Question

Can someone help me with this?

Create a mini program including a main() method and void methods where arrays are nxn i.e. same no. of rows & columns

1. displayArray(): Takes one parameter, a 2D symmetrical int array called "symmetric" & print the array as shown in the sample output.

2. shiftTheRowsBelow(): Takes one parameter, a 2D symmetrical int array called "symmetric". It will take the given values in the last row of the array, move them to the first row of the array, and shift all the other rows down by one.

P.S. Methods should be able to take in 2D integer arrays of any size & contents. The bottom row is transferred to the top & the one at the top is moved one below & so on.

Inside the main() i/p & o/p:

int[][] n =

{{20,40,60},

{25,45,65},

{30,40,50},

{35,45,55}};

        System.out.println("Prior Shift ");

displayArray(n);

shiftTheRowsBelow(n);

System.out.println("After the Shift ");

         displayArray(n);

O/P:

Prior shift

[20] [40] [60]

[25] [45] [65]

[30] [40] [50]

[35] [45] [55]

After the Shift

[35] [45] [55]

[20] [40] [60]

[25] [45] [65]

[30] [40] [50]

Answer 1

Source Code in Java:

class Matrix
{
static void displayArray(int symmetric[][]) //method to display the matrix
{
for(int i=0;i<symmetric.length;i++) //we use nested loops to print the 2D array
{
for(int j=0;j<symmetric[0].length;j++)
System.out.print(symmetric[i][j]+" ");
System.out.println();
}
}
static void shiftTheRowsBelow(int symmetric[][]) //method to shift the last row to the top and the other rows down
{
//we use an temporary 1D array to store the last row of the 2D array
int temp[]=new int[symmetric[0].length];
for(int j=0;j<symmetric[0].length;j++)
temp[j]=symmetric[symmetric.length-1][j];
//we transfer the rows down
for(int i=symmetric.length-1;i>=1;i--)
{
for(int j=0;j<symmetric[0].length;j++)
symmetric[i][j]=symmetric[i-1][j];
}
//we bring the last row stored in the 1D array to the top row
for(int j=0;j<symmetric[0].length;j++)
symmetric[0][j]=temp[j];
}
public static void main(String args[])
{
//testing the functions
int[][] n={{20,40,60},{25,45,65},{30,40,50},{35,45,55}};
System.out.println("Prior Shift ");
displayArray(n);
shiftTheRowsBelow(n);
System.out.println("After the Shift ");
displayArray(n);
}
}

Output: