fixed CPPLINT + added method 2

others/decimal_to_binary.cpp

@@ -1,25 +1,55 @@
-// This function convert decimal to binary number
-//
+/**
+ * @file
+ * @brief Function to convert decimal number to binary representation
+ */
 #include <iostream>
-using namespace std;
 
-int main()
-{
-	int number;
-	cout << "Enter a number:";
-	cin >> number;
-	int remainder, binary = 0, var = 1;
+/**
+ * This method converts the bit representation and stores it as a decimal
+ * number.
+ */
+void method1(int number) {
+    int remainder, binary = 0, var = 1;
 
-	do
-	{
-		remainder = number % 2;
-		number = number / 2;
-		binary = binary + (remainder * var);
-		var = var * 10;
-
-	} while (number > 0);
-	cout << "the binary is :";
-	cout << binary;
-	cout << endl;
-	return 0;
+    do {
+        remainder = number % 2;
+        number = number / 2;
+        binary = binary + (remainder * var);
+        var = var * 10;
+    } while (number > 0);
+    std::cout << "Method 1 : " << binary << std::endl;
+}
+
+/**
+ * This method stores each bit value from LSB to MSB and then prints them back
+ * from MSB to LSB
+ */
+void method2(int number) {
+    int num_bits = 0;
+    char bit_string[50];
+
+    do {
+        bool bit = number & 0x01;  // get last bit
+        if (bit)
+            bit_string[num_bits++] = '1';
+        else
+            bit_string[num_bits++] = '0';
+        number >>= 1;  // right shift bit 1 bit
+    } while (number > 0);
+
+    std::cout << "Method 2 : ";
+    while (num_bits >= 0)
+        std::cout << bit_string[num_bits--];  // print from MSB to LSB
+    std::cout << std::endl;
+}
+
+int main() {
+    int number;
+    std::cout << "Enter a number:";
+    std::cin >> number;
+
+    method1(number);
+    method2(number);
+
+    return 0;
 }