exercices swift

Lab - Constants and Variables.playground/Pages/1. Exercise - Constants.xcplaygroundpage/Contents.swift

@@ -3,13 +3,13 @@
 
  Declare a constant called `friends` to represent the number of friends you have on social media. Give it a value between 50 and 1000. Print out the value by referencing your constant.
  */
-
-
+let friends = 500
+print(friends)
 /*:
  Now assume you go through and remove friends that aren't active on social media. Attempt to update your `friends` constant to a lower number than it currently is. Observe what happens and then move to the next step.
  */
-
-
+//friends = 400
+print(" cannot modify a constant")
 /*:
  Does the above code compile? Why not? Print your explanation to the console using the `print` function. Go back and delete your line of code that updates the `friends` constant to a lower number so that the playground will compile properly.
  */

Lab - Constants and Variables.playground/Pages/10. App Exercise - Percent Completed.xcplaygroundpage/Contents.swift

@@ -5,12 +5,12 @@
 
  You decide that your fitness tracking app should show the user what percentage of his/her goal has been achieved so far today. Declare a variable called `percentCompleted` and set it to 0. Do not explicity assign it a type.
  */
-
+var percentCompleted: Double = 0
 
 /*:
  Imagine that partway through the day a user has taken 3,467 steps out of the 10,000 step goal. This means he/she is 34.67% of the way to his/her goal. Assign 34.67 to `percentCompleted`. Does the code compile? Go back and explicity assign a type to `percentCompleted` that will allow the code to compile.
  */
-
+percentCompleted = 34.67
 
 /*:
 

Lab - Constants and Variables.playground/Pages/2. App Exercise - Step Goal.xcplaygroundpage/Contents.swift

@@ -5,11 +5,11 @@
 
  Your fitness tracking app needs to know goal number of steps per day. Create a constant `goalSteps` and set it to 10000.
  */
-
+let goalSteps = 10000
 
 /*:
  Use two `print` functions to print two separate lines to the console. The first line should say "Your step goal for the day is:", and the second line should print the value of `goalSteps` by referencing your constant.
  */
-
-
+print("Your step goal for the day is:")
+print(goalSteps)
 //: [Previous](@previous)  |  page 2 of 10  |  [Next: Exercise - Variables](@next)

Lab - Constants and Variables.playground/Pages/3. Exercise - Variables.xcplaygroundpage/Contents.swift

@@ -3,16 +3,16 @@
 
  Declare a variable `schooling` and set it to the number of years of school that you have completed. Print `schooling` to the console.
  */
-
-
+var schooling = 18
+print(schooling)
 /*:
  Now imagine you just completed an additional year of school, and update the `schooling` variable accordingly. Print `schooling` to the console.
  */
-
-
+schooling = 19
+print(schooling)
 /*:
  Does the above code compile? Why is this different than trying to update a constant? Print your explanation to the console using the `print` function.
  */
-
+print("you can't modify a constant in lifetime of the program ")
 
 //: [Previous](@previous)  |  page 3 of 10  |  [Next: App Exercise - Step Count](@next)

Lab - Constants and Variables.playground/Pages/4. App Exercise - Step Count.xcplaygroundpage/Contents.swift

@@ -5,11 +5,12 @@
 
 Create a variable called `steps` that will keep track of the number of steps you take throughout the day. Set its initial value to 0 to represent the step count first thing in the morning. Print `steps` to the console.
  */
-
-
+var steps = 0
+print(steps)
 /*:
  Now assume the tracker has been keeping track of steps all morning, and you want to show the user the latest step count. Update `steps` to be 2000. Print `steps` to the console. Then print "Good job! You're well on your way to your daily goal."
  */
-
-
+steps = 2000
+print(steps)
+print("Good job! You're well on your way to your daily goal.")
 //: [Previous](@previous)  |  page 4 of 10  |  [Next: Exercise - Constant or Variable?](@next)

Lab - Constants and Variables.playground/Pages/5. Exercise - Constant Or Variable.xcplaygroundpage/Contents.swift

@@ -10,9 +10,9 @@
 
  For each of the metrics above, declare either a constant or a variable and assign it a value corresponding to a hypothetical post. Be sure to use proper naming conventions.
  */
-
-
-
-
-
+var likes_number = 50
+var comments = 12
+let year_created = 2020
+let month_created = 10
+let day_created = 3
 //: [Previous](@previous)  |  page 5 of 10  |  [Next: App Exercise - Fitness Tracker: Constant or Variable?](@next)

Lab - Constants and Variables.playground/Pages/6. App Exercise - Constant or Variable.xcplaygroundpage/Contents.swift

@@ -11,8 +11,8 @@
  - Goal number of steps: The user's goal for number of steps to take each day
  - Average heart rate: The user's average heart rate over the last 24 hours
  */
-
-
+let user_name = "hajar"
+let user_age = 29
 
 
 

Lab - Constants and Variables.playground/Pages/7. Exercise - Types and Type Safety.xcplaygroundpage/Contents.swift

@@ -3,21 +3,23 @@
 
  Declare two variables, one called `firstDecimal` and one called `secondDecimal`. Both should have decimal values. Look at both of their types by holding Option and clicking on the variable name.
  */
-
-
+var firstDecimal = 10
+var secondDecimal = 20
 /*:
  Declare a variable called `trueOrFalse` and give it a boolean value. Try to assign it to `firstDecimal` like so: `firstDecimal = trueOrFalse`. Does it compile? Print a statement to the console explaining why not, and remove the line of code that will not compile.
  */
-
-
+var trueOrFalse = true
+//firstDecimal = trueOrFalse
+print("you can't assign a viariable type boolean to int ")
 /*:
  Declare a variable and give it a string value. Then try to assign it to `firstDecimal`. Does it compile? Print a statement to the console explaining why not, and remove the line of code that will not compile.
  */
-
-
+var myword = "hajar"
+//firstDecimal = myword
+print("you can't assign a viariable type boolean to int ")
 /*:
  Finally, declare a variable with a whole number value. Then try to assign it to `firstDecimal`. Why won't this compile even though both variables are numbers? Print a statement to the console explaining why not, and remove the line of code that will not compile.
  */
-
+print("i didn't understand what's u mean by whole number ")
 
 //: [Previous](@previous)  |  page 7 of 10  |  [Next: App Exercise - Tracking Different Types](@next)

Lab - Constants and Variables.playground/Pages/8. App Exercise - Tracking Different Types.xcplaygroundpage/Contents.swift

@@ -6,10 +6,10 @@
 You have declared a number of constants and variables to keep track of fitness information. Declare one more variable with a boolean value called `hasMetStepGoal`.
  */
 
-
+var hasMetStepGoal = false
 /*:
  When you declared a constant for goal number of steps and a variable for current step count, you likely assigned each a value in the thousands. This can be difficult to read. Redeclare this constant and variable and, when assigning each a value in the thousands, format the number so that it is more readable.
  */
-
-
+let goal_setps = 10_000
+var current_steps = 5_000
 //: [Previous](@previous)  |  page 8 of 10  |  [Next: Exercise - Type Inference and Required Values](@next)

Lab - Constants and Variables.playground/Pages/9. Exercise - Type Inference and Required Values.xcplaygroundpage/Contents.swift

@@ -3,21 +3,22 @@
 
  Declare a variable called `name` of type `String`, but do not give it a value. Print `name` to the console. Does the code compile? Remove any code that will not compile.
  */
-
-
+var name : String
+//print(name)
 /*:
  Now assign a value to `name`, and print it to the console.
  */
-
+ name = "bijo"
+print(name)
 
 /*:
  Declare a variable called `distanceTraveled` and set it to 0. Do not give it an explicit type.
  */
-
+var distanceTraveled: Double = 0
 
 /*:
  Now assign a value of 54.3 to `distanceTraveled`. Does the code compile? Go back and set an explicit type on `distanceTraveled` so the code will compile.
  */
-
+distanceTraveled = 54.3
 
 //: [Previous](@previous)  |  page 9 of 10  |  [Next: App Exercise - Percent Completed](@next)

Lab - Control Flow.playground/Pages/1. Exercise - Logical Operators.xcplaygroundpage/Contents.swift

@@ -10,46 +10,48 @@
 
  1. `9 == 9`
  */
-
-
+print(true)
+print(9 == 9)
 /*:
  2. `9 != 9`
  */
-
-
+print(false)
+print(9 != 9)
 /*: 
  3. `47 > 90`
  */
-
-
+print(false)
+print(47 > 90)
 /*:
  4. `47 < 90`
  */
-
-
+print(true)
+print(47 < 90)
 /*:
  5. `4 <= 4`
  */
-
-
+print(true)
+print(4 <= 4)
 /*:
  6. `4 >= 5`
  */
-
-
+print(false)
+print(4 >= 5)
 /*:
  7. `(47 > 90) && (47 < 90)`
  */
 
-
+print(false)
+print((47 > 90) && (47 < 90))
 /*:
  8. `(47 > 90) || (47 < 90)`
  */
-
+print(true)
+print((47 > 90) || (47 < 90))
 
 /*:
  9. `!true`
  */
-
-
+print(false)
+print(!true)
 //: page 1 of 9  |  [Next: Exercise - If and If-Else Statements](@next)

Lab - Control Flow.playground/Pages/2. Exercise - If and If-Else Statements.xcplaygroundpage/Contents.swift

@@ -4,18 +4,35 @@
  Imagine you're creating a machine that will count your money for you and tell you how wealthy you are based on how much money you have. A variable `dollars` has been given to you with a value of 0. Write an if statement that prints "Sorry, kid. You're broke!" if `dollars` has a value of 0. Observe what is printed to the console.
  */
 var dollars = 0
-
+if(dollars == 0){
+    print("Sorry, kid. You're broke!")
+}else
+{
+    print("You've got some spending money!")
+}
 
 /*:
  `dollars` has been updated below to have a value of 10. Write an an if-else statement that prints "Sorry, kid. You're broke!" if `dollars` has a value of 0, but prints "You've got some spending money!" otherwise. Observe what is printed to the console.
  */
 dollars = 10
-
+if(dollars == 0){
+    print("Sorry, kid. You're broke!")
+}else
+{
+    print("You've got some spending money!")
+}
 
 /*:
  `dollars` has been updated below to have a value of 105. Write an an if-else-if statement that prints "Sorry, kid. You're broke!" if `dollars` has a value of 0, prints "You've got some spending money!" if `dollars` is less than 100, and prints "Looks to me like you're rich!" otherwise. Observe what is printed to the console.
  */
 dollars = 105
-
-
+if(dollars == 0){
+    print("Sorry, kid. You're broke!")
+}else if(dollars < 100)
+{
+    print("You've got some spending money!")
+}else
+{
+print("Looks to me like you're rich!")
+}
 //: [Previous](@previous)  |  page 2 of 9  |  [Next: App Exercise - Fitness Decisions](@next)

Lab - Control Flow.playground/Pages/3. App Exercise - Fitness Decisions.xcplaygroundpage/Contents.swift

@@ -5,11 +5,29 @@
 
  You want your fitness tracking app to give as much encouragement as possible to your users. Create a variable `steps` equal to the number of steps you guess you've taken today. Create a constant `stepGoal` equal to 10,000. Write an if-else statement that will print "You're almost halfway there!" if `steps` is less than half of `stepGoal`, and will print "You're over halfway there!" if `steps` is greater than half of `stepGoal`.
  */
-
+var steps = 2_219
+let stepGoal = 10_000
+if(steps < (stepGoal / 2 ))
+{
+    print("You're almost halfway there!")
+}else
+{
+    print("You're over halfway there!")
+}
 
 /*:
  Now create a new, but similar, if-else-if statement that prints "Way to get a good start today!" if `steps` is less than a tenth of `stepGoal`, prints "You're almost halfway there!" if `steps` is less than half of `stepGoal`, and prints "You're over halfway there!" if `steps` is greater than half of `stepGoal`.
  */
-
+if(steps < stepGoal / 10)
+{
+    print("Way to get a good start today!")
+}
+else if(steps < (stepGoal / 2 ))
+{
+    print("You're almost halfway there!")
+}else
+{
+    print("You're over halfway there!")
+}
 
 //: [Previous](@previous)  |  page 3 of 9  |  [Next: Exercise - Boolean Practice](@next)

Lab - Control Flow.playground/Pages/4. Exercise - Boolean Practice.xcplaygroundpage/Contents.swift

@@ -13,6 +13,13 @@ let hasFish = true
 let hasPizza = false
 let hasVegan = true
 
+if(hasVegan == true && (hasFish == true || hasPizza == true))
+{
+    print("Let's go!")
+}else
+{
+    print("Sorry, we'll have to think of somewhere else.")
+}
 
 /*:
  Imagine you're trying to decide whether or not to go on a walk. You decide that you'll go on a walk if it's not raining or if it's 82 degress or warmer and sunny out. Create a constant `isNiceWeather` that is equal to an expression that evaluates to a boolean indicating whether or not the weather is nice enough for you to go for a walk. Write an if statement that will print "I'm going for a walk!" if the weather is nice.
@@ -21,5 +28,14 @@ let temp = 82
 let isRaining = true
 let isSunny = true
 
+var isNiceWeather = false
 
+if temp == 82 && !isRaining && isSunny
+{
+    isNiceWeather = true
+}
+if(isNiceWeather)
+{
+    print("I'm going for a walk!");
+}
 //: [Previous](@previous)  |  page 4 of 9  |  [Next: App Exercise - Target Heart Rate](@next)

Lab - Control Flow.playground/Pages/5. App Exercise - Target Heart Rate.xcplaygroundpage/Contents.swift

@@ -11,5 +11,20 @@ let targetLowerBound = 120
 let targetUpperBound = 150
 let currentHR = 147
 
+let isInTarget = (currentHR > targetLowerBound) && (currentHR < targetUpperBound)
+let isBelowTarget = currentHR < targetLowerBound
+var isAboveTarget = currentHR > targetUpperBound
 
+if(isInTarget)
+{
+    print("You're right on track!")
+}
+if(isBelowTarget)
+{
+    print("You're doing great, but try to push it a bit!")
+}
+if(isAboveTarget)
+{
+ print("You're on fire! Slow it down just a bit.")
+}
 //: [Previous](@previous)  |  page 5 of 9  |  [Next: Exercise - Switch Statements](@next)