Answer:
import java.util.Scanner;
import java.lang.*;
public class Main
{
//variables declared static; to be used inside main()
static int err;
static int size=10;
//arrays declared static; to be used inside main()
static int[][] white = new int[size][size];
static int[][] black = new int[size][size];
//method to recognize any errors in the image
static int recognition(int[][] img)
{
//variable to indicate any error
int notImage=0;
if(img[1][1]==0)
{
for(int l=0;l<size; l++)
{
for(int k=0;k<size; k++)
{
if(img[l][k]!=0)
notImage++;
}
}
}
else
{
for(int l=0;l<size; l++)
{
for(int k=0;k<size; k++)
{
if(img[l][k]!=1)
notImage++;
}
}
}
if(notImage!=0)
return -1;
else
return 0;
}
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.println("Enter the elements for 2d black array of size 10(enter 0): ");
for(int l=0;l<size; l++)
{
for(int k=0; k<size; k++)
{
white[l][k]=sc.nextInt();
}
}
System.out.println("Enter the elements for 2d white array of size 10(enter 1): ");
for(int l=0;l<size; l++)
{
for(int k=0; k<size; k++)
{
black[l][k]=sc.nextInt();
}
}
err = recognition(white);
if(err==-1)
System.out.println("White image has errors.");
else
System.out.println("White image does not has errors.");
err = recognition(black);
if(err==-1)
System.out.println("Black image has errors.");
else
System.out.println("Black image does not has errors.");
}
}
OUTPUT
Program tested for smaller sizes.
Explanation:
1. Two two dimensional integer arrays are declared.
2. The variable size is declared and initialized to 10.
3. The main() prompts the user to enter the elements for both arrays; 1 for white and 0 for black.
4. Both the arrays are initialized inside two for loops independently.
5. These arrays are passed as parameter to the method, recognition(), one at a time.
6. Inside recognition(), an integer variable, notImage is declared and initialized to 0. If any other integer, other than 0 or 1 is encountered in the respective arrays, this variable is initialized to -1.
7. Inside main(), an integer variable, err, is declared. This variable stores the value returned by recognition().
8. Depending on the value of variable, err, message is displayed to the user appropriately.
