of CISCE Rupa Pandit for कंप्युटर एपलीकेशंस [अंग्रेजी] कक्षा १० आईसीएसई.
Rupa Pandit solutions for कंप्युटर एपलीकेशंस [अंग्रेजी] कक्षा १० आईसीएसई 4 Constructors Exercises [Pages 114 - 116]
Choose the correct option.
A constructor gets activated when ______.
it is invoked
an object of the class is created
the program is compiled
never
The return type of a constructor is:
none
void
int
double
The name of a constructor is:
same as the class name
different from the class name
supposed to be a keyword
must be written in uppercase
Multiple constructors with different set of parameters are called:
multiple constructors
formal constructors
actual constructors
overloaded constructors
When a program does not contain any constructor, Java compiler provides:
a Null constructor
an overloaded constructor
a default constructor
a parameterized constructor
Fill in the blanks.
A constructor has the ______ (same/different) name as that of the class.
A constructor ______ (does/doesn't) have any return type.
A constructor ______ (can/cannot) be called as other functions.
A constructor has ______ return type.
When a program does not contain any constructor, java compiler provides a ______ (default/parameterized) constructor.
What is a constructor?
State two features of a constructor.
Answer the following in brief. Give a program code example wherever applicable.
What is the use of a default constructor?
Answer the following in brief. Give a program code example wherever applicable.
What is a parameterised constructor?
Answer the following in brief. Give a program code example wherever applicable.
Can constructors be overloaded?
Answer the following in brief. Give a program code example wherever applicable.
Constructors cannot be called. Then when do they get executed?
State the difference between constructor and method.
Write a program for the following.
Define a class Store, described as below:
| Data Members: income (double), expenditure (double), net (double) | ||
| Member Methods: | ||
| (i) | Store() | constructor to initialize member data to null. |
| (ii) | Input() | to input values for member data income and expenditure. |
| (iii) | Procedure() | to calculate value of net using the following formula net = income - expenditure. |
| (iv) | Display() | to display all the member data. |
| Write a main() method to create an object of the class and call the above member methods. | ||
Write a program for the following.
Define a class Numeral, described as below:
| Data Members: | ||
| num (int) | ||
| Member Methods: | ||
| (i) | Numeral() | constructor to initialize member data to null. |
| (ii) | Numeral() | to accept a value for the member data from the user. |
| (iii) | Numeral() | to calculate and return the value of summation of num where- (Summation of num) = 1+2+3+ ... + num |
| (iv) | int SumDigit() | to calculate and return the sum of the digits of num. |
| (v) | Display() | To display the member data and also to invoke member methods Summation() and SumDigit() and print their return values. |
| Write a main() method to create an object of the class and call the above member methods. | ||
Write a program for the following.
Define a class Annual, described as below:
| Data Members: | ||
| costPrice (int), sellPrice (int), profit (int), profitPct (double) | ||
| Member Methods: | ||
| (i) | Annual(int cp, int sp) | constructor to initialize member data CostPrice to cp and SellPrice to sp and rest to null. |
| (ii) | Calculate() | to calculate the profit and profitPct using the formula profit = sellPrice - costPrice and |
| (iii) | Display() | to display all the member data. |
| Write a main() method to create an object of the class and call the above member methods. | ||
Write a program for the following.
Define a class Mortgage, described as below:
| Data Members: | ||
| loan (int), time (double), rate (double), interest (double), repay (double) | ||
| Member Methods: | ||
| (i) | Mortgage(int p, | constructor to initialize member data - loan to p, double r, double t) rate to r, time to t and rest to null. |
| (ii) | Estimate() | to calculate the Interest using the formula interest = (loan * rate * time )/100 and also to calculate Amount to Repay using the formula repay = loan + interest. |
| (iii) | Display() | to display all the member data. |
| Write a main() method to create and object of the class and call the above member methods. | ||
Activity:
Constructors can be applied to all the programs that contain member data. Upgrade the programs done till now, so as to include constructors in them.
Solutions for 4: Constructors
Rupa Pandit solutions for कंप्युटर एपलीकेशंस [अंग्रेजी] कक्षा १० आईसीएसई chapter 4 - Constructors
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