9 // printAnswer) to print the equation on the 'screen 10 function promptUser() { 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 let x = Number (prompt("Enter first number:")); let operator = prompt("Enter operator (+, -, *, or /):"); let y = Number (prompt("Enter second number:")); let answer = calc (x, operator, y); printAnswer(x, operator, y, answer); } // This function takes the two numbers and an operator as input. // It returns the answer for the equation. // If the operator is not +, -, *, or /, then it returns NaN. function calc(x, operator, y) { if (operator === "+") { return x + y } if (operator=== "-") { return x - y } if (operator ==="*") { return x * y } if (operator==="/") { return y !== 0 ? x/y: NaN; return NaN; } // This function prints the equation to the "screen" ("calculatorDisplay") // in tags, but does not overwrite what was previously there. // If the answer is NaN is should use the class "bad Input" to make the // text red. This is the only function that should call document.getElementById(). function printAnswer(x, operator, y, answer) { let display = document.getElementById("calculatorDisplay"); let paragraph = document.getElementById("p"); if (isNaN (answer)){ C paragraph.className ="badinput";
9 // printAnswer) to print the equation on the 'screen 10 function promptUser() { 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 let x = Number (prompt("Enter first number:")); let operator = prompt("Enter operator (+, -, *, or /):"); let y = Number (prompt("Enter second number:")); let answer = calc (x, operator, y); printAnswer(x, operator, y, answer); } // This function takes the two numbers and an operator as input. // It returns the answer for the equation. // If the operator is not +, -, *, or /, then it returns NaN. function calc(x, operator, y) { if (operator === "+") { return x + y } if (operator=== "-") { return x - y } if (operator ==="*") { return x * y } if (operator==="/") { return y !== 0 ? x/y: NaN; return NaN; } // This function prints the equation to the "screen" ("calculatorDisplay") // in tags, but does not overwrite what was previously there. // If the answer is NaN is should use the class "bad Input" to make the // text red. This is the only function that should call document.getElementById(). function printAnswer(x, operator, y, answer) { let display = document.getElementById("calculatorDisplay"); let paragraph = document.getElementById("p"); if (isNaN (answer)){ C paragraph.className ="badinput";
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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