Variables Lab

problems/variables.js

@@ -7,6 +7,17 @@
 //  * For example, if you were born in 1988, then in 2026 you'll be either 37 or 38, depending on what month it is in 2026.
 //  * Log them to the screen like so: "I will be either `ageMin` or `ageMax` in `futureYear`", substituting the values.
 
+const birthYear = 1988;
+let futureYear = 2024;
+let ageMin = 35;
+let ageMax = 36;
+let string = "I will be either ";
+let string2 = " or ";
+let string3 = " in ";
+let sentence = string + ageMin + string2 + ageMax + string3 + futureYear + ".";
+console.log(sentence);
+// I will be either 35 or 36 in 2024.
+
 // ## Problem Two
 
 // Snack Supply Calculator:
@@ -16,6 +27,21 @@
 //  * Calculate how many snacks you would eat total, from your current age until the maximum age.
 //  * Log the result to the screen like this: "You will need `snackNumber` to last you until the age of `maxAge`".
 
+let myAge = 32;
+const maxAge = 100;
+let snacksPerDay = 2;
+let totalNeeded = (maxAge - myAge) * (snacksPerDay * 365);
+console.log(totalNeeded);
+// 49640
+
+let snackNumber = 49640;
+let string = "You will need ";
+let string2 = " snacks to last you until the age of ";
+let sentence = string + snackNumber + string2 + maxAge + ".";
+console.log(sentence);
+// You will need 49640 snacks to last you until the age of 100.
+
+
 // ## Problem Three
 
 // Calculate properties of a circle, using the definitions: http://math2.org/math/geometry/circles.htm 
@@ -24,6 +50,15 @@
 //  * Calculate the area based on the radius, and log "The area is `areaOfCircle`".
 //  * Hint: https://www.w3schools.com/jsref/jsref_pi.asp
 
+let radius = 3;
+let circumference = Math.PI * 2*radius;
+console.log = ("The circumference is " + circumference + ".");
+// The circumference is 18.84955592153876.
+
+let area = Math.PI * radius * radius;
+console.log = ("The area is " + area + ".");
+// The area is 28.274333882308138.
+
 // ## Problem Four
 
 // Temperature Converter:
@@ -32,6 +67,21 @@
 //  * Now store a fahrenheit temperature into a variable.
 //  * Convert it to celsius and output "`tempInFahrenheit`°F is `tempInCelsius`°C."
 
+let tempInCelsius = 30;
+let tempInFahrenheit = (tempInCelsius * 9)/5 + 32;
+let string1 = "°C is ";
+let string2 = "°F.";
+let sentence = tempInCelsius + string1 + tempInFahrenheit + string2;
+console.log(sentence);
+// 30°C is 86°F.
+
+let tempInFahrenheit = 20;
+let tempInCelsius = ((tempInFahrenheit-32)*5)/9;
+let string1 = "°F is ";
+let string2 = "°C.";
+let message = tempInFahrenheit + string1 + tempInCelsius + string2;
+console.log(message);
+// 20°F is -6.666666666666667°C.
 
 // ## Problem Five
 
@@ -44,6 +94,22 @@
 //  * Find the average grade of all students
 //  * Print out if Dee's grade is higher than the class average
 
+let aliceGrade = 70;
+let bobGrade = 80;
+let camGrade = 85;
+let averageGrade = (aliceGrade + bobGrade + camGrade) / 3;
+console.log(averageGrade);
+// 78.33333333333333
+
+let deeGrade = 90;
+let avg = (averageGrade + deeGrade)/2;
+console.log (avg);
+// 84.16666666666666
+
+let isDeeGradeAboveAvg = deeGrade > avg
+console.log('Dee\'s grade is higher than the average: ' + isDeeGradeAboveAvg)
+// Dee's grade is higher than the average: true
+
 // ## Problem Six
 
 // Find the last number:
@@ -57,6 +123,10 @@
 // Hint:
 // Use the remainder % operator.
 
+let a = 12345678;
+lastNumber = a % 10;
+console.log(lastNumber);
+// 8
 
 // ## Problem Seven
 
@@ -82,6 +152,13 @@
 // * alice + x = y * (bob + x)
 // * Solve for alice
 
+let x = 1
+let y = 3
+let bob = 12
+let alice = y * (bob + x) - 1
+console.log (alice)
+// 38
+
 // ## Problem Eight
 
 // * Cat and Dog Percentages
@@ -95,6 +172,11 @@
 // * 25% of the daycare animals are cats
 // * 75% of the daycare animals are dogs
 
+let numberOfCats = (20/80 * 100) + "% "
+let numberOfDogs = (60/80 * 100) + "% "
+console.log("The percentage of dogs in daycare is " + (numberOfDogs) + "and the percentage of cats in the class is " + (numberOfCats) + ".")
+// The percentage of dogs in daycare is 75% and the percentage of cats in the class is 25% .
+
 // ## Problem Nine
 
 // * Leap Year Calculator
@@ -106,6 +188,14 @@
 // * Years that are divisible by 100 are not leap years if they are not also divisible by 400. 
 // * For example 1900 was not a leap year, but 2000 was. Print "Leap year!" or "Not a leap year!" depending on the year you are provided.
 
+let year = 2020
+let isDivBy4 = (year % 4)
+let isDivBy100 = (year % 100)
+let isDivBy400 = (year % 400)
+
+let isLeapYear = isDivBy4 && (!isDivBy100 || isDivBy400)
+console.log ('Year ' + year + ' is a leap year! ' + isLeapYear)
+// Year 2020 is a leap year! 0
 
 // ## Problem Ten: Predict the output
 
@@ -117,7 +207,11 @@
 //     let num2 = 5
 //     let num3 = num1 * num2
 //     console.log(num3)
-//     ```
+//    ```
+
+```js
+// 10
+```
 
 // b. 
 //     ```js
@@ -126,6 +220,10 @@
 //     console.log(str)
 //     ```
 
+```js
+// jello
+```
+
 // c. 
 //     ```js
 //     let string =  'My favorite number is ';
@@ -134,4 +232,6 @@
 //     console.log(typeof(sentence))
 //     ```
 
-
+```js
+// String
+```