/**

* LABTEST 3 - EECS1710, F2017

*

*

* FIRST NAME: XXXXXXXXXXXXXXXXXXXXX

* LAST NAME: YYYYYYYYYYYYYYYYYYYYY

* LOGIN: ZZZZZZZZZ

*

* SID: SSSSSSSSS

*

*

*

*/

// QUESTIONS TO ANSWER + INSTRUCTIONS ARE IN MAIN METHOD BELOW

public class Question01 {

// This method will print out a 2D array (DO NOT MODIFY)

public static void printGrid(int[][] grid, int m, int n) {

// This method will print out the m x n array

// DO NOT CHANGE THIS METHOD

for (int i=0; i < m; i++) { // iterates over rows

for (int j=0; j < n; j++) { // iterates over columns

System.out.printf("%5d");

}

System.out.println();

}

}

// This method is for part 1b - you need to modify and complete it

public static int sumColumn(int[][] grid, int col) {

int sum = 0;

// COMPLETE THIS METHOD (for Part 1b)

return sum;

}

public static void main(String[] args) {

// *************************************************************************

// TASK 1a: [5 marks]

//

// Declare and initialize a 2D array of integers called "myGrid"

//

// The size of the array is given by the constants M and N (defined below)

//

// Initialize the array (at declaration or with a loop) such that each

// of the positions of the array are assigned unique integers starting

// from 1, and incrementing by 1 up to the value M*N.

//

// Here is an example of the expected output when printed using the printGrid

// method (provided for you):

//

// myGrid =

//

// 1 2 3 4 5

// 6 7 8 9 10

// 11 12 13 14 15

// 16 17 18 19 20

//

//

//

final int M = 4;

final int N = 5;

// CODE FOR 1(a) GOES HERE

System.out.println(" Part 1a: ");

System.out.println("myGrid = ");

// call to printGrid method (outputs myGrid)

// note printGrid should NOT be modified!

printGrid(myGrid, M, N);

// *************************************************************************

// TASK 1b: [5 marks total]

//

// Complete the method "sumColumn(int grid, int col)" at the top of this file,

// by writing a loop to find the sum of all the elements in a 2D array

// that are in the column specified by "col".

//

// e.g. if col=2, then only the numbers denoted by '*' (shown below)

// would be added in the sum

//

// myGrid =

//

// 1 2 * 4 5

// 6 7 * 9 10

// 11 12 * 14 15

// 16 17 * 19 20

//

//

// If you could not do 1(a), create another MxN array "myGrid" for this part

// with any values you wish

int col = 2;

// CODE FOR 1(b) GOES IN METHOD sumColumn defined at top of this file

// CODE GOES THERE, NOT HERE!!

int sumCol = sumColumn(myGrid, col);

System.out.println(" Part 1b: ");

System.out.println("The sum of elements in column " + col + "of myGrid = " + sumCol);

System.out.println();

// *************************************************************************

// TASK 1c: [5 marks total]

//

// Modify the elements in myGrid (using a loop), so that the following

// is printed to the screen by the printGrid() method

//

// DO NOT MODIFY THE printGrid() METHOD !!

// Only modify how you set the values for the myGrid array

//

// myGrid =

//

// 1 5 9 13 17

// 2 6 10 14 18

// 3 7 11 15 19

// 4 8 12 16 20

//

//

// CODE FOR 1(c) GOES HERE

System.out.println(" Part 1c: ");

System.out.println("myGrid = ");

printGrid(myGrid, M, N);

}

}