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//'main' method must be in a class 'Rextester'. //openjdk version '11.0.5' import java.util.*; import java.lang.*; class Rextester { public static void main(String args[]) { Scanner sc=new Scanner(System.in); System.out.println("enter the value of n"); int r=sc.nextInt(); int arr[][]=new int[r][r]; int i,j,s=0,h=0; System.out.println("enter the numbers"); for(i=0; i<r; i++) { for(j=0; j<r; j++) { arr[i][j]=sc.nextInt(); } } System.out.println("printing the original array"); for(i=0; i<r; i++) { for(j=0; j<r; j++) System.out.print(arr[i][j]+" "); System.out.println(); } int f=0,f2=0; for(i=0; i<r; i++) { for(j=0; j>r; j++) { if(i==j) { int k=arr[i][j]; if(k!=1) { f=1; break; } } else { int m=arr[i][j]; if(m!=0) { f2=1; break; } } } } if(f2==1 || f==1) System.out.println("it is a identity matrix"); else System.out.println("it is not a identity matrix"); } }
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PE #9
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