Two Dimensional Arrays

Two Dimensional Arrays

-         Sometimes we need to store the data where more than one dimensions are involved, like sales information of a company, or for mathematical calculations we need to use matrix.

-         To declare a two-dimensional integer array of size i,j,  you would write something as follows:

-         Syntax:

Data-Type Variable-Name[row-size][col-size];

Where , Data-Type may be int, char or float,

Variable-Name represents name of the array,

Row-size indicate the number of row in table,

Col-size indicate the number of columns in an array.

-         Example:

                     int matrix[3][3];

-         In above example, int is a datatype and matrix is an array name. Here, the size of row is 3 and size of column is 3.

In above figure, the cell a[i][j] refers to the cell in ith row jth column.

So,

matrix[0][0]=10,

matrix[1][0]=20,

matrix[2][0]=30,

matrix[0][1]=40,

matrix[1][1]=50,

matrix[2][1]=60,

matrix[0][2]=90,

matrix[1][2]=80,

matrix[2][2]=70,

and like that.

So , solving mathematical problems involving matrices, we can use two dimensional array.

Write a C++ Program to demostrate character data type.

#include<iostream.h>

//using namespace std;

class Person

{

char name[30];

int age;

public:

void get_data(void);

void display();

};

void Person::get_data(void)

{

cout<<"Enter the name : ";

cin>>name;

cout<<"\nEnter the age : ";

cin>>age;

};

void Person::display(void)

{

cout<<"\nName : "<<name;

cout<<"\nAge : "<<age;

};

void main()

{

Person p;

p.get_data();

p.display();

}

Write a C++ Program to calculate average and sum.

#include<iostream.h>
//using namespace std;
void main()
{
float x,y,s,a;
cout<<"Enter the number : "<<"\n";
cin>>x>>y;
s=x+y;
a=s/2;
cout<<"\nSum = "<<s;
cout<<"\nAvg = "<<a;
}

OUTPUT:
Enter the number: 10
10
Sum = 20
Avg = 10

Basic Concepts of Array

Array:
One Dimensional Array - CLICK HERE