Created
May 1, 2021 14:06
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| // const readlineSync = require('readline-sync') | |
| import { question } from 'readline-sync'; | |
| type Operator = '+' | '-' | '*' | '/'; | |
| const fNum: string = question('Enter first number: '); | |
| const operator: string = question('Enter operator: '); // + , - , * , / | |
| const sNum: string = question('Enter second number: '); | |
| // console.log(fNum, operator, sNum); | |
| let isInputValid : boolean = isNumber(fNum) && isOperator(operator) && isNumber(sNum); | |
| let firstNumber = parseInt(fNum); | |
| let secondNumber = parseInt(sNum); | |
| if(isInputValid) { | |
| const result: number = calculate(firstNumber, operator as Operator, secondNumber); | |
| console.log(result); | |
| } else { | |
| console.log('Invalid input'); | |
| } | |
| function calculate(num1 : number, op: Operator, num2: number) : number { | |
| switch(op) { | |
| case '+': | |
| return num1+num2; | |
| case '-': | |
| return num1-num2; | |
| case '*': | |
| return num1*num2; | |
| case '/': | |
| return num1/num2; | |
| } | |
| } | |
| // console.log(isOperator(operator)); | |
| function isNumber (value: string) : boolean { | |
| let num = parseInt(value, 10); | |
| let notNumber = isNaN(num); | |
| return !notNumber; | |
| } | |
| function isOperator (value: string): boolean { | |
| switch(value) { | |
| case '+': | |
| case '-': | |
| case '*': | |
| case '/': | |
| return true; | |
| default: | |
| return false; | |
| } | |
| } |
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