diff --git a/src/c/funktionen.c b/src/c/funktionen.c
index 8a5efbe..d3c77a8 100644
--- a/src/c/funktionen.c
+++ b/src/c/funktionen.c
@@ -6,27 +6,27 @@
 
 
 void welcome() {
-    char x[15];
+    char username[15];
     printf("Hallo! Wie heisst du?\n");
-    scanf("%s", &x);
-    printf("\nSchöner Name, %s!\n\n", x);
+    scanf("%s", &username);
+    printf("\nSchöner Name, %s!\n\n", username);
 }
 
 int choose_program() {
-    int i;
+    int choice;
 
-    printf("Welches der folgenden Programme moechtest du starten?\n1. Rechner.exe\n2. Gleichungen.exe\n3. TicTacToe.exe\n\n");
-    scanf("%d", &i);
+    printf("Welches der folgenden Programme moechtest du starten?\n1. Rechner.exe\n2. Gleichungen.exe\n3. TicTacToe.exe\n4. Strings.exe\n\n");
+    scanf("%d", &choice);
 
-    return i;
+    return choice;
 }
 
-int addThreeNumbers(int a, int b, int c) {
-    return a + b + c;
+int addThreeNumbers(int num1, int num2, int num3) {
+    return num1 + num2 + num3;
 }
 
-int multiply(int h, int g) {
-    return h * g;
+int multiply(int num1, int num2) {
+    return num1 * num2;
 }
 
 int subtract(int num1, int num2) {
@@ -95,7 +95,7 @@ int x_wins_02_11_20(char board[][3]) {
     }    
 }
 
-int string_character_counter(char string[]) {
+int stringCharacterCounter(char string[]) {
     int stringLength = 0;
 
     for (int i = 0; string[i] != '\0'; i++) {
@@ -108,7 +108,7 @@ int string_character_counter(char string[]) {
 int characterAppearanceInString(char c, char string[]) {
     int appear = 0;
 
-    for (int i = 0; i < string_character_counter(string); i++) {
+    for (int i = 0; i < stringCharacterCounter(string); i++) {
         if (string[i] == c) {
             appear++;
         }
@@ -117,12 +117,12 @@ int characterAppearanceInString(char c, char string[]) {
     return appear;
 }
 
-int i(int v, int r) {
-    return v / r;
+int calculateCurrent(int voltage, int resistance) {
+    return voltage / resistance;
 }
 
-int p(int f, int a) {
-    return f / a;
+int calculatePressure(int force, int area) {
+    return force / area;
 }
 
 // Function to calculate the sine of an angle in radians
@@ -331,4 +331,8 @@ float remainderValue(float x, float y) {
 
 float f(float m) {
     return m * 9.81;
+}
+
+float calculateWeight(float mass) {
+    return mass * 9.81;
 }
\ No newline at end of file
diff --git a/src/c/funktionen.h b/src/c/funktionen.h
index 7cdc807..050ff6e 100644
--- a/src/c/funktionen.h
+++ b/src/c/funktionen.h
@@ -8,10 +8,10 @@ void welcome();
 int choose_program();
 // Die choose_program() Funktion laesst den User ein Programm auswaehlen.
 
-int addThreeNumbers(int a, int b, int c);
+int addThreeNumbers(int num1, int num2, int num3);
 // gibt die Addition von drei Zahlen zurück
 
-int multiply(int h, int g);
+int multiply(int num1, int num2);
 // gibt die Multiplikation von zwei Zahlen zurueck
 
 int subtract(int num1, int num2);
@@ -47,16 +47,16 @@ int x_wins_00_11_22(char board[][3]);
 int x_wins_02_11_20(char board[][3]);
 // prüft, ob X bei Index 02, 11, 20 ist
 
-int string_character_counter(char string[]);
+int stringCharacterCounter(char string[]);
 // liefert die Länge eines Strings zurück
 
 int characterAppearanceInString(char c, char string[]);
 // liefert die Anzahl an einem bestimmten Character in einem String zurueck
 
-int i(int v, int r);
+int calculateCurrent(int voltage, int resistance);
 // berechnet den Strom mithilfe ohmsches Gesetzes
 
-int p(int f, int a);
+int calculatePressure(int force, int area);
 // berechnet den Druck
 
 // Function to calculate the sine of an angle in radians
@@ -151,7 +151,7 @@ float average(float x, float y);
 // Function to calculate the remainder of division between two numbers
 float remainderValue(float x, float y);
 
-float f(float m);
+float calculateWeight(float mass);
 // berechnet die Gewichtkraft
 
 #endif
\ No newline at end of file
diff --git a/src/test/test_funktionen.c b/src/test/test_funktionen.c
index 4094322..3b70910 100644
--- a/src/test/test_funktionen.c
+++ b/src/test/test_funktionen.c
@@ -147,7 +147,9 @@ void test_2_toThePowerOf_7(void)
     int expected = 128;
 
     /* act */
-    actual = power(2, 7);
+    int base = 2;
+    int exponent = 7;
+    actual = power(base, exponent);
 
     /* assert */
     TEST_ASSERT_EQUAL_INT(expected, actual);
@@ -282,7 +284,7 @@ void test_stringLaenge_von_Kokosnuss(void)
     char string[] = "Kokosnuss";
 
     /* act */
-    actual = string_character_counter(string);
+    actual = stringCharacterCounter(string);
 
     /* assert */
     TEST_ASSERT_EQUAL_INT(expected, actual);
@@ -311,9 +313,9 @@ void test_current_at_voltage12_resistance6(void)
     int expected = 2;
 
     /* act */
-    int v = 12;
-    int r = 6;
-    actual = i(v, r);
+    int voltage = 12;
+    int resistance = 6;
+    actual = calculateCurrent(voltage, resistance);
 
     /* assert */
     TEST_ASSERT_EQUAL_INT(expected, actual);
@@ -326,9 +328,9 @@ void test_pressure_at_force360_area12(void)
     int expected = 30;
 
     /* act */
-    int f = 360;
-    int a = 12;
-    actual = p(f, a);
+    int force = 360;
+    int area = 12;
+    actual = calculatePressure(force, area);
 
     /* assert */
     TEST_ASSERT_EQUAL_INT(expected, actual);
@@ -431,8 +433,8 @@ void test_weight_at_mass100(void)
     float expected = 981;
 
     /* act */;
-    float m = 100;
-    actual = f(m);
+    float mass = 100;
+    actual = calculateWeight(mass);
 
     /* assert */
     TEST_ASSERT_EQUAL_FLOAT(expected, actual);