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why all c++ program must have default constructor?
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To initialized objects of class, if you do not create your
own.Its a inbuilt feature of C++ compiler.
| Is This Answer Correct ? | 7 Yes | 1 No |
Answer / sourisengupta
When you create a Object with no arguments, the compiler automatically creates a default constructor internally. But when you use parameterized constructor in your code then you need to provide the default constructor in your code so that the compiler does not throw any errors at compile time.
It also depends on compiler. some compiler also supports this feature. then you do not need to write default constructor in the code.
| Is This Answer Correct ? | 5 Yes | 1 No |
Answer / rahin99435
The purpose of constructor is to initialize the class members and allocate necessary resources for them; at runtime.So by default C++ compiler is provided with a default constructor which performs the same job at runtime while the object is created.
There is provision of defining more than one constructor by changing the signatures to get objects of different kind.
| Is This Answer Correct ? | 2 Yes | 1 No |
Answer / jayakrishna
In c++ we have constructors for initialising the values for
the variables where destructors are present in order to
deallocate the the memory after completion of the work.
| Is This Answer Correct ? | 1 Yes | 1 No |
Answer / varsha
Default constructor and destructor gice compilers a place to
hide the code such as invocation of contructors of Base
classes and non static data members.
| Is This Answer Correct ? | 0 Yes | 1 No |
Answer / bhuvan singh
a defaulft constructor is created that takes no parameters
and does nothing.that takes no arguments but sets up your
object as required.
A defaulft constructor ,but by no convention so is any
constructor that takes parameters ,this is can be a bit confusing ,but is usually clear from context which one is meant.
A default constructor is not made by the compiler.so if u want a constructor that takes no parameters ,and u,ve created any others constructors ,u must make the default constructor urself.
"that if u make any constructor at all."
| Is This Answer Correct ? | 1 Yes | 5 No |
Board Coloring Problem Description In this problem you are given a board in which some of the elements are placed as shown in diagram below. Each element represents a color. Fill the other elements in the board, such that none of the adjacent elements (vertically, horizontally and diagonally) should be of the same color. Find out the minimum number of colors that should be used to fill the blank spaces in the board, so that the above condition is met. Color representation is -: 0, 1, 2, 3, 4, 5, 6, 7……………………. There is sample board: For Example: Given Board : Matrix representation of board is : [ _ 1 _ _ ] [ 2 _ _ _ ] [ _ _ 2 _ ] [ 2 _ _ _ ] here blank space is represented by '_' . Minimum colors to fill this board (given in the picture)is 4. Instruction to work with Open PBT Client: Specify the work directory path in the 'Work directory Path' field. The path should correspond to your solution Work directory. Download the support files by clicking the Get Dev Files. You will find the problem directories containing: problem.h file problem.c file in your project directory. Code the solution in.c file inside the problem directory All required files will be downloaded to your work directory. Creating additional files is strongly discouraged. Step 1: In your Solution File: Implement your logic in function int color(char board[4][4]) char board[4][4]board is 2 dimensional matrix of order M X M where M = 4. You can create more functions if required, but those functions should be in the same file. Step 2: In your solution keep in mind the following constraints. In this problem you have to write a program that finds the minimum number of colors needed to fill a board in which some of the elements are placed in advance. Function color() will take 2 dimension board as a input. Function color() returns the minimum number of colors that could fill the board meeting the given condition. Board is a 2 dimensional of M X M where M = 4 else return 0 Fill the other elements in the board, such that none of the adjacent elements (vertically, horizontally and diagonally) should be of the same color. The Prototype of the function is int color(char board[4][4]) This function takes following arguments. board is 2 dimensional matrix of order M X M where M = 4. This function returns minimum no of color by which board can be filled. The constraints are: Board is a 2 dimensional of M X M where M = 4 else return 0 Fill the other elements in the board, such that none of the adjacent elements (vertically, horizontally and diagonally) should be of the same color. Example 1 Input { 2 0 _ 1 } { _ 1 _ _ } { _ 2 _ 0 } { _ _ _ 1 } Output 5 Explanation: We need a minimum 5 different colors to complete the board. Example 2 Input { 2 0 _ 1 3} { _ 1 _ _ 2} { _ 2 _ 0 1} { _ _ _ 1 2} { _ _ _ _ 0} Output 0 Explanation: Size of the board is greater than 4X4. Example 3 Input { _ 0 } { 1 _ } Output 0 Explanation: Size of the board is less than 4X4. For C solutions Header File : boardcoloring.h Function Name : int color(char board1[4][4]) File Name : boardcoloring.c For C++ solutions Header File : boardcoloring.h Class Name : BoardColoring Function Name : int color(char board1[4][4]) File Name : boardcoloring.c
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