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Data Structure

Question
CBSEENCO12011673
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Write a function REVCOL (int P[] [5], int N, int M) in C++ to display the content of a two-dimensional array, with each column content in reverse order.

Note: Array may contain any number of rows.

For example, if the content of the array is as follows:

15 12 56 45 51
13 91 92 87 63
11 23 61 46 81

The function should display output as:

11 23 61 46 81
13 91 92 87 63
15 12 56 45 51

 

Solution
void REVCOL(int P[][5],int N,int M)
{
	for(int I=0;I<N/2;I++)
	{
		for(int J=0;J<M;J++)
		{
			int T = P[I][J];
			P[I][J] = P[N­I­1][J];
			P[N­I­1][J] = T;
		}
	}
	for(I=0;I<N;I++)
	{
		for(int J=0;J<M;J++)
			cout<<P[I][J];
		cout<<endl;
	}
}​

Some More Questions From Data Structure Chapter

Write the definition of a member function INSERT() for a class QUEUE in C++, to insert an ITEM in a dynamically allocated Queue of items considering the following code is already written as a part of the program.

struct ITEM
{
	int INO; char INAME[20];
	ITEM *Link;
};
class QUEUE
{
	ITEM *R,*F;
	public :
	QUEUE() {R=NULL;F=NULL;}
	void INSERT();
	void DELETE();
	~QUEUE();
};

Write a definition for a function SHOWMID (int P[][5], int R, int C) in C++ to display the elements of the middle row and middle column from a two-dimensional array P having R number of rows and C number of columns. For example, if the content of the array is as follows:

115 112 116 101 125
103 101 121 102 101
185 109 109 160 172

The function should display the following as output :
103 101 121 102 101
116 121 109

 

A two-dimensional array P[20] [50] is stored in the memory along the row with each of its element occupying 4 bytes, find the address of the element [10] [30], if the element P[5] [5] is stored at the memory location 15000.

Write the definition of a member function Pop() in C++, to delete a book from a dynamic stack of TEXTBOOKS considering the following code is already included in the program.

struct TEXTBOOKS
{
	char ISBN[20]; char TITLE[80];
	TEXTBOOKS *Link;
};
class STACK
{
	TEXTBOOKS *Top;
public:
	STACK(){Top=NULL;}
	void Push();
	void Pop();
	~STACK();
};

Write a function REVCOL (int P[] [5], int N, int M) in C++ to display the content of a two-dimensional array, with each column content in reverse order.

Note: Array may contain any number of rows.

For example, if the content of the array is as follows:

15 12 56 45 51
13 91 92 87 63
11 23 61 46 81

The function should display output as:

11 23 61 46 81
13 91 92 87 63
15 12 56 45 51

 

Write a function ALTERNATE (int A[][3],int N,int M) in C++ to display all alternate element from two-dimensional array A (starting from A[0][0]).
For example:
If the array is containing:

23 54 76
37 19 28
62 13 19

The output will be:

23 76 19 62 19

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