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Contact [7]
3 years ago
7

Write a method called classSplit that accepts a file scanner as input. The data in the file represents a series of names and gra

duation years. You can assume that the graduation years are from 2021 to 2024.Sample input file:Hannah 2021 Cara 2022 Sarah2022Nate 2023 Bob 2022 Josef 2021 Emma 2022Your method should count the number of names per graduation year and print out a report like this --- watch the rounding!:students in class of 2021: 28.57%students in class of 2022: 57.14%students in class of 2023: 14.29%students in class of 2024: 00.00%You must match the output exactly.You may not use any arrays, arrayLists, or other datastructures in solving this problem. You may not use contains(), startsWith(), endsWith(), split() or related functions. Token-based processing, please.There is no return value.
Computers and Technology
1 answer:
Lelu [443]3 years ago
4 0

Answer:

public static void classSplit(Scanner file){

   int studentsOf21 = 0, studentsOf22 = 0,studentsOf23 = 0, studentsOf24 = 0;

   while (file.hasNext() == true){

       String studentName = file.next();

       int year = file.nextInt();

       switch (year){

           case 2021:

               studentsOf21++;

               break;

           case 2022:

               studentsOf22++;

               break;

           case 2023:

               studentsOf23++;

               break;

           case 2024:

               studentsOf24++;

               break;

       }

   }

   int totalGraduate = studentsOf21+studentsOf22+studentsOf23+studentsOf24;

   System.out.printf("students in class of 2021: %.2f%n", students2021*100.0/totalGraduate);

   System.out.printf("students in class of 2022: %.2f%n", students2022*100.0/totalGraduate);

   System.out.printf("students in class of 2023: %.2f%n", students2023*100.0/totalGraduate);  

   System.out.printf("students in class of 2024: %.2f%n", students2024*100.0/totalGraduate);

}

Explanation:

The classSplit method of the java class accepts a scanner object, split the object by iterating over it to get the text (for names of students) and integer numbers (for graduation year). It does not need a return statement to ask it prints out the percentage of graduates from 2021 to 2024.

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Answer:

Following are the code to this question:

public class ArrayMath//defining a class ArrayMath

{

public static void main(String[] args) //defining main method

{

int x[][]=new int[10][10]; //defining a 2D array  

arrays(x);//calling a method arrays by passing an array

}

private static void arrays(int[][] x)//defining a method arrays

{

int odd_column_sum=0,sum_of_Elements=0,i,j,even=1;//defining integer variable  

for(i=0;i<x.length;i++)//defining loop for columns  

{

for(j=0;j<x[0].length;j++)//defining loop for rows

{

x[i][j]=i*j;//multiply the i and j value atore in array

}

}

System.out.println("::The 2D array :: ");//print message

for(i=0;i<x.length;i++)//defining loop for columns

{

System.out.print("\t");//use print method for line space and line break  

for(j=0;j<x[0].length;j++)//defining loop for rows

{

System.out.printf("%d\t",x[i][j]); //print array values

}

System.out.println( );//print for line break

}

for(i=0;i<x.length;i++) //defining loop for Columns

{

for(j=0;j<x[0].length;j++) //defining loop for rows

{

if(even%2!=0)//defining if block for check odd number condition

{

odd_column_sum+=x[j][i];//add odd number of array

}

sum_of_Elements+=x[i][j];//add even number of array

}

even++;//increment even variable value by 1

}

System.out.println("The sum of Odd Columns:"+odd_column_sum);//print odd_column_sum value

System.out.println("The array elements :"+sum_of_Elements);//print sum_of_Elements value

}

}

Output:

please find attached file.

Explanation:

In the above-given code, a class "ArrayMath" is defined, inside the class the main method is declared, which define a 2D array "x", this stores 10 columns and 10 rows and at the last, we call the arrays method by passing an array as a variable.

In the arrays method, integer variable, "odd_column_sum, sum_of_Elements, i, j, and even" is defined, in which variable "i and j" is used in the loop for calculating value, even is used to check odd column and then store its value in the "odd_column_sum" variable, and add whole element value is added into the "sum_of_Elements" variable.

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