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May 9, 2015 20:36
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JavaScript code to Demonstrate my understanding of the "Math" object. I also write a simple FIBONACCI number generator.
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title>ERIC'S CODE - Not A Number</title> | |
| <style type="text/css"> | |
| .ans { | |
| color: green; | |
| font-weight: bold; | |
| background-color: yellow; | |
| border: sold black 1px; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <h1>Demonstration Program:<br /> | |
| Demonstrates several functions in the JavaScript "Math" object | |
| </h1> | |
| <hr /> | |
| <script type="text/javascript"> | |
| // CONSTANTS: | |
| var tab3 = " "; | |
| // writes val to browser and carriage returns | |
| function print(val) { | |
| document.write(val + "<br /><hr />"); | |
| } | |
| // Math.round | |
| function round(val) { | |
| return Math.round(val); | |
| } | |
| // Math.max | |
| function maxOf3(a,b,c) { | |
| var max = Math.max(a,b,c); | |
| return max; | |
| } | |
| // Math.min | |
| function minOf3(a,b,c) { | |
| var min = Math.min(a,b,c); | |
| return min; | |
| } | |
| // Math.PI | |
| function circleArea(num) { | |
| // PI * r * r | |
| var area = Math.PI * num * num; | |
| return area; | |
| } | |
| function circumference(num) { | |
| // 2 * PI * r | |
| var circ = Math.PI * num * 2; | |
| return circ; | |
| } | |
| // Math.random | |
| // Math.sqrt | |
| // Math.log | |
| // generates an array of fibonacci number to | |
| // "iterations" number of iterations. If no number | |
| // given, will do 5 iterations. | |
| function fibonacci(iterations) { | |
| // create and initialize new array to hold our results | |
| var fibArray = new Array(); | |
| var prevNum = 0; | |
| var thisNum = 0; | |
| var nextNum = 0; | |
| // console.log(prevNum) | |
| for (i=0; i<iterations; ++i) { | |
| fibArray.push(prevNum); | |
| // console.log("\tprevNum = " + prevNum); | |
| if (prevNum == 0) { | |
| thisNum = 1; | |
| } | |
| // console.log("iteration # " + (i+1) + ": "); | |
| // console.log("\tthisNum = " + thisNum); | |
| nextNum = prevNum + thisNum; | |
| // console.log("\tnextNum = " + nextNum); | |
| prevNum = thisNum; | |
| thisNum = nextNum; | |
| } | |
| console.info("fibArray(" + iterations + ") = " + fibArray); | |
| return fibArray; | |
| } | |
| fibonacci(0); | |
| fibonacci(3); | |
| fibonacci(5); | |
| fibonacci(10); | |
| fibonacci(21); | |
| // define test radius | |
| var radius = 3; | |
| // define long decimal floating point number | |
| var fpnum = 1.458398594859; | |
| // define three integers as values for comparisons | |
| var num1 = 34; | |
| var num2 = 14; | |
| var num3 = 25; | |
| // define 3 floating point numbers for comparison | |
| var fp1 = 3443.993924546545; | |
| var fp2 = 2.656563565565; | |
| var fp3 = 2.6565651205051; | |
| /* | |
| WRITE TO PAGE | |
| */ | |
| var out = ''; // var to accumulate output | |
| // Round | |
| out += "<b>TESTING: round()</b><br />"; | |
| out += "<span>" + fpnum + " rounded = <span class='ans'>" + round(fpnum) + "</span></span><hr />"; | |
| // Max of 3 | |
| out += "<b>TESTING: maxOf3()</b><br />" | |
| out += "<span>Of these 3 values [" + num1 + "," + num2 + "," + num3 + | |
| "], <span class='ans'>" + maxOf3(num1,num2,num3) + "</span> is GREATEST</span><hr />"; | |
| // Min of 3 INTEGERS | |
| out += "<b>TESTING: minOf3() with INTEGERS</b><br />" | |
| out += "<span>Of these 3 values [" + num1 + "," + num2 + "," + num3 + | |
| "], <span class='ans'>" + minOf3(num1,num2,num3) + "</span> is SMALLEST</span><hr />"; | |
| // Min of 3 FLOATING POINT numbers | |
| out += "<b>TESTING: minOf3() with FLOATING POINT numbers</b><br />" | |
| out += "<span>Of these 3 values [" + fp1 + ", " + fp2 + | |
| ", " + fp3 + "], <span class='ans'>" + | |
| minOf3(fp1,fp2,fp3) + | |
| "</span> is SMALLEST</span><hr />"; | |
| // Circle Area | |
| out += "<b>TESTING: circleArea()</b><br />" | |
| out += "<span>If RADIUS = " + radius + | |
| ", then area = <span class='ans'>" + circleArea(radius) + | |
| "</span></span><hr />"; | |
| // Circle Circumference | |
| out += "<b>TESTING: circumference()</b><br />" | |
| out += "<span>If RADIUS = " + radius + | |
| ", then circumference = <span class='ans'>" + circumference(radius) + | |
| "</span></span><hr />"; | |
| // write everything to browser | |
| document.write(out); | |
| /* | |
| NOTES: | |
| * 2015.05.09 - ALL WORKS! | |
| * Fibonacci works!!!! :) | |
| */ | |
| </script> | |
| </body> | |
| </html> |
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