Question

Write a Java program to create a two-dimensional array, myFifthMatrix, with
the following specifications:
 Initialize myFifthMatrix with int type and with size [3][3].
 Use a for loop to fill the myFifthMatrix with random values between 0 and 99.
 Print the myFifthMatrix using a for loop.
 For each column, use a variable named total to store its sum. Add each element
in the column to total using a for loop

Answer 1

Program:

import java.util.*;

class MatrixColumnTotal
{
public static void main(String args[])
{
int r,c;
int myFifthMatrix[][]=new int[3][3];

for(r=0;r<=2;r++)
{
for(c=0;c<=2;c++)
{
myFifthMatrix[r][c]=(int)(Math.random()*(99-0)+0); //(int)(Math.random()*(upper-lower)+lower)
}
}

System.out.println("\nValues of myFifthMatrix[3][3] array: \n");

for(r=0;r<=2;r++)
{
for(c=0;c<=2;c++)
{
System.out.print(myFifthMatrix[r][c]+" ");
}
System.out.print("\n");
}

System.out.println("\n");
int total;
String s1="";
for(r=0;r<=2;r++)
{
total=0;
for(c=0;c<=2;c++)
{
total=total+myFifthMatrix[c][r];
}
System.out.println("Sum of the Column"+(r+1)+": "+total);
s1=s1+total+" "; //a space
}

System.out.println("\n");

for(r=0;r<=2;r++)
{
for(c=0;c<=2;c++)
{
System.out.print(myFifthMatrix[r][c]+" "); //two spaces
}
System.out.print("\n");
}
System.out.println("----------------------------");
System.out.println(s1);
System.out.println("----------------------------\n");
}
}

Output: