👉👉👉 Computer Science 12th Class Notes (Main Page)

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();
}

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

(National Book Foundation - As Federal Textbook Board, Islamabad 
Based on National Curriculum Pakistan 2023-2024 and Onward prescribed by Federal Board of Intermediate and Secondary Education, Islamabad, and All Pakistan Boards) 

{Contact WhatsApp # 03339719149 for Class-XII Computer Science Complete SLO-Based Key Points notes in pdf format as well as in PowerPoint Presentation for preparing/delivering the Lectures}👇👇👇👇👇👇👇👇👇👇

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👉👉👉 Computer Science 12th Class Notes (Main Page)

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(National Book Foundation - As Federal Textbook Board, Islamabad 
Based on National Curriculum Pakistan 2026-2027 and Onward prescribed by Federal Board of Intermediate and Secondary Education, Islamabad, and All Pakistan Boards) 

{Contact WhatsApp # +923339719149 for Class-XII Computer Science Complete SLO-Based Key Points notes in pdf format as well as in PowerPoint Presentation for preparing/delivering the Lectures}

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