5.2.3. Accessing and Writing a 2D array, Chapter - 5, Arrays and String, HSSC-II (12th Class) Computer Science Key Point Notes

12th Class (HSSC-II) Computer SLO Based Key Point Notes

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Unit 5: Arrays and String

5.2.3. Accessing and Filling a 2D array

2D arrays are generally accessed row by row using a nested loop. The row index is used as the outer loop variable and the column index as the inner loop variable.

For example to fill an array using the cin function:

        int demo[3][2];
        for( i=0;i<3;i++ )
        {
                    for( j=0;j<2;j++ )
                    {
                    cin>>demo[ i ][ j];
                    }
        }

Example 1:

• Write a program that reads integer values in an array of 3 rows and 4 columns and finds the sum of all the values.

#include <iostream.h>
#include <conio.h>
void main()
{
        clrscr();
        int k[3][4], sum=0;
        for(int i=0; i<=2; i++)
        {
                    for(int j=0; j<=3; j++)
                    {
                    out<<“Enter a number: “;
                    cin>>k[i][j];
                    }
        }
        for(int a=0; a<=2; a++)
        {
                    for(int b=0; b<=3; b++)
                        sum = sum + k[a][b];
        }
        cout<<“Sum of all values is: “<<sum<<endl;
        getch();
}

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5.1. Introduction to Arrays:

5.1.1 Comcept of an Array:

5.1.2. Declaring (defining) an Array

5.1.3. Initialization of Array

5.1.4. Using Arrays in Programs:

5.1.5. The Sizeof() Function

5.2.1. Introduction of Two-Dimensional Arrays

5.2.2. Defining and Initializing a Two-Dimensional Array:

5.2.3. Accessing and Filling a 2D array

5.3.1 Introduction to Strings

5.3.2 Defining (declaration) a String

5.3.2 Initializing a String

5.4 Commonly used String Function

Chapter 5 (Complete Key Point Notes)

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