Implement Rankine to Celsius, Fahrenheit, and Kelvin conversion.

src/displays/app_options.go

@@ -16,6 +16,6 @@ func AppOptions() {
 	fmt.Println(Tab, " ", openBracket, optionNumber(1), closeBracket, "Celsius (°C)")
 	fmt.Println(Tab, " ", openBracket, optionNumber(2), closeBracket, "Fahrenheit (°F)")
 	fmt.Println(Tab, " ", openBracket, optionNumber(3), closeBracket, "Kelvin (°K)")
-	// fmt.Println(Tab, " ", openBracket, optionNumber(4), closeBracket, "Rankine (°R)")
-	fmt.Println(Tab, " ", openBracket, optionNumber(4), closeBracket, "Exit Application")
+	fmt.Println(Tab, " ", openBracket, optionNumber(4), closeBracket, "Rankine (°R)")
+	fmt.Println(Tab, " ", openBracket, optionNumber(5), closeBracket, "Exit Application")
 }

src/main.go

@@ -5,6 +5,7 @@ import (
 	"github.com/kentlouisetonino/tempscale/src/services/celsius"
 	"github.com/kentlouisetonino/tempscale/src/services/fahrenheit"
 	"github.com/kentlouisetonino/tempscale/src/services/kelvin"
+	"github.com/kentlouisetonino/tempscale/src/services/rankine"
 )
 
 func main() {
@@ -54,6 +55,10 @@ func main() {
 			kelvin.Conversion()
 		}
 
+		if optionInput == "4" {
+			rankine.Conversion()
+		}
+
 		if optionInput == "4" {
 			displays.ClearScreen()
 			displays.AppExit()

src/services/rankine/conversion.go

@@ -0,0 +1,67 @@
+package rankine
+
+import (
+	"fmt"
+
+	"github.com/kentlouisetonino/tempscale/src/displays"
+)
+
+func Conversion() {
+	var rankineInput float64
+	var celsiusInputError bool = false
+	var conversionMenuInput int
+	var backToMainMenu bool = false
+
+	for backToMainMenu == false {
+		// Clear the screen.
+		displays.ClearScreen()
+		displays.AddNewline()
+		displays.AddNewline()
+
+		// Show the description.
+		displays.FahrenheitOptionDescription()
+		displays.AddNewline()
+
+		// Error instruction.
+		if celsiusInputError {
+			displays.AppOptionInputError()
+			displays.AddNewline()
+		}
+
+		// Ask the celsius input.
+		fmt.Print(displays.Tab, "   ", "Rankine (°R)", displays.Tab, displays.Tab, ": ")
+		_, err := fmt.Scan(&rankineInput)
+
+		if err != nil {
+			celsiusInputError = true
+			continue
+		}
+
+		// Display the equivalent of Celsius to Fahrenheit, Kelvin, Rankine.
+		fmt.Print(displays.Tab, "   ", "Celsius (°C)", displays.Tab, displays.Tab, ": ", displays.ColorGreen, convertToCelsius(rankineInput), displays.ColorReset);
+		displays.AddNewline()
+		fmt.Print(displays.Tab, "   ", "Fahrenheit (°F)", displays.Tab, ": ", displays.ColorGreen, convertToFahrenheit(rankineInput), displays.ColorReset);
+		displays.AddNewline()
+		fmt.Print(displays.Tab, "   ", "Kelvin (°K)", displays.Tab, displays.Tab, ": ", displays.ColorGreen, convertToKelvin(rankineInput), displays.ColorReset)
+		displays.AddNewline()
+		displays.AddNewline()
+
+		// Ask if user wants to retry or go back to main menu.
+		fmt.Print(displays.Tab, "   ", displays.ColorBlue, "[1-Retry, 2-Back, Any-Exit]", displays.ColorReset, displays.Tab, ": ")
+		_, err = fmt.Scan(&conversionMenuInput)
+
+		if err != nil {
+			displays.ClearScreen()
+			displays.AppExit()
+		}
+
+		if conversionMenuInput == 1 {
+			continue
+		} else if conversionMenuInput == 2 {
+			backToMainMenu = true
+		} else {
+			displays.ClearScreen()
+			displays.AppExit()
+		}
+	}
+}

src/services/rankine/convert_to_celsius.go

@@ -0,0 +1,5 @@
+package rankine
+
+func convertToCelsius(rankine float64) float64 {
+	return (rankine - 491.67) * (5.0 / 9.0)
+}

src/services/rankine/convert_to_fahrenheit.go

@@ -0,0 +1,5 @@
+package rankine
+
+func convertToFahrenheit(rankine float64) float64 {
+	return rankine - 459.67
+}

src/services/rankine/convert_to_kelvin.go

@@ -0,0 +1,5 @@
+package rankine
+
+func convertToKelvin(rankine float64) float64 {
+	return rankine * (5.0 / 9.0)
+}