Completed

problems/variables.js

@@ -1,53 +1,133 @@
 // ## Problem One
 
 // Age Calculator:
-//  * Store your birth year in a constant variable.
+//  * Store your birth year in a constant variable. 
+const birthYear = 1994
+console.log(birthYear)
+
 //  * Store a future year in a variable.
+let futureYear = 2090
+console.log(futureYear)
+
 //  * Calculate your 2 possible ages for that year based on the stored values.
+let ageMax= (futureYear - birthYear)
+console.log(ageMax) 
+
+let ageMin= (ageMax - 1)
+console.log(ageMin)
+
+let sentence1 = `I will be either ` 
+let sentence2 = ' or '
+let sentence3 = ' or '
+sentence = `I will be either ` + ageMin + ' or '+ ageMax + ' or '+ futureYear
+console.log(sentence)
+
+let sentence4= "I will be either " + ageMin +` or `+ ageMax +` in `+futureYear
+console.log(sentence4)
+ //
+
+
 //  * 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.
 
 // ## Problem Two
 
 // Snack Supply Calculator:
 //  * Store your current age in a variable.
+
+const currentAge = 26
+console.log(currentAge)
+
 //  * Store a maximum age in a constant variable.
+
+const maxAge = 100
+console.log(maxAge)
+
 //  * Store an estimated snack amount per day (as a number).
+let estimatedSnacks = 4
+console.log(estimatedSnacks)
+
 //  * Calculate how many snacks you would eat total, from your current age until the maximum age.
+let days = (maxAge - currentAge) * 365
+let snackNumber = days * 4
+console.log(snackNumber)
+
+let sentence5= "You will need " + snackNumber + " snacks to last you until the age of " + maxAge
+console.log(sentence5)
 //  * Log the result to the screen like this: "You will need `snackNumber` 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 
 //  * Store a radius into a variable.
+
+let radius = 4
+
 //  * Calculate the circumference based on the radius, and log "The circumference is `circumferenceResult`".
+let circumference = 2 * 3.14 * radius
+
 //  * Calculate the area based on the radius, and log "The area is `areaOfCircle`".
 //  * Hint: https://www.w3schools.com/jsref/jsref_pi.asp
 
+let areaOfCircle = 3.14 * (radius**2) 
+console.log ("The area is " + areaOfCircle + " The circumference is " + circumference)
+
+
+
 // ## Problem Four
 
 // Temperature Converter:
 //  * Store a celsius temperature into a variable.
+let celsius = 32
 //  * Convert it to fahrenheit and output "`tempInCelsius`°C is `tempInFahrenheit`°F".
+let tempInFahrenheit = (celsius * 9/5) + 32
+console.log ('The temp ' + celsius + ' degrees in celsius is ' + tempInFahrenheit + ' degrees in fahrenheit')
+
 //  * Now store a fahrenheit temperature into a variable.
-//  * Convert it to celsius and output "`tempInFahrenheit`°F is `tempInCelsius`°C."
+let fahrenheit = 89
 
 
+//  * Convert it to celsius and output "`tempInFahrenheit`°F is `tempInCelsius`°C."
+tempInCelsius = (fahrenheit - 32) * 5/9
+console.log('The temp ' + fahrenheit+ ' degrees in fahrenehit is ' + tempInCelsius+ ' degrees in celsius')
+
 // ## Problem Five
 
 // Grades Calculator:
 //  * Store Alices's grade on a test to a variable
+let alicesGrade = 90
+
+
 //  * Store Bob's grade on a test to a variable
+let bobsGrade = 65
+
 //  * Store Cam's grade on a test to a variable
+let camsGrade = 80
 //  * Find the average grade of all students
+let averageGrade =  (bobsGrade + alicesGrade + camsGrade)/3
+console.log(averageGrade)
+
 //  * Store Dee's grade on a test to a variable
+let deesGrade= 100
+
 //  * Find the average grade of all students
+let averageTest = (bobsGrade + alicesGrade + camsGrade + deesGrade)/4
+console.log(averageTest)
+
 //  * Print out if Dee's grade is higher than the class average
+let testSentence = "Dee's grade of " + deesGrade + " is higher than the class average "
++ averageTest
+
+console.log (testSentence)
+
 
 // ## Problem Six
 
 // Find the last number:
 // * You are given a number a. Print the last digit of a.
+let a = 122
+console.log(a%10)
+
 // * Example
 // * Input: 
 // * a = 123
@@ -82,6 +162,14 @@
 // * alice + x = y * (bob + x)
 // * Solve for alice
 
+
+let bob = 12
+let x = 5
+let y = 2
+let alice = y * (bob +x)-x
+console.log(alice)
+
+
 // ## Problem Eight
 
 // * Cat and Dog Percentages
@@ -94,6 +182,13 @@
 // * Output:
 // * 25% of the daycare animals are cats
 // * 75% of the daycare animals are dogs
+let numberOfCats = 40
+let numberOfDogs = 25
+let daycare = 65
+let percentageOfCats = (numberOfCats  * 100) /65
+let percentageOfDogs = (numberOfDogs *100)/65
+console.log( percentageOfCats, percentageOfDogs)
+
 
 // ## Problem Nine
 
@@ -106,6 +201,15 @@
 // * 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.
 
+function leapYear(year)
+{
+    return (year % 100 === 0) ? (year % 400 === 0): (year % 4 ===0)
+
+}
+console.log(leapYear(1900))
+console.log(leapYear(1731))
+console.log(leapYear(2012))
+
 
 // ## Problem Ten: Predict the output
 
@@ -116,22 +220,22 @@
 //     let num1 = 2
 //     let num2 = 5
 //     let num3 = num1 * num2
-//     console.log(num3)
+//     console.log(num3) = 10
 //     ```
 
 // b. 
 //     ```js
 //     let str = 'jel' 
 //     str += 'lo'
-//     console.log(str)
+//     console.log(str) = jello
 //     ```
 
 // c. 
 //     ```js
 //     let string =  'My favorite number is ';
 //     let number = 42
 //     let sentence = string + number
-//     console.log(typeof(sentence))
+//     console.log(typeof(sentence)) = string
 //     ```