modified

algorithms/converting/binary_to_decimal.c

@@ -1,45 +1,83 @@
 // Author: Murilo Ferreira
 
 #include <stdio.h>
+#include <math.h>
 
-int binaryToDecimal(int binary) {
+// Method 1: Using iterative multiplication
+int binaryToDecimalUsingMultiplier(int binary) {
     int decimal = 0;
     int multiplier = 1;
     while (binary != 0) {
-        decimal += (binary % 10)* multiplier;
+        decimal += (binary % 10) * multiplier;
         binary /= 10;
         multiplier *= 2;
     }
     return decimal;
 }
 
-int main() {
-    int bin;
-    printf("Enter your binary number: ");
-    scanf("%d" ,&bin);
-    int dec = binaryToDecimal(bin);
-    printf("The number is: %d \n" ,dec);
-    return 0;
+// Method 2: Using pow function
+int binaryToDecimalUsingPow(long long binary) {
+    int decimal = 0, i = 0, remainder;
+    while (binary != 0) {
+        remainder = binary % 10;
+        binary /= 10;
+        decimal += remainder * pow(2, i);
+        ++i;
+    }
+    return decimal;
 }
-// added another method
-#include <math.h>
-#include <stdio.h>
-int convert(long long n);
-int main() {
-    long long n;
-    printf("Enter a binary number: ");
-    scanf("%lld", &n);
-    printf("%lld in binary = %d in decimal", n, convert(n));
-    return 0;
+
+void displayMenu() {
+    printf("\n==========================\n");
+    printf("Choose a conversion method:\n");
+    printf("1. Iterative multiplication\n");
+    printf("2. Pow function\n");
+    printf("3. Exit\n");
+    printf("==========================\n\n");
 }
 
-int convert(long long n) {
-    int dec = 0, i = 0, rem;
-    while (n != 0) {
-        rem = n % 10;
-        n /= 10;
-        dec += rem * pow(2, i);
-        ++i;
+int validateBinaryInput(long long binary) {
+    while (binary != 0) {
+        if (binary % 10 > 1) {
+            return 0;
+        }
+        binary /= 10;
+    }
+    return 1;
+}
+
+int main() {
+    int choice;
+    long long binary;
+
+    while (1) {
+        displayMenu();
+        printf("Enter your choice: ");
+        scanf("%d", &choice);
+
+        if (choice == 3) {
+            printf("Exiting program. Goodbye!\n");
+            break;
+        }
+
+        printf("Enter a binary number: ");
+        scanf("%lld", &binary);
+
+        if (!validateBinaryInput(binary)) {
+            printf("Invalid binary number. Please enter a valid binary number (only 0s and 1s).\n\n");
+            continue;
+        }
+
+        if (choice == 1) {
+            printf("Using iterative multiplication: %lld in binary = %d in decimal\n", binary, binaryToDecimalUsingMultiplier((int)binary));
+        } else if (choice == 2) {
+            printf("Using pow function: %lld in binary = %d in decimal\n", binary, binaryToDecimalUsingPow(binary));
+        } else {
+            printf("Invalid choice. Please select 1, 2, or 3.\n");
+        }
+
+        printf("\n");
     }
-    return dec;
+
+    return 0;
 }