Math Pages
This program was written for our daughter and son. Our daughter is learning multiplication and division. Our son is learning addition and subtraction.
Main
import java.io.IOException;
import java.util.Scanner;
public class Main {
public static void main(String[] args) throws IOException {
while (true) {
System.out.println();
System.out.println();
System.out.println("0: Exit the program");
System.out.println();
System.out.println("1: 50 problems of first number times 0 to 12: ");
System.out.println("\t This does numbers only 0 to 12");
System.out.println("\t File name is 50_multi_output.txt");
System.out.println("\t You choose a number 0 to 12");
System.out.println("\t You choose 2");
System.out.println("\t ex 12 * 2 = ___ or 2 * 8 = ___");
System.out.println();
System.out.println("2: 50 random problems of ( 0 to M) times ( 0 to N ): ");
System.out.println("\t M is the row value of array ex 14");
System.out.println("\t N is the column value of array ex 16");
System.out.println("\t your example would be 0 to 14 x 0 x 16");
System.out.println("\t file name is 50_multi_MxN_output.txt");
System.out.println("\t" + "ex 8 * 6 = ___ or 4 * 9 = ___");
System.out.println();
System.out.println("3: 50 random problems of ( 0 to 12) plus ( 0 to 12 ): ");
System.out.println("\t file name is 50_add_12x12_output.txt");
System.out.println("\t ex 3 + 8 = ___ or 2 + 6 = ___");
System.out.println();
System.out.println("4: 50 problems of first number + 0 to 12");
System.out.println("\t This does numbers only 0 to 12");
System.out.println("\t File name is 50_add_output.txt");
System.out.println("\t You choose a number 0 to 12");
System.out.println("\t You choose 2");
System.out.println("\t ex 12 + 2 = ___ or 2 + 8 = ___");
System.out.println();
System.out.println("5: 50 problems of first number minus 0 to 12");
System.out.println("\t This does numbers only 0 to 12");
System.out.println("\t File name is 50_sub_output.txt");
System.out.println("\t You choose a number 0 to 12");
System.out.println("\t You choose 2");
System.out.println("\t ex 12 - 2 = ___ or 8 - 2 = ___");
System.out.println();
System.out.println("6: Tables");
System.out.println(" Create addition and multiplication tables 0 to 12");
System.out.println();
System.out.println("10: 50 problems of first number divided by 0 to 12: ");
System.out.println("\t This does numbers only 0 to 12");
System.out.println("\t File name is 50_div_output.txt");
System.out.println("\t You choose a number 0 to 12");
System.out.println("\t You choose 2");
System.out.println("\t ex 12 / 2 = ___ or 8 / 2 = ___");
System.out.println();
System.out.println("Pick case: ");
Scanner MyCaseObj = new Scanner(System.in);
int MyCase = MyCaseObj.nextInt();
System.out.println();
System.out.println();
switch (MyCase) {
case 1:
System.out.println("Operator is multiplication");
System.out.println("Pick your number to multiply to 0 to 12: ");
Scanner MyObj1 = new Scanner(System.in);
int num = MyObj1.nextInt();
if (0 <= num && num <= 12) {
MathFunction mathFunction = new MathFunction(1, num, "x");
}
break;
case 2:
System.out.println("Operator is multiplication");
System.out.println("Pick your first ending number? 9 gives you 0-8");
Scanner MyObj2_1 = new Scanner(System.in);
int c2_num1 = MyObj2_1.nextInt();
System.out.println("Pick your second ending number? 9 gives you 0-8");
Scanner MyObj2_2 = new Scanner(System.in);
int c2_num2 = MyObj2_2.nextInt();
MathFunction mathFunction1 = new MathFunction(2, c2_num1, c2_num2, "x");
break;
case 3:
// Operator is plus
// 50 random problems 0 to 12 + 0 to 12
// random number 0 to 12 uses 13, random is 0 to N-1
MathFunction mathFunction2 = new MathFunction(3, 13, 13, "+");
break;
case 4:
System.out.println("Operator is addition");
System.out.println("What number do you want to add to 0 to 12?");
// Is designed for numbers 0 to 12
Scanner MyObjAdd = new Scanner(System.in);
int numAdd = MyObjAdd.nextInt();
// Addition addition = new Addition(numAdd, "+");
MathFunction mathFunction3 = new MathFunction(4, numAdd, "+");
break;
case 5:
System.out.println("Operator is subtraction");
System.out.println("What number do you want to subtract with 0 to 12?");
// Is designed for numbers 0 to 12
MathFunction mathFunction4 = new MathFunction(5, 13,13, "-");
break;
case 6:
Tables.tables(14,16);
break;
case 10:
System.out.println("Operator is division");
System.out.println("");
Scanner MyObjDiv = new Scanner(System.in);
// Division sign is char 247.
char ch = 247;
String hex = String.format("%04x", (int) ch);
// System.out.println(hex);
int hexToInt = Integer.parseInt(hex, 16);
char intToChar = (char) hexToInt;
String div_sign = Character.toString(intToChar);
System.out.print("The first number (0 through 12: ");
int numDiv = MyObjDiv.nextInt();
if (1 <= numDiv && numDiv <= 12) {
MathFunction mathFunction5 = new MathFunction(10, numDiv, div_sign);
}
break;
case 0:
Scanner MyExit = new Scanner(System.in);
System.out.println("Exiting...");
MyExit.close();
return; // Exit the loop and program
default:
System.out.println("default");
}
}
}
}
MathFunction
import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Random;
public class MathFunction {
public int num;
public int num1;
public int num2;
public int MyCase;
public String operator;
// Write the file
// BufferedWriter writer = null;
// Case 1 does multiplication
// Case 4 does addition
public MathFunction(int MyCase, int num, String operator) throws IOException {
// arr_2d
// 1-A, 1-B, 2-A, 2-B, 3-A, 3-B, 4-A, 4-B, 5-A, 5-B across each row
// 2-A
// 3-A
int[][] arr_2d = new int[12][12];
this.num = num;
this.operator = operator;
this.MyCase = MyCase;
// arr_2d
// int[][] arr_2d = new int[10][10];
// 1-A, 1-B, 2-A, 2-B, 3-A, 3-B, 4-A, 4-B, 5-A, 5-B across each row
// 2-A
// 3-A
if (MyCase == 2 || MyCase == 3) {
System.out.println("MYCase Loop" + MyCase);
for (int row = 0; row < 10; row++) {
for (int column = 0; column < 10; column += 2) {
Random random = new Random();
arr_2d[row][column] = random.nextInt(13);
arr_2d[row][column + 1] = random.nextInt(13);
}
}
}
// You give a number for Case 1 and 4
if (MyCase == 1 || MyCase == 4) {
System.out.println("MYCase Loop" + MyCase);
for (int row = 0; row < 10; row++) {
for (int column = 0; column < 10; column += 2) {
Random random = new Random();
arr_2d[row][column] = num;
// random 0 to 12 uses 13.
arr_2d[row][column + 1] = random.nextInt(13);
int first = arr_2d[row][column];
int second = arr_2d[row][column + 1];
if (first < second) {
int lower = first;
int higher_num = second;
int lower_num = first;
arr_2d[row][column] = higher_num;
arr_2d[row][column + 1] = lower_num;
}
else if (first >= second) {
int higher_num = first;
int lower_num = second;
arr_2d[row][column] = higher_num;
arr_2d[row][column + 1] = lower_num;
} //else if (first >= second)
}
}
}
if (MyCase == 10) {
// arr_2d
// int[][] arr_2d = new int[10][10];
// 1-A, 1-B, 2-A, 2-B, 3-A, 3-B, 4-A, 4-B, 5-A, 5-B across each row
// 2-A
// 3-A
Random random = new Random();
for (int row = 0; row < 10; row += 1) {
for (int column = 0; column < 10; column += 2) {
int rnd_num1 = random.nextInt(12) ;
int product = rnd_num1 * num;
arr_2d[row][column] = product;
arr_2d[row][column + 1] = num;
}
}
}
print2D(MyCase, operator, arr_2d);
if (MyCase < 11) {
print2D_vert(MyCase, operator, arr_2d);
}
}
public MathFunction(int MyCase, int num1, int num2, String operator) throws IOException {
// MyCase 2 Operator is multiplication
// You pick your first number zero to number
// You pick you second number zero to number
this.num1 = num1;
this.num2 = num2;
this.operator = operator;
this.MyCase = MyCase;
int[][] arr_2d = new int[10][10];
for (int row = 0; row < 10; row++) {
for (int column = 0; column < 10; column += 2) {
Random random = new Random();
Random random2 = new Random();
int bound_1 = num1;
int bound_2 = num2;
if (MyCase == 2) {
arr_2d[row][column] = random.nextInt(bound_1);
arr_2d[row][column + 1] = random2.nextInt(bound_2);
} //if (MyCase == 2)
//MyCase 3 or MyCase 5
// put larger number first
if ( MyCase == 3 || MyCase == 5) {
int first = random.nextInt(13);
int second = random2.nextInt(13);
System.out.println("Before: " + first + " " + second);
if (first < second) {
int lower = first;
int higher_num = second;
int lower_num = first;
arr_2d[row][column] = higher_num;
arr_2d[row][column + 1] = lower_num;
}
else if (first >= second) {
int higher_num = first;
int lower_num = second;
arr_2d[row][column] = higher_num;
arr_2d[row][column + 1] = lower_num;
} //else if (first >= second)
} //if ( MyCase == 3 || MyCase == 5)
if (MyCase == 10) {
arr_2d[row][column] = random.nextInt(bound_1);
arr_2d[row][column + 1] = random.nextInt(bound_2);
} // if (MyCase == 10) {
} // for column
} // for row
print2D(MyCase, operator, arr_2d);
if (MyCase < 11) {
print2D_vert(MyCase, operator, arr_2d);
} // if (MyCase < 11)
}
public static void print2D(int MyCase, String operator, int[][] arr_2d) throws IOException {
String filePath = " ";
String user_name = System.getProperty("user.name");
if (MyCase == 1) {
filePath = "C:\\Users\\" + user_name + "\\Documents\\50_multi_output.txt";
} else if (MyCase == 2) {
filePath = "C:\\Users\\" + user_name + "\\Documents\\50_multi_MxN_output.txt";
} else if (MyCase == 3) {
filePath = "C:\\Users\\" + user_name + "\\Documents\\50_add_12x12_output.txt";
} else if (MyCase == 4) {
filePath = "C:\\Users\\" + user_name + "\\Documents\\50_add_output.txt";
} else if (MyCase == 5) {
filePath = "C:\\Users\\" + user_name + "\\Documents\\50_sub_12x12_output.txt";
} else if (MyCase == 10) {
filePath = "C:\\Users\\" + user_name + "\\Documents\\50_div_output.txt";
}
// Replace with your desired file path
// Loop through all rows
int linecount = 0;
String[] line = new String[20];
String[] line_vert = new String[20];
int counter = 0;
for (int row = 0; row < 10; row++) {
for (int column = 0; column < 10; column += 2) {
String f_num_1 = String.format("%d", arr_2d[row][column]);
String f_num_2 = String.format("%d", arr_2d[row][column + 1]);
int higher_num = Integer.parseInt(f_num_1);
int lower_num = Integer.parseInt(f_num_2);
Random rand = new Random();
double rand_01 = rand.nextDouble();
if (MyCase == 10) {
String str_line = (f_num_1 + " " + operator + " " + f_num_2 + " = " + "___ ");
int str_len = str_line.length();
if (str_len == 14) {
line[linecount] += (f_num_1 + " " + operator + " " + f_num_2 + " = " + "___ ");
line_vert[linecount] += (f_num_1 + " " + operator + " " + f_num_2 + " = " + "___ ");
}
if (str_len == 15) {
line[linecount] += (f_num_1 + " " + operator + " " + f_num_2 + " = " + "___ ");
line_vert[linecount] += (f_num_1 + " " + operator + " " + f_num_2 + " = " + "___ ");
}
if (str_len == 16) {
line[linecount] += (f_num_1 + " " + operator + " " + f_num_2 + " = " + "___ ");
line_vert[linecount] += (f_num_1 + " " + operator + " " + f_num_2 + " = " + "___ ");
}
}
else if (MyCase == 3 || MyCase == 5) {
String str_line = (f_num_1 + " " + operator + " " + f_num_2 + " = " + "___ ");
int str_len = str_line.length();
if (str_len == 14) {
line[linecount] += (f_num_1 + " " + operator + " " + f_num_2 + " = " + "___ ");
line_vert[linecount] += (f_num_1 + " " + operator + " " + f_num_2 + " = " + "___ ");
}
if (str_len == 15) {
line[linecount] += (f_num_1 + " " + operator + " " + f_num_2 + " = " + "___ ");
line_vert[linecount] += (f_num_1 + " " + operator + " " + f_num_2 + " = " + "___ ");
}
if (str_len == 16) {
line[linecount] += (f_num_1 + " " + operator + " " + f_num_2 + " = " + "___ ");
line_vert[linecount] += (f_num_1 + " " + operator + " " + f_num_2 + " = " + "___ ");
}
}
else if (rand_01 < .5) {
// adjust print width
if (f_num_1 != null) {
String str_line = (f_num_1 + " " + operator + " " + f_num_2 + " = " + "___ ");
int str_len = str_line.length();
if (str_len == 14) {
line[linecount] += (f_num_1 + " " + operator + " " + f_num_2 + " = " + "___ ");
line_vert[linecount] += (f_num_1 + " " + operator + " " + f_num_2 + " = " + "___ ");
}
if (str_len == 15) {
line[linecount] += (f_num_1 + " " + operator + " " + f_num_2 + " = " + "___ ");
line_vert[linecount] += (f_num_1 + " " + operator + " " + f_num_2 + " = " + "___ ");
}
if (str_len == 16) {
line[linecount] += (f_num_1 + " " + operator + " " + f_num_2 + " = " + "___ ");
line_vert[linecount] += (f_num_1 + " " + operator + " " + f_num_2 + " = " + "___ ");
}
} // if (f_num_1 != null)
}
else {
if (f_num_1 != null) {
String str_line = (f_num_2 + " " + operator + " " + f_num_1 + " = " + "___ ");
int str_len = str_line.length();
if (str_len == 14) {
line[linecount] += (f_num_2 + " " + operator + " " + f_num_1 + " = " + "___ ");
line_vert[linecount] += (f_num_2 + " " + operator + " " + f_num_1 + " = " + "___ ");
}
if (str_len == 15) {
line[linecount] += (f_num_2 + " " + operator + " " + f_num_1 + " = " + "___ ");
line_vert[linecount] += (f_num_2 + " " + operator + " " + f_num_1 + " = " + "___ ");
}
if (str_len == 16) {
line[linecount] += (f_num_2 + " " + operator + " " + f_num_1 + " = " + "___ ");
line_vert[linecount] += (f_num_2 + " " + operator + " " + f_num_1 + " = " + "___ ");
}
} // if (f_num_1 != null)
counter++;
} // else
} // for colmun
linecount++;
} // for row
BufferedWriter writer = null;
writer = new BufferedWriter(new FileWriter(filePath));
for (int x = 0; x < 10; x++) {
// System.out.println(line[x].replace("null", ""));
String print_line = line[x].replace("null", "");
writer.write(print_line);
writer.newLine();
writer.newLine();
}
writer.close();
}
public static void print2D_vert ( int MyCase, String operator,int[][] arr_2d) throws IOException {
// line_arr
// int[][] line_arr = new int[50][5];
// 1-A , 2-A, 3-A, 4-A, 5-A down column
// 1-B , 2-B, 3-B. 4-B, 5-B
// 2-A
// 2-B
//int[][] line_arr = new int[50][5];
String filePath = " ";
String user_name = System.getProperty("user.name");
if (MyCase == 1) {
filePath = "C:\\Users\\" + user_name + "\\Documents\\50_multi_output_vert.txt";
} else if (MyCase == 2) {
filePath = "C:\\Users\\" + user_name + "\\Documents\\50_multi_MxN_output_vert.txt";
} else if (MyCase == 3) {
filePath = "C:\\Users\\" + user_name + "\\Documents\\50_add_12x12_output_vert.txt";
} else if (MyCase == 4) {
filePath = "C:\\Users\\" + user_name + "\\Documents\\50_add_output_vert.txt";
} else if (MyCase == 5) {
filePath = "C:\\Users\\" + user_name + "\\Documents\\50_sub_12x12_output_vert.txt";
} else if (MyCase == 10) {
filePath = "C:\\Users\\" + user_name + "\\Documents\\50_div_output_vert.txt";
}
// vertical printing for add, subtract, mutliply
int linecount = 0;
String[] line_vert = new String[50];
System.out.println(MyCase);
if (MyCase < 11) {
for (int row = 0; row < 10; row++) {
for (int column = 0; column < 10; column += 2) {
String f_num_1 = String.format("%2d", arr_2d[row][column]);
String f_num_2 = String.format("%2d", arr_2d[row][column + 1]);
line_vert[linecount] += (" " + f_num_1 + " ");
line_vert[linecount + 1] += (operator + " " + f_num_2 + " ");
line_vert[linecount + 2] += ("-----" + " ");
line_vert[linecount + 3] += ("");
line_vert[linecount + 4] += ("");
}
linecount += 5;
}
}
BufferedWriter writer = null;
writer = new BufferedWriter(new FileWriter(filePath));
for (int row = 0; row < 50; row++) {
// System.out.println(line[x].replace("null", ""));
String print_line = line_vert[row].replace("null", "");
writer.write(print_line);
writer.newLine();
}
writer.close();
}
}
Tables
import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Scanner;
//
public class Tables {
public static void tables(int row_count, int column_count) throws IOException {
int[][] arr_2d = new int[row_count+1][column_count+1];
String user_name = System.getProperty("user.name");
System.out.println("1: Addition Table");
System.out.println("2: Multiplication Table");
Scanner MySymbol = new Scanner(System.in);
int MyCase = MySymbol.nextInt();
System.out.println();
switch (MyCase) {
case 1:
String filePath = "C:\\Users\\" + user_name + "\\Documents\\add_table_output.txt";
int row_number = arr_2d.length;
System.out.println(row_number);
int column_number = arr_2d[1].length;
System.out.println(column_number);
for (int row = 1; row < row_number; row++) {
arr_2d[row][0] = row;
for (int column = 1; column < column_number; column++) {
arr_2d[0][column] = column;
arr_2d[row][column] = row + column;
}
}
print2D(filePath, arr_2d);
break;
case 2:
filePath = "C:\\Users\\" + user_name + "\\Documents\\multi_table_output.txt";
row_number = arr_2d.length;
System.out.println(row_number);
column_number = arr_2d[1].length;
System.out.println(column_number);
for (int row = 1; row < row_number; row++) {
arr_2d[row][0] = row;
for (int column = 1; column < column_number; column++) {
arr_2d[0][column] = column;
arr_2d[row][column] = row * column;
}
}
print2D(filePath, arr_2d);
break;
} //Case
}
public static void print2D(String filePath, int[][] arr_2d) throws IOException {
System.out.println("Array Dim Row: " +arr_2d.length);
System.out.println("Array Dim Columns: " + arr_2d[1].length );
int row_number = arr_2d.length;
int line_number = row_number * 2;
int column_number = arr_2d[1].length;
int linecount = 0;
String[] line = new String[line_number];
for (int row = 0; row < row_number ; row++) {
for (int column = 0; column < column_number; column++) {
String f_num = String.format("%03d", arr_2d[row][column]);
line[linecount] += (f_num + " | " + " ");
line[linecount + 1] += ("----" + " ");
}
System.out.println();
linecount += 2;
}
System.out.println();
BufferedWriter writer = null;
writer = new BufferedWriter(new FileWriter(filePath));
for (int row = 0; row < line_number; row++) {
// System.out.println(line[x].replace("null", ""));
String print_line = line[row].replace("null", "");
writer.write(print_line);
writer.newLine();
}
writer.close();
}
}
Menu
0: Exit the program
1: 50 problems of first number times 0 to 12:
This does numbers only 0 to 12
File name is 50_multi_output.txt
You choose a number 0 to 12
You choose 2
ex 12 * 2 = ___ or 2 * 8 = ___
2: 50 random problems of ( 0 to M) times ( 0 to N ):
M is the row value of array ex 14
N is the column value of array ex 16
your example would be 0 to 14 x 0 x 16
file name is 50_multi_MxN_output.txt
ex 8 * 6 = ___ or 4 * 9 = ___
3: 50 random problems of ( 0 to 12) plus ( 0 to 12 ):
file name is 50_add_12x12_output.txt
ex 3 + 8 = ___ or 2 + 6 = ___
4: 50 problems of first number + 0 to 12
This does numbers only 0 to 12
File name is 50_add_output.txt
You choose a number 0 to 12
You choose 2
ex 12 + 2 = ___ or 2 + 8 = ___
5: 50 problems of first number minus 0 to 12
This does numbers only 0 to 12
File name is 50_sub_output.txt
You choose a number 0 to 12
You choose 2
ex 12 – 2 = ___ or 8 – 2 = ___
6: Tables
Create addition and multiplication tables 0 to 12
10: 50 problems of first number divided by 0 to 12:
This does numbers only 0 to 12
File name is 50_div_output.txt
You choose a number 0 to 12
You choose 2
ex 12 / 2 = ___ or 8 / 2 = ___
Pick case:
Menu item: 1
This item allows you to pick the number you will multiply by 0 to 12.
Pick case:
1
Operator is multiplication
Pick your number to multiply to 0 to 12:
4
Pick case:
2
Operator is multiplication
Pick your first ending number? 9 gives you 0-8
9
Pick your second ending number? 9 gives you 0-8
9
Pick case:
3
Pick case:
4
Operator is addition
What number do you want to add to 0 to 12?
4
Pick case:
5
Pick case:
6
1: Addition Table
2: Multiplication Table
