Question

7.9.1: Find 2D array max and min.

Find the maximum value and minimum value in milesTracker. Assign the maximum value to maxMiles, and the minimum value to minMiles. Sample output for the given program:

Min miles: -10
Max miles: 40

import java.util.Scanner;

public class ArraysKeyValue {
public static void main (String [] args) {
Scanner scnr = new Scanner(System.in);
final int NUM_ROWS = 2;
final int NUM_COLS = 2;
int [][] milesTracker = new int[NUM_ROWS][NUM_COLS];
int i;
int j;
int maxMiles; // Assign with first element in milesTracker before loop
int minMiles; // Assign with first element in milesTracker before loop

for (i = 0; i < milesTracker.length; i++){
for (j = 0; j < milesTracker[i].length; j++){
milesTracker[i][j] = scnr.nextInt();
}
}

/* Your solution goes here */

System.out.println("Min miles: " + minMiles);
System.out.println("Max miles: " + maxMiles);
}
}

Answer 1

import java.util.Scanner;

public class ArraysKeyValue {
  public static void main (String [] args) {
    Scanner scnr = new Scanner(System.in);

    final int NUM_ROWS = 2;
    final int NUM_COLS = 2;
    int [][] milesTracker = new int[NUM_ROWS][NUM_COLS];
    int i;
    int j;
    int maxMiles; // Assign with first element in milesTracker before loop
    int minMiles; // Assign with first element in milesTracker before loop

    for (i = 0; i < milesTracker.length; i++){
      for (j = 0; j < milesTracker[i].length; j++){
        milesTracker[i][j] = scnr.nextInt();
      }
    }

    maxMiles = milesTracker[0][0];
    minMiles = milesTracker[0][0];

    for(i = 0;i<NUM_ROWS;i++){
      for(j = 0;j<NUM_COLS;j++){
        if(minMiles > milesTracker[i][j]){
          minMiles = milesTracker[i][j];
        }
        if(maxMiles < milesTracker[i][j]){
          maxMiles = milesTracker[i][j];
        }
      }
    }

    System.out.println("Min miles: " + minMiles);
    System.out.println("Max miles: " + maxMiles);
  }
}