Question

You will create a program with 3 methods. For the previous homework with three problems, you will create a method for each problem.

In the main method, you will declare the three arrays and create the memory space for each of them. The first method will receive a one dimension array and then it will assign the values ( e.g., a[4] = 4*4*4*4;). The second method receives a 2 dimensional array and creates the calendar. The third method receives a two dimensional array and inverts row 1 in row.

Please note that you already have the bodies of the methods. You are only creating the methods and calling them in the main method.

You will also create methods printOneDimArray; printArrayCalendar; and printTwoDimArray to print each of the arrays.

Previous Homework Instructions

1. Assigning values to an array. Write a pseudo and the java code that for the first 10 numbers, the calculated number is equal to that number multiplied by itself that number of times. The result is saved in an array in the number cell. Also, you shall print all the values of the array.
   Constraints: you must use a loop instruction to assign values to the array.

arrayNum [0] = 0
arrayNum [1] = 1
arrayNum [2] = 2*2
arrayNum [3] = 3*3*3
arrayNum [4] = 4*4*4*4
…
arrayNum [10] = 10*10*10…..*10

Hints: a) arrayNum [2] has a value of 4 and arrayNum [3] has a value of 27; b) use one loop to traverse the array and another to calculate the value based on the current index.

2. Assigning values to a multidimensional array. Write a pseudocode and java code that puts the days of the month organized by weeks (as a calendar). Use a matrix of 5 x 7 (weeks of 7 days). Day 1 starts at [0][0]. See image in class ppt for arrays.

Hint: a) use one loop to manage the weeks and another to manage the days of the weeks

3. Manipulating arrays. Given a two dimensional array, invert the first row into the second row.   Print the array once you have inverted the first row. Initialize your array as follows:
   int [ ] [ ] myBiDimArrayNum = {
                                                            { 1, 3, 5 ,7},
                                                            { 0, 0, 0, 0 }
                                                         };
   Note: you algorithm should modify the array as follow:
   myBiDimArrayNum   
      row 1: 1, 3, 5 ,7
      row 2: 7, 5, 3, 1

previous homework attached below

1) public class Test{

public static void main(String []args){
int[] arrayNum=new int[11];
for(int i=0;i<=10;i++)
{
arrayNum[i]=i;
for(int j=0;j<i-1;j++)
{
arrayNum[i]=arrayNum[i]*i;
}
}
System.out.println("Array is");
for(int i=0;i<=10;i++)
{
System.out.println("arrayNum["+i+"]="+arrayNum[i]);
}

}
}

2) import java.util.Scanner;
import java.util.Arrays;
  
public class MyClass
{

public static void main(String args[])
{
int [ ] [ ] matrix = new int [5][7];

Scanner sc = new Scanner(System.in);
int days=1;
System.out.println("Assigning Values");

for (int i = 0; i <5; i++)
{
for (int j = 0; j < 7; j++)
{
matrix[i][j] = days++;
if(days==32)
{
break;
}

}
//because day can be 31 only.
if(days==31)
{
break;
}
}

  
for (int i = 0; i < 5; i++)
{
// Loop through all elements of current row
for (int j = 0; j < 7; j++)
{
System.out.print(matrix[i][j] + " ");
}
System.out.println();
}
  
}
}

3)

import java.util.Scanner;
import java.util.Arrays;
  
public class MyClass
{

public static void main(String args[])
{
int [ ] [ ] myBiDimArrayNum = {
{ 1, 3, 5 ,7},
{ 0, 0, 0, 0 }
};

Scanner sc = new Scanner(System.in);
int days=1;
System.out.println("Manipulating Array");

for (int i = 0; i <2; i++)
{
//take this variable to copy elements from end of row first.
int last=3;
for (int j = 0; j < 4; j++)
{
//because indexing start from zero 1 will represent row second now we have to change its content.
if(i==1)
{
//As we have to manipulate the second from ending of row first we are using ***(i-1) and assign it to second row that is **(i).
myBiDimArrayNum[i][j]=myBiDimArrayNum[i-1][last];
last--;
}

}
}

  
for (int i = 0; i < 2; i++)
{
// Loop through all elements of current row
for (int j = 0; j < 4; j++)
{
System.out.print(myBiDimArrayNum[i][j] + " ");
}
System.out.println();
}
  
}
}

Answer 1

This is modified java code.

import java.util.Scanner;
import java.util.Arrays;
class one{

void one1(int arr1[]){

for(int i=0;i<=10;i++)
{

arr1[i]=i;

for(int j=0;j<i-1;j++)
{

arr1[i]=arr1[i]*i;

}
}
System.out.println("Array is");
for(int i=0;i<=10;i++)
{

System.out.println("arrayNum["+i+"]="+arr1[i]);
}

}
}

class two{

void two1(int matrix[][])
{

int days=1;
System.out.println("Assigning Values");

for (int i = 0; i <5; i++)
{
for (int j = 0; j < 7; j++)
{
matrix[i][j] = days++;
if(days==32)
{
break;
}

}
//because day can be 31 only.
if(days==31)
{
break;
}
}


for (int i = 0; i < 5; i++)
{
// Loop through all elements of current row
for (int j = 0; j < 7; j++)
{
System.out.print(matrix[i][j] + " ");
}
System.out.println();
}

}
}

class three{
void three1(int myBiDimArrayNum[][])
{

int days=1;
System.out.println("Manipulating Array");

for (int i = 0; i <2; i++)
{
//take this variable to copy elements from end of row first.
int last=3;
for (int j = 0; j < 4; j++)
{
//because indexing start from zero 1 will represent row second now we have to change its content.
if(i==1)
{
//As we have to manipulate the second from ending of row first we are using ***(i-1) and assign it to second row that is **(i).
myBiDimArrayNum[i][j]=myBiDimArrayNum[i-1][last];
last--;
}

}
}


for (int i = 0; i < 2; i++)
{
// Loop through all elements of current row
for (int j = 0; j < 4; j++)
{
System.out.print(myBiDimArrayNum[i][j] + " ");
}
System.out.println();
}

}
}

public class Main
{

Scanner sc = new Scanner(System.in);
public static void main(String[] args) {

int[] arr1=new int[11];

int [ ] [ ] matrix = new int [5][7];
int [ ] [ ] myBiDimArrayNum = {
{ 1, 3, 5 ,7},
{ 0, 0, 0, 0 }
};

one obj1=new one();
two obj2=new two();
three obj3=new three();
System.out.println("method one\n\n");
obj1.one1(arr1);
System.out.println("method two\n\n");
obj2.two1(matrix);
System.out.println("method three\n\n");
obj3.three1(myBiDimArrayNum);
}
}

Output