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adding elements in a specified column or row in a two dimensional array java
By 
Frightened Frog
on Apr 30, 2020
Frightened Frog
on Apr 30, 2020
package multidimensionalarrays;
public class MultidimensionalArrays {
public static void main(String[] args) {
double sumOfRow = 0;
double[][] matrix = new double[3][4];
java.util.Scanner input = new java.util.Scanner(System.in); //Scanner
System.out.println("Enter a 3 by 4 matrix row by row: ");
//Prompt user to enter matrix numbers
for (int row = 0; row < matrix.length; row++) {
for (int col = 0; col < matrix[0].length; col++) {
matrix[row][col] = input.nextDouble();
}
}
double[] sumOfCol =new double[matrix[0].length];
for (int i = 0; i < matrix.length; i++) { //row
for (int j = 0; j < matrix[i].length; j++) { //column
sumOfRow += matrix[i][j];
sumOfCol[j] += matrix[i][j];
}
System.out.println("Sum of the elements at row " + row + " is: " + sumOfRow);
}
System.out.println("Sum of the elements at column " + col + " is: " + sumOfCol);
}
} Source: stackoverflow.com
1
adding elements in a specified column or row in a two dimensional array java
By Frightened Frog
on Apr 30, 2020
Frightened Frog
on Apr 30, 2020
/* After the prompt code segment and sumOfCol in the main method */
// Row (major index)
for (int row = 0; row < matrix.length; row++) {
int rowSum = 0;
for (int col = 0; col < matrix[row].length; col++) {
rowSum += matrix[row][col];
}
System.out.println("Sum of the elements at row " + row + " is: " + rowSum);
}
// Column (minor index)
// Assuming the length of each row is the same
for (int col = 0; col < matrix[0].length; col++) {
int colSum = 0;
for (int row = 0; row < matrix.length; row++) {
colSum += matrix[row][col];
}
System.out.println("Sum of the elements at col " + col + " is: " + colSum);
}Source: stackoverflow.com
1
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