variables lab

problems/variables.js

@@ -7,6 +7,12 @@
 //  * 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  myBirthYear = 1994
+let    futureYear = 2022
+let ageMin = futureYear - myBirthYear - 1
+let ageMax = futureYear - myBirthYear 
+console.log("I will either be  "+ ageMin +  " or   "+ ageMax +"  in  " + futureYear)
+
 // ## Problem Two
 
 // Snack Supply Calculator:
@@ -16,6 +22,14 @@
 //  * 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 myCurrentAge = 26
+const maxAge = 100 
+let snackAmount = 2
+let snackNumber = snackAmount * 365 * (maxAge - myCurrentAge)
+
+console.log("You will need " + snackNumber + " snacks to last you until the age of " + maxAge)
+
+
 // ## Problem Three
 
 // Calculate properties of a circle, using the definitions: http://math2.org/math/geometry/circles.htm 
@@ -24,6 +38,11 @@
 //  * Calculate the area based on the radius, and log "The area is `areaOfCircle`".
 //  * Hint: https://www.w3schools.com/jsref/jsref_pi.asp
 
+let radius = 5
+let circumferenceResult = Math.PI * (radius * 2)
+let areaOfCircle = Math.PI * radius**2
+console.log("The circumference is: " + circumferenceResult +  " and the area is: " +  areaOfCircle )
+
 // ## Problem Four
 
 // Temperature Converter:
@@ -32,6 +51,13 @@
 //  * Now store a fahrenheit temperature into a variable.
 //  * Convert it to celsius and output "`tempInFahrenheit`°F is `tempInCelsius`°C."
 
+let celsius = 0 
+let fahrenheit = 32
+let tempInCelsius = (fahrenheit - 32) / 9 * 5
+let tempInFahrenheit = (celsius * 9) / 5 + 32
+
+console.log(tempInCelsius + '\u00B0 Celsius' +  " is " + tempInFahrenheit + '\u00B0 Fahrenheit')
+console.log(tempInFahrenheit + '\u00B0 Fahrenheit' +  " is " + tempInCelsius + '\u00B0 Celsius' )
 
 // ## Problem Five
 
@@ -44,6 +70,14 @@
 //  * Find the average grade of all students
 //  * Print out if Dee's grade is higher than the class average
 
+let aliceGrade = 12
+let bobGrade = 10
+let camGrade = 11
+let averageOne = (aliceGrade + bobGrade + camGrade)/ 3
+let deeGrade = 15 
+let averageTwo = (aliceGrade + bobGrade + camGrade + deeGrade)/ 4
+console.log("Dee's grade is: " + deeGrade+ "  and the class average is: " + averageTwo + "  Dee's grade is therefore higher")
+
 // ## Problem Six
 
 // Find the last number:
@@ -54,9 +88,12 @@
 // * Output:
 // * 3
 
-// Hint:
+
+// Hint
 // Use the remainder % operator.
 
+let a = 123
+console.log("Last digit is: " + a % 10)
 
 // ## Problem Seven
 
@@ -70,6 +107,12 @@
 // * Expected values: 
 // * alice = 27
 // 
+let x = 3
+let y = 2 
+const bobAge = 12
+let aliceAge =  y*(bobAge+x)-x
+console.log("alice age one:   " + aliceAge)
+
 // * Example 2
 // * Input: 
 // * x = 1
@@ -78,10 +121,17 @@
 // * Expected values: 
 // * alice = 38
 
+let x1 = 1
+let y1 = 3 
+const bobAge1 = 12
+let aliceAge1 =  y1*(bobAge1+x1)-x1
+console.log("alice age two:   " + aliceAge1)
+
 // * Hint:
 // * alice + x = y * (bob + x)
 // * Solve for alice
 
+
 // ## Problem Eight
 
 // * Cat and Dog Percentages
@@ -95,6 +145,15 @@
 // * 25% of the daycare animals are cats
 // * 75% of the daycare animals are dogs
 
+let numberOfCats = 30
+let numberOfDogs = 60
+let sum = numberOfCats + numberOfDogs 
+let percentageOfCats = (numberOfCats/sum)*100  
+let percentageOfDogs = (numberOfDogs/sum) * 100
+console.log(Math.round(percentageOfCats) + "\u0025" + " of the daycare animals are cats." )
+console.log(Math.round(percentageOfDogs)  + "\u0025" + " of the daycare animals are dogs." )
+
+
 // ## Problem Nine
 
 // * Leap Year Calculator
@@ -106,32 +165,37 @@
 // * 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 leapYear = 2024
+let isLeapYear = leapYear % 4 && (leapYear % 100 && leapYear % 400)
+console.log((isLeapYear === 0 && "Leap Year!") || isLeapYear !== 0 && "Not a leap year!")
 
 // ## Problem Ten: Predict the output
 
 // For this section write what you think will be logged as a comment next to `console.log` like so: `console.log('Cat') //'Cat'` before running the code. Then execute your file and compare with your prediction.
 
 // a. 
-//     ```js
-//     let num1 = 2
-//     let num2 = 5
-//     let num3 = num1 * num2
-//     console.log(num3)
-//     ```
+
+    let num1 = 2
+     let num2 = 5
+     let num3 = num1 * num2
+     console.log(num3) // 10
+
 
 // b. 
-//     ```js
-//     let str = 'jel' 
-//     str += 'lo'
-//     console.log(str)
-//     ```
+
+   let str = 'jel' 
+   str += 'lo'
+   console.log(str) // jello
+
 
 // c. 
-//     ```js
-//     let string =  'My favorite number is ';
-//     let number = 42
-//     let sentence = string + number
-//     console.log(typeof(sentence))
-//     ```
+
+    let string =  'My favorite number is '
+    let number = 42
+    let sentence = string + number
+    console.log(typeof(sentence)) // string
 
 
+
+
+