Topic: (Sum elements column by column) Write a program that reads an 3 by 4 matr
ID: 3680828 • Letter: T
Question
Topic: (Sum elements column by column)
Write a program that reads an 3 by 4 matrix and displays the sum of each column and each row separately.
Here is the sample run:
Enter a 3 by4 matrix row by row:
1.5 2 3 4
5.5 6 7 8
9.5 1 3 1
Sum of the elements at column 0 is 16.5
Sum of the elements at column 1 is 9.0
Sum of the elements at column 2 is 13.0
Sum of the elements at column 3 is 13.0
Sum of the elements at Row 0 is: 10.5
Sum of the elements at Row 0 is: 26.5
Sum of the elements at Row 0 is: 14.5
Bonus: Rewrite your program with a method that returns the sum of all the elements in a specified column in a matrix using the following header:
Public static double sumColumn (double[][] m, int columnIndex) {
}
Need Code in Java
Explanation / Answer
The Java Code:
class Smofele {
public static void main(String[] args) {
int [][] scores = {{ 20, 18, 23, 20, 16 },
{ 30, 20, 18, 21, 20 },
{ 16, 19, 16, 53, 24 },
{ 25, 24, 22, 24, 25 }};
outputArray(scores);
}
public static void outputArray(int[][] array) {
int sum= 0;
int rowSize = array.length;
int columnSize = array[0].length;
System.out.println("rows=" + rowSize + "cols=" + columnSize);
int[] colSum =new int[array[0].length];
for (int i = 0; i < array.length; i++){
for (int j = 0; j < array[i].length; j++){
sum += array[i][j];
colSum[j] += array[i][j];
}
System.out.println("Print the sum of rows =" + sum);
}
for(int k=0;k<colSum.length;k++){
System.out.println("Print the sum of columns =" + colSum[k]);
}