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Created
August 21, 2019 00:09
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Javascript_get-two-numbers-and-do-some-basic-math
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <title>Practice JavaScript Math</title> | |
| <link href="css/styles.css" rel="stylesheet"> | |
| </head> | |
| <body> | |
| <script src="js/math.js"></script> | |
| </body> | |
| </html> |
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| // declare program variables | |
| // announce the program | |
| alert("Let's do some math!"); | |
| // collect numeric input | |
| var num1 = prompt("Please type a number"); | |
| num1 = parseFloat(num1); | |
| var num2 = prompt("Please type another number"); | |
| num2 = parseFloat(num2); | |
| if (isNaN(num2) || isNaN(num2)) { | |
| alert("one of both of your entries werent numbers. we will refresh and you should try again"); | |
| document.location.reload() | |
| } | |
| if (num2===0) { | |
| num2 = prompt("it cant be zero. enter somethin else"); | |
| console.log(num2) | |
| num2 = parseFloat(num2); | |
| if (num2===0) { | |
| console.log("is it getting here?") | |
| alert("for real dude, if you divide by zero, you explode. just start over.") | |
| document.location.reload() | |
| } | |
| } | |
| // build an HTML message | |
| var message = "<h1>Math with the numbers " + num1 + " and " + num2 + "</h1>"; | |
| message += num1 + " + " + num2 + " = " + (num1 + num2); | |
| message += "<br>"; | |
| message += num1 + " * " + num2 + " = " + (num1 * num2); | |
| message += "<br>"; | |
| message += num1 + " / " + num2 + " = " + (num1 / num2); | |
| message += "<br>"; | |
| message += num1 + " - " + num2 + " = " + (num1 - num2); | |
| // write message to web page | |
| document.write(message); | |
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