Question

This is a Entry to Java question. Please show me the PseudoCode or Commits first so I can learn to analyze everything a a little bit better.

Simple Calculator (10 points) (General) Calculators represent the most basic, general-purpose of computing machines. Your task is to reduce your highly capable computer down into a simple calculator. You will have to parse a given mathematical expression, and display its result. Your calculator must support addition (+), subtraction (-), multiplication (*), division (/), modulus(%), and exponentiation (**).

Facts

● Mathematical expressions in the form of: num1 operator num2

● Exponentiation should be in the form base ** exponent ○ Example: 3 ** 2 = 9

Input First line is the number of test cases. Each line thereafter is an integer-based mathematical expression in the form defined in the above facts.

Output For each test case, display the result of the mathematical expression terminated with a new line character

Sample Input

4

3+7

5-1

4**2

19/5

Sample Output

10

4

16

3

The main techniques that should be used are selection statements and repetition statements.

Answer 1

PseudoCode

start 1. ask user for number of inputs 2. accept user input 3. initialize loop variable to 0 3.1 if loop variable less than (input count - 1) then execute till 3.9 else goto 4 3.2 accept user input 3.3 if user input contains % then 3.3.1 split input by the character % 3.3.2 compute modulus of the two operands 3.3.3 save the result in an array 3.4 if user input contains ** then 3.4.1 split input by the character ** 3.4.2 compute op1^op2 (op1 raised to the power of op2) 3.4.3 save the result in an array 3.5 if user input contains + then 3.5.1 split input by the character + 3.5.2 compute sum of the two operands 3.5.3 save the result in an array 3.6 if user input contains - then 3.6.1 split input by the character - 3.6.2 subtract second operand from the first operand 3.6.3 save the result in an array 3.7 if user input contains * then 3.7.1 split input by the character * 3.7.2 compute product of the two operands 3.7.3 save the result in an array 3.8 if user input contains / then 3.8.1 split input by the character / 3.8.2 compute op1 / op2 (division) 3.8.3 save the result in an array 3.9 increase loop variable by 1 4. initialize a loop variable to 0 4.1 if loop variable (k) less than (input count - 1) then execute till 4.3 else goto end 4.2 print array[k] 4.3. increment loop variable k by 1 end

Java code

import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; public class Calculator { public static void main(String[] args) throws IOException { Calculator calculator = new Calculator(); InputStream in; try(BufferedReader br = new BufferedReader(new InputStreamReader(System.in))){ String inputCountStr = br.readLine(); int inputCount = Integer.parseInt(inputCountStr); String line; String[] operands; long[] output = new long[inputCount]; for(int i = 0; i < inputCount; i++){ line = br.readLine(); if(line.contains("%")){ operands = line.split("%"); output[i] = calculator.mod(Integer.parseInt(operands[0]), Integer.parseInt(operands[1])); } else if(line.contains("**")){ operands = line.split("\\*\\*"); output[i] = calculator.pow(Integer.parseInt(operands[0]), Integer.parseInt(operands[1])); } else if(line.contains("+")){ operands = line.split("\\+"); output[i] = calculator.add(Integer.parseInt(operands[0]), Integer.parseInt(operands[1])); } else if(line.contains("-")){ operands = line.split("-"); output[i] = calculator.subtract(Integer.parseInt(operands[0]), Integer.parseInt(operands[1])); } else if(line.contains("*")){ operands = line.split("\\*"); output[i] = calculator.multiply(Integer.parseInt(operands[0]), Integer.parseInt(operands[1])); } else if(line.contains("/")){ operands = line.split("/"); output[i] = calculator.divide(Integer.parseInt(operands[0]), Integer.parseInt(operands[1])); } } for(int k = 0; k < inputCount; k++){ System.out.println(output[k]); } } } public long add(int a, int b){ return a + b; } public int subtract(int a, int b){ return a - b; } public long multiply(int a, int b){ return a * b; } public int divide(int a, int b){ return a / b; } public int mod(int a, int b){ return a % b; } public long pow(int a, int b){ return (long)Math.pow(a, b); } }

Sample input/output:

6
7+6
5-4
3*6
9/3
8%3
2**3
13
1
18
3
2
8

Summery: the program first asks (however, no message in prompt - as per question) for the number of inputs (calculations) the user intends to enter. then the program takes the inputs - one input per line; and once all the inputs are taken, all the results are printed in the console in the order of the given inputs. the program ends there.

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