refactoring: Split scientificMode into two functions: scientificMode (for setup) and executeScientificFunction (handling switch case and result output). Also, isolated user's calculation choice into getNumberFromUser.

src/main/c/scientificMode.c

@@ -4,6 +4,14 @@
 #include <math.h>
 #include "taschenrechner.h"
 
+// get the number which has to be calculated
+double getNumberFromUser() {
+    double num;
+    printf("Enter a number: ");
+    scanf("%lf", &num);
+    return num;
+}
+
 // Choice for ScientificMode
 int getScientificModeChoice() {
     int choice;
@@ -103,49 +111,47 @@ void executeTrigonometricFunction(double num) {
 }
 
 
-int scientificMode(){
-
-    double num, result;
-
-    int choice;
-
-    do {
-        printf("Enter a number: ");
-        scanf("%lf", &num); // scan the number from the user
-
-        choice = getScientificModeChoice();
+void executeScientificFunction(double num, int choice) {
+    double result;
 
-        int logChoice, trigChoice;  // Move the initialization outside the loops
+    switch (choice) {
+        case 1: // Square root
+            result = squareRootFunction(num);
+            printf("Result: %lf\n", result);
+            break;
 
-        switch(choice) {
+        case 2: // Exponential
+            result = exponentialFunction(num);
+            printf("Result: %lf\n", result);
+            break;
 
-            case 1: // Square root
-                result = squareRootFunction(num);
-                printf("Result: %lf\n", result);
-                break;
+        case 3: // Logarithm
+            executeLogarithmFunction(num);
+            break;
 
-            case 2: // Exponential
-                result = exponentialFunction(num);
-                printf("Result: %lf\n", result);
-                break;
+        case 4: // Trigonometric
+            executeTrigonometricFunction(num);
+            break;
 
-            case 3: // Logarithm
-                executeLogarithmFunction(num);
-                break;
+        case 0: // Exit the loop
+            break;
 
-            case 4: // Trigonometric
-                executeTrigonometricFunction(num);
-                break;
-
-            case 0: // Exit the loop
-                break;
+        default:
+            printf("Invalid choice. Please try again.\n");
+    }
+}
 
-            default:
-                printf("Invalid choice. Please try again.\n");
 
-        }
+// scientificMode
+double scientificMode() {
+    double result;
+    int choice;
 
+    do {
+        double num = getNumberFromUser();
+        choice = getScientificModeChoice();
+        executeScientificFunction(num, choice);
     } while (choice != 0);
 
     return result;
-}
+}