Question

Write the definition of the function inputArray that prompts the user to input 20 numbers and stores the numbers into alpha. Write the definition of the function double Array that initializes the elements of beta to two times the corresponding elements in alpha. Make sure that you prevent the function from modifying the elements of alpha. Write the definition of the function copy AlphaBeta that stores alpha into the first five rows of matrix and beta into the last five rows of matrix. Make sure that you prevent the function from modifying the elements of alpha and beta. Write the definition of the function printArray that prints any one-dimensional array of type int. Print 15 elements per line.

Answer 1

Answer:

In Java:

public static  int[] inputArray(){

   Scanner input = new Scanner(System.in);

   int[] alpha = new int[20];

   for(int i = 0;i<20;i++){

       alpha[i] = input.nextInt();

   }

   return alpha;}

public static  int[] doubleArray(int [] alpha){

   int[] beta = new int[20];

   for(int i = 0;i<20;i++){

       beta[i] = 2 * alpha[i];

   }

   return beta;

}

public static int[] copyAlphaBeta(int [] alpha, int [] beta){

   int [] AlphaBeta = new  int[10];

   for(int i = 0;i<5;i++){

       AlphaBeta[i] = alpha[i];

   }

   int count = 5;

   for(int i = 15;i<20;i++){

       AlphaBeta[count] = beta[i];

       count++;

   }

   return AlphaBeta;

}

public static void printArray(int [] alpha){

   for(int i = 0;i<20;i++){

       System.out.print(alpha[i]+" ");

       if((i+1)%15 == 0){

           System.out.println(" ");

       }

   }

}

Explanation:

The inputArray is defined here

public static  int[] inputArray(){

   Scanner input = new Scanner(System.in);

This declares alpha array of 20 elements

   int[] alpha = new int[20];

The following iteration gets input from the user into the array

   for(int i = 0;i<20;i++){

       alpha[i] = input.nextInt();

   }

This returns the alpha array

   return alpha;}

The doubleArray is defined here. It takes the alpha array as its input parameter

public static  int[] doubleArray(int [] alpha){

This declares beta of 20 integers

   int[] beta = new int[20];

This populates beta by 2 * alpha[i]

   for(int i = 0;i<20;i++){

       beta[i] = 2 * alpha[i];

   }

This returns the alpha array

   return beta;}

The copyAlphaBeta array is defines here

public static int[] copyAlphaBeta(int [] alpha, int [] beta){

This declares AlphaBeta as 10 elements

   int [] AlphaBeta = new  int[10];

This populates the first 5 elements of AlphaBeta with the first 5 of alpha

   for(int i = 0;i<5;i++){

       AlphaBeta[i] = alpha[i];

   }

   int count = 5;

This populates the last 5 elements of AlphaBeta with the last 5 of beta

   for(int i = 15;i<20;i++){

       AlphaBeta[count] = beta[i];

       count++;

   }

This returns the AlphaBeta array

   return AlphaBeta;

}

The printArray is defined here. It takes the alpha array as its input parameter

public static void printArray(int [] alpha){

This iterates through alpha array

   for(int i = 0;i<20;i++){

This prints each element of the array

       System.out.print(alpha[i]+" ");

A new line is started after the 15th element

       if((i+1)%15 == 0){

           System.out.println(" ");

       }

   }

}

See attachment for complete program which includes the main

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