Initial commit

08-numbers-and-strings/01-numbers/exercises/01/main.go

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+// For more tutorials: https://blog.learngoprogramming.com
+//
+// Copyright © 2018 Inanc Gumus
+// Learn Go Programming Course
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+//
+
+package main
+
+// ---------------------------------------------------------
+// EXERCISE
+//  1. Print the sum of 50 and 25
+//  2. Print the difference of 50 and 15.5
+//  3. Print the product of 50 and 0.5
+//  4. Print the quotient of 50 and 0.5
+//  5. Print the remainder of 25 and 3
+//  6. Print the negation of `5 + 2`
+//
+// EXPECTED OUTPUT
+//  75
+//  34.5
+//  25
+//  100
+//  1
+//  -7
+// ---------------------------------------------------------
+
+func main() {
+	// ADD YOUR CODE BELOW
+	// USE `fmt.Println` for each question
+
+	// DO NOT TOUCH THIS
+	// fmt.Println(x)
+}

08-numbers-and-strings/01-numbers/exercises/01/solution/main.go

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+// For more tutorials: https://blog.learngoprogramming.com
+//
+// Copyright © 2018 Inanc Gumus
+// Learn Go Programming Course
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+//
+
+package main
+
+import "fmt"
+
+func main() {
+	fmt.Println(50 + 25)
+	fmt.Println(50 - 15.5)
+	fmt.Println(50 * 0.5)
+	fmt.Println(50 / 0.5)
+	fmt.Println(25 % 3)
+	fmt.Println(-(5 + 2))
+}

08-numbers-and-strings/01-numbers/exercises/02/main.go

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+// For more tutorials: https://blog.learngoprogramming.com
+//
+// Copyright © 2018 Inanc Gumus
+// Learn Go Programming Course
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+//
+
+package main
+
+import "fmt"
+
+// ---------------------------------------------------------
+// EXERCISE
+//  Fix the program to print 2.5 instead of 2
+//
+// EXPECTED OUTPUT
+//  2.5
+// ---------------------------------------------------------
+
+func main() {
+	x := 5 / 2
+	fmt.Println(x)
+}

08-numbers-and-strings/01-numbers/exercises/02/solution/main.go

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+// For more tutorials: https://blog.learngoprogramming.com
+//
+// Copyright © 2018 Inanc Gumus
+// Learn Go Programming Course
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+//
+
+package main
+
+import "fmt"
+
+func main() {
+	// Below solutions are correct:
+	x := 5. / 2
+	// x := 5 / 2.
+	// x := float64(5) / 2
+	// x := 5 / float64(2)
+
+	fmt.Println(x)
+}

08-numbers-and-strings/01-numbers/exercises/03/main.go

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+// For more tutorials: https://blog.learngoprogramming.com
+//
+// Copyright © 2018 Inanc Gumus
+// Learn Go Programming Course
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+//
+
+package main
+
+import "fmt"
+
+// ---------------------------------------------------------
+// EXERCISE
+//  Change the expressions to produce the expected outputs
+//
+// RESTRICTION
+//  Use parentheses to change the precedence
+// ---------------------------------------------------------
+
+func main() {
+	// This expression should print 20
+	fmt.Println(10 + 5 - 5 - 10)
+
+	// This expression should print -16
+	fmt.Println(-10 + 0.5 - 1 + 5.5)
+
+	// This expression should print -25
+	fmt.Println(5 + 10*2 - 5)
+
+	// This expression should print 0.5
+	fmt.Println(0.5*2 - 1)
+
+	// This expression should print 24
+	fmt.Println(3 + 1/2*10 + 4)
+
+	// This expression should print 15
+	fmt.Println(10 / 2 * 10 % 7)
+}

08-numbers-and-strings/01-numbers/exercises/03/solution/main.go

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+// For more tutorials: https://blog.learngoprogramming.com
+//
+// Copyright © 2018 Inanc Gumus
+// Learn Go Programming Course
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+//
+
+package main
+
+import "fmt"
+
+func main() {
+	// 10 + 5 - 5 - 10
+	fmt.Println(10 + 5 - (5 - 10))
+
+	// -10 + 0.5 - 1 + 5.5
+	fmt.Println(-10 + 0.5 - (1 + 5.5))
+
+	// 5 + 10*2 - 5
+	fmt.Println(5 + 10*(2-5))
+
+	// 0.5*2 - 1
+	fmt.Println(0.5 * (2 - 1))
+
+	// 3 + 1/2*10 + 4
+	fmt.Println((3+1)/2*10 + 4)
+
+	// 10 / 2 * 10 % 7
+	fmt.Println(10 / 2 * (10 % 7))
+}

08-numbers-and-strings/01-numbers/exercises/04/main.go

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+// For more tutorials: https://blog.learngoprogramming.com
+//
+// Copyright © 2018 Inanc Gumus
+// Learn Go Programming Course
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+//
+
+package main
+
+// ---------------------------------------------------------
+// EXERCISE
+//  1. Increase the `counter` 5 times
+//  2. Decrease the `factor` 2 times
+//  3. Print the product of counter and factor
+//
+// RESTRICTION
+//  Use only the incdec statements
+//
+// EXPECTED OUTPUT
+//  -75
+// ---------------------------------------------------------
+
+func main() {
+	// DO NOT TOUCH THIS
+	counter, factor := 45, 0.5
+
+	// TYPE YOUR CODE BELOW
+	// ...
+
+	// LASTLY: REMOVE THE CODE BELOW
+	_, _ = counter, factor
+}

08-numbers-and-strings/01-numbers/exercises/04/solution/main.go

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+// For more tutorials: https://blog.learngoprogramming.com
+//
+// Copyright © 2018 Inanc Gumus
+// Learn Go Programming Course
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+//
+
+package main
+
+import "fmt"
+
+func main() {
+	counter, factor := 45, 0.5
+
+	counter++
+	counter++
+	counter++
+	counter++
+	counter++
+
+	factor--
+	factor--
+
+	fmt.Println(float64(counter) * factor)
+}

08-numbers-and-strings/01-numbers/exercises/05/main.go

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+// For more tutorials: https://blog.learngoprogramming.com
+//
+// Copyright © 2018 Inanc Gumus
+// Learn Go Programming Course
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+//
+
+package main
+
+import "fmt"
+
+// ---------------------------------------------------------
+// EXERCISE
+//  1. Write the simplest line of code to increase
+//     the counter variable by 1.
+//
+//  2. Write the simplest line of code to decrease
+//     the counter variable by 1.
+//
+//  3. Write the simplest line of code to increase
+//     the counter variable by 5.
+//
+//  4. Write the simplest line of code to multiply
+//     the counter variable by 10.
+//
+//  5. Write the simplest line of code to divide
+//     the counter variable by 5.
+//
+// EXPECTED OUTPUT
+//  10
+// ---------------------------------------------------------
+
+func main() {
+	// DO NOT CHANGE THE CODE BELOW
+	var counter int
+
+	// TYPE YOUR CODE HERE
+
+	// DO NOT CHANGE THE CODE BELOW
+	fmt.Println(counter)
+}

08-numbers-and-strings/01-numbers/exercises/05/solution/main.go

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+// For more tutorials: https://blog.learngoprogramming.com
+//
+// Copyright © 2018 Inanc Gumus
+// Learn Go Programming Course
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+//
+
+package main
+
+import "fmt"
+
+func main() {
+	var counter int
+
+	counter++
+	counter--
+
+	counter += 5
+	counter *= 10
+	counter /= 5
+
+	fmt.Println(counter)
+}

08-numbers-and-strings/01-numbers/exercises/06/main.go

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+// For more tutorials: https://blog.learngoprogramming.com
+//
+// Copyright © 2018 Inanc Gumus
+// Learn Go Programming Course
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+//
+
+package main
+
+import "fmt"
+
+// ---------------------------------------------------------
+// EXERCISE
+//  Simplify the code (refactor)
+//
+// RESTRICTION
+//  Use only the incdec and assignment operations
+//
+// EXPECTED OUTPUT
+//  3
+// ---------------------------------------------------------
+
+func main() {
+	width, height := 10, 2
+
+	width = width + 1
+	width = width + height
+	width = width - 1
+	width = width - height
+	width = width * 20
+	width = width / 25
+	width = width % 5
+
+	fmt.Println(width)
+}

08-numbers-and-strings/01-numbers/exercises/06/solution/main.go

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+// For more tutorials: https://blog.learngoprogramming.com
+//
+// Copyright © 2018 Inanc Gumus
+// Learn Go Programming Course
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+//
+
+package main
+
+import "fmt"
+
+func main() {
+	width, height := 10, 2
+
+	width++
+	width += height
+	width--
+	width -= height
+	width *= 20
+	width /= 25
+	width %= 5
+
+	fmt.Println(width)
+}

08-numbers-and-strings/01-numbers/exercises/07-capstone1/main.go

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+// For more tutorials: https://blog.learngoprogramming.com
+//
+// Copyright © 2018 Inanc Gumus
+// Learn Go Programming Course
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+//
+
+package main
+
+import (
+	"fmt"
+)
+
+// ---------------------------------------------------------
+// EXERCISE
+//  Calculate the area of a circle from the given radius
+//
+// CIRCLE AREA FORMULA
+//  area = πr²
+//  https://en.wikipedia.org/wiki/Area#Circles
+//
+// HINT
+//  For PI you can use `math.Pi`
+//
+// EXPECTED OUTPUT
+//  314.1592653589793
+//
+// BONUS EXERCISE!
+//   1. Print the area as 314.16
+//   2. To do that you need to use the correct Printf verb :)
+//      Instead of `%g` verb below.
+// ---------------------------------------------------------
+
+func main() {
+	var (
+		radius = 10.
+		area   float64
+	)
+
+	// ADD YOUR CODE HERE
+	// ...
+
+	// DO NOT TOUCH THIS
+	fmt.Printf("radius: %g -> area: %g\n", radius, area)
+}

08-numbers-and-strings/01-numbers/exercises/07-capstone1/solution/main.go

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+// For more tutorials: https://blog.learngoprogramming.com
+//
+// Copyright © 2018 Inanc Gumus
+// Learn Go Programming Course
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+//
+
+package main
+
+import (
+	"fmt"
+	"math"
+)
+
+func main() {
+	var (
+		radius = 10.
+		area   float64
+	)
+
+	area = math.Pi * radius * radius
+
+	fmt.Printf("radius: %g -> area: %.2f\n",
+		radius, area)
+
+	// ALTERNATIVE:
+	// math.Pow calculates the power of a float number
+	// area = math.Pi * math.Pow(radius, 2)
+}

08-numbers-and-strings/01-numbers/exercises/08-capstone2/main.go

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+// For more tutorials: https://blog.learngoprogramming.com
+//
+// Copyright © 2018 Inanc Gumus
+// Learn Go Programming Course
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+//
+
+package main
+
+import (
+	"fmt"
+)
+
+// ---------------------------------------------------------
+// EXERCISE
+//  1. Get the radius from the command-line
+//  2. Convert it to a float64
+//  3. Calculate the surface area of a sphere
+//
+// SPHERE SURFACE AREA FORMULA
+//  area = 4πr²
+//  https://en.wikipedia.org/wiki/Sphere#Surface_area
+//
+// RESTRICTION
+//  Use `math.Pow` to calculate the area
+//  Read its documentation to see how it works.
+//  https://golang.org/pkg/math/#Pow
+//
+// EXPECTED OUTPUT
+//  1256.64
+// ---------------------------------------------------------
+
+func main() {
+	var radius, area float64
+
+	// ADD YOUR CODE HERE
+	// ...
+
+	// DO NOT TOUCH THIS
+	fmt.Printf("radius: %g -> area: %.2f\n", radius, area)
+}

08-numbers-and-strings/01-numbers/exercises/08-capstone2/solution/main.go

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+// For more tutorials: https://blog.learngoprogramming.com
+//
+// Copyright © 2018 Inanc Gumus
+// Learn Go Programming Course
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+//
+
+package main
+
+import (
+	"fmt"
+	"math"
+	"os"
+	"strconv"
+)
+
+func main() {
+	var radius, area float64
+
+	radius, _ = strconv.ParseFloat(os.Args[1], 64)
+
+	area = 4 * math.Pi * math.Pow(radius, 2)
+
+	fmt.Printf("radius: %g -> area: %.2f\n",
+		radius, area)
+}

08-numbers-and-strings/01-numbers/exercises/09-capstone3/main.go

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+// For more tutorials: https://blog.learngoprogramming.com
+//
+// Copyright © 2018 Inanc Gumus
+// Learn Go Programming Course
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+//
+
+package main
+
+import (
+	"fmt"
+)
+
+// ---------------------------------------------------------
+// EXERCISE
+//  1. Get the radius from the command-line
+//  2. Convert it to a float64
+//  3. Calculate the volume of a sphere
+//
+// SPHERE VOLUME FORMULA
+//  https://en.wikipedia.org/wiki/Sphere#Enclosed_volume
+//
+// RESTRICTION
+//  Use `math.Pow` to calculate the volume
+//
+// EXPECTED OUTPUT
+//  4188.79
+// ---------------------------------------------------------
+
+func main() {
+	var radius, vol float64
+
+	// ADD YOUR CODE HERE
+	// ...
+
+	// DO NOT TOUCH THIS
+	fmt.Printf("radius: %g -> volume: %.2f\n", radius, vol)
+}

08-numbers-and-strings/01-numbers/exercises/09-capstone3/solution/main.go

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+// For more tutorials: https://blog.learngoprogramming.com
+//
+// Copyright © 2018 Inanc Gumus
+// Learn Go Programming Course
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+//
+
+package main
+
+import (
+	"fmt"
+	"math"
+	"os"
+	"strconv"
+)
+
+func main() {
+	var radius, vol float64
+
+	radius, _ = strconv.ParseFloat(os.Args[1], 64)
+
+	vol = (4 * math.Pi * math.Pow(radius, 3)) / 3
+
+	fmt.Printf("radius: %g -> volume: %.2f\n", radius, vol)
+}