Implement kelvin conversion to other scale.

src/main.c

@@ -6,6 +6,7 @@
 #include "inputs/app_option.h"
 #include "scales/celsius_option.h"
 #include "scales/fahrenheit_option.h"
+#include "scales/kelvin_option.h"
 #include <stdio.h>
 
 int main(void) {
@@ -51,6 +52,10 @@ int main(void) {
       invalid_option = 0;
       fahrenheit_option();
       continue;
+    } else if (option == 3) {
+      invalid_option = 0;
+      kelvin_option();
+      continue;
     };
 
     break;

src/scales/kelvin_description.c

@@ -0,0 +1,17 @@
+#include "../displays/ansi_color_codes.h"
+#include "../displays/clear_screen.h"
+#include "../displays/escape_sequence.h"
+
+void kelvin_description(void) {
+  add_new_tab();
+  printf("%s--------------------------------------------------%s", BLUE, RESET);
+  add_new_line();
+  add_new_line();
+  add_new_tab();
+  add_new_tab();
+  printf("    %sKelvin (°K) to Other Scale%s", GREEN, RESET);
+  add_new_line();
+  add_new_line();
+  add_new_tab();
+  printf("%s--------------------------------------------------%s", BLUE, RESET);
+}

src/scales/kelvin_description.h

@@ -0,0 +1,7 @@
+#ifndef KELVIN_DESCRIPTION_H
+#define KELVIN_DESCRIPTION_H
+#include "kelvin_description.c"
+
+extern void kelvin_description(void);
+
+#endif

src/scales/kelvin_option.c

@@ -0,0 +1,86 @@
+#include "../displays/ansi_color_codes.h"
+#include "../displays/clear_screen.h"
+#include "../displays/escape_sequence.h"
+#include "check_valid_input.h"
+#include "kelvin_description.h"
+
+void kelvin_option(void) {
+  char *kelvin_string = malloc(sizeof(char) * 50);
+  int invalid_input = 0;
+  char *garbage_buffer = malloc(sizeof(char) * 50);
+  int try_again = 0;
+
+  while (1) {
+    // Clean up the terminal.
+    clear_screen();
+    add_new_line();
+    add_new_line();
+
+    // Display the option description.
+    kelvin_description();
+    add_new_line();
+    add_new_line();
+
+    // Display the error message.
+    if (invalid_input) {
+      add_new_tab();
+      printf(" %sInvalid input. Please try again.%s", RED, RESET);
+      add_new_line();
+      add_new_line();
+    }
+
+    // Ask the input.
+    add_new_tab();
+    printf(" Kelvin (°K)         : ");
+    scanf("%s", kelvin_string);
+    fgets(garbage_buffer, 50, stdin);
+
+    // Check if input is valid.
+    int valid_input = check_valid_input(kelvin_string);
+    if (valid_input == 0) {
+      invalid_input = 1;
+      continue;
+    } else {
+      invalid_input = 0;
+    }
+
+    // Convert the kelvin input to double..
+    double kelvin_double = atof(kelvin_string);
+
+    // Handle computation for celsius scale.
+    double celsius = kelvin_double - 273.15;
+    add_new_tab();
+    printf(" %sCelsius (°C)%s        : %s%.4lf (°C)%s ", BLUE, RESET, YELLOW,
+           celsius, RESET);
+    add_new_line();
+
+    // Handle computation for fahrenheit scale.
+    double fahrenheit = (kelvin_double - 273.15) * (9.0 / 5.0) + 32;
+    add_new_tab();
+    printf(" %sFahrenheit (°F)%s     : %s%.4lf (°F)%s", BLUE, RESET, YELLOW,
+           fahrenheit, RESET);
+    add_new_line();
+
+    // Handle computation for rankine scale.
+    double rankine = kelvin_double * 1.8;
+    add_new_tab();
+    printf(" %sRankine (°R)%s        : %s%.4lf (°R)%s", BLUE, RESET, YELLOW,
+           rankine, RESET);
+    add_new_line();
+    add_new_line();
+
+    // Ask user if want to try again.
+    add_new_tab();
+    printf(" Try again (1-yes, 0-no): ");
+    scanf("%d", &try_again);
+    fgets(garbage_buffer, 50, stdin);
+
+    // Handle the input of user.
+    if (try_again == 1) {
+      invalid_input = 0;
+      continue;
+    } else {
+      break;
+    }
+  }
+}

src/scales/kelvin_option.h

@@ -0,0 +1,7 @@
+#ifndef KELVIN_OPTION_H
+#define KELVIN_OPTION_H
+#include "kelvin_option.c"
+
+extern void kelvin_option(void);
+
+#endif