4_Simple_Calculation_extended/Simple_Calculation_extended.c

@@ -0,0 +1,33 @@
+/* Extended means using doubles in this case, so floating point numbers can be used. Thus,
+the modulo operation is not usable anymore and has been removed. */
+
+#include <stdio.h>
+
+int main() {
+    // creating variables
+    double first = 0, second = 0, addition = 0, subtraction = 0, multiplication = 0, division = 0;
+
+    // receiving numbers from user
+    printf("Please type in the first integer: ");
+    scanf("%lf", &first);
+    printf("Please type in the second integer: ");
+    scanf("%lf", &second);
+
+    // checking numbers
+    printf("Your input: %lf and %lf\nCalculating...\n\n", first, second);
+
+    // calculating
+    addition = first + second;
+    subtraction = first - second;
+    multiplication = first * second;
+    if (second != 0) {
+        division = first / second;
+    } else {
+        printf("\nError: Dividing by 0 is not allowed. Output will be 0 for devision and modulo.\n\n");
+    }
+
+    // output of calculation
+    printf("The results are:\n+ = %lf\n- = %lf\n* = %lf\n/ = %f\n", addition, subtraction, multiplication, division);
+
+    return 0;
+}

5_Currency_Calculator/Currency_Calculator.c

@@ -0,0 +1,46 @@
+#include <stdio.h>
+
+int main() {
+    // variables
+    double amount = 0, usd = 1.09643, jpy = 148.33512; // eur = 1 as base currency
+    char currentCurrency = 0, targetCurrency;
+
+    // input
+    printf("1 EUR\n2 USD\n3 JPY\n\nPlease type in the current currency: ");
+    scanf("%i", &currentCurrency);
+    printf("Please type in the amount: ");
+    scanf("%lf", &amount);
+    printf("\n1 EUR\n2 USD\n3 JPY\n\nPlease type in the target currency: ");
+    scanf("%i", &targetCurrency);
+
+    // calculating
+    if (currentCurrency != targetCurrency) {
+        // converting to base currency
+        switch (currentCurrency) {
+            case 2:
+                amount /= usd;
+                break;
+            case 3:
+                amount /= jpy;
+                break;
+            default:
+                break;
+        }
+        // converting to target currency
+        switch (targetCurrency)
+        {
+        case 2:
+            amount *= usd;
+            break;
+        case 3:
+            amount *= jpy;
+        default:
+            break;
+        }
+    }
+
+    // output
+    printf("Amount in target currency is: %lf", amount);
+
+    return 0;
+}