A manner to compute matrix trace, and display it with matrix data.

matrixComputing.java

import java.util.Scanner;

public class sdz {

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);
        int numberOfrows ;
        System.out.print("Enter the number of row and cols in the matrix : ");
        int trace = 0;
        numberOfrows = sc.nextInt();
        int[][] tab = new int[numberOfrows][numberOfrows];
        int tmp = 0;
        for(int i = 0; i < numberOfrows; i ++){
            for(int j =0; j < numberOfrows ; j++){
                System.out.print("Enter the element of row " + (i+1) + " col " + (j+1));
                tab[i][j] = sc.nextInt();
            }
            trace += tab[i][i];
        }
        System.out.println(trace);

        for(int i = 0; i < tab.length; i++){

            for(int j = 0; j< tab.length; j++){
                System.out.print(tab[i][j] + " ");
            }
            System.out.println();
        }
        int smallest = tab[0][0];
        for(int i = 0; i < tab.length; i++){

            for(int j = 0; j < tab.length; j++){
                if(tab[i][j] <= smallest){
                    smallest = tab[i][j];

                }else{
                    smallest = smallest;
                }


            }
            tmp = smallest;
        }
        System.out.println("The smallest element of the matrix is " + tmp);
    }
}