Question

Write a Java program that calculates the sum of a variable sized matrix using a two dimensional array. (ArraySum.java) The user should provide the number of rows and columns Test multiple user inputs (3 times 2, 4 times 4, 6 times 2, etc) A sum should be created for each row, each column, and the total for the matrix Ex.: How big would you like your matrix? Rows - ? 3 Columns -? 2 Please enter your row 1? Column 1 - 3 Column 2 - 4 Please enter your row 2? Column 1 - 7 Column 2 - 40 Please enter your row 3? Column 1 - 20 Column 2 - 12 Your total for row 1 is -7 Your total for row 2 is - 47 Your total for row 3 is -32 Your total for column 1 is - 30 Your total for column 2 is -56 Your total for the 3 times 2 matrix is 86

Answer 1

/*java program that calculate the sum of a variable sized matrix using a two dimensional array*/

import java.util.Scanner;
class ArraySum
{
public static void main(String args[])
{
Scanner s=new Scanner(System.in);
int rows,columns,i=0,j=0;
int sum1=0,sum2=0;
int a[][]=new int[10][10];
System.out.println("How big would you like your matrix?");
System.out.println("Rows");
rows=s.nextInt(); /* reading row value*/
System.out.println("Columns");
columns=s.nextInt(); /* reading column value*/

for(i=0;i<rows;i++) /* reading values into matrix*/
{
System.out.println("\n please enter your row "+(i+1));
for(j=0;j<columns;j++)
{
System.out.println(" Column "+(j+1));   
a[i][j]=s.nextInt();
}
}
System.out.println();

System.out.println("the matrix entered is");
for(i=0;i<rows;i++) /* displaying the matrix*/
{
System.out.println();
for(j=0;j<columns;j++)
{
System.out.print("\t");
System.out.print(a[i][j]);
}
}
System.out.println(); /* to give one line of space*/
System.out.println();
for(i=0;i<rows;i++) /* calculating sum of each row */
{
sum1=0;
for(j=0;j<columns;j++)
{
sum1=sum1+a[i][j];
}
System.out.println("your total for row "+(i+1)+" is "+sum1);
  
}
System.out.println();

for(i=0;i<columns;i++) /* calculating sum of each column */
{
sum2=0;
for(j=0;j<rows;j++)
{
sum2=sum2+a[j][i];
}
System.out.println("your total for columns "+(i+1)+" is "+sum2);
  
}
System.out.println();
int sum=0;

for(i=0;i<rows;i++) /* calculating total of all elements in the matrix*/
for(j=0;j<columns;j++)
sum=sum+a[i][j];
System.out.println("your total for given matrix is"+sum);
}
}

Output 1:

  

Output 2:

Output 3: