feat: convert a decimal number into a binary number

exercises/binary_converter.cpp

@@ -5,3 +5,56 @@
   Insert first number: 8
   The binary number is: 1000
 */
+
+#include <iostream>
+#include <string>
+
+int insertNumber();
+bool checkStringIsNumber(std::string in);
+std::string binaryConvert(int number);
+
+const int ZERO = 48;
+const int NINE = 57;
+const int MAX_DIGIT = 10;
+const int MINUS = 45;
+
+const std::string ERROR_COLOR = "\033[31m";
+const std::string NORMAL_COLOR = "\033[0m";
+
+int main(){
+  bool is_neg = false;
+  int number = insertNumber();
+  if(number < 0) {
+    number *= -1;
+    is_neg = true;
+  }
+  std::string convertedNumber =  binaryConvert(number);
+  std::cout << "The binary number is: " << ((is_neg) ? "1|" : "") << convertedNumber;
+}
+
+int insertNumber(){
+  std::string insert;
+  bool isCorrect = true;
+  do {
+    if(!isCorrect) std::cout << ERROR_COLOR+("[Insert a valid input] ")+NORMAL_COLOR;
+    std::cout << "Insert first number: ";
+    getline(std::cin, insert);
+  } while(!(isCorrect = checkStringIsNumber(insert)));
+
+  return std::stoi(insert);
+}
+
+bool checkStringIsNumber(std::string in){
+  if(in.empty()) return false;
+  if(in.size() > MAX_DIGIT) return false;
+  for(int i = 0; i < in.size(); i++)
+    if((in.at(i) < ZERO || in.at(i) > NINE) && in.at(i) != MINUS) return false;
+  return true;
+}
+
+std::string binaryConvert(int number){
+  if(number == 0) return "";
+  std::string temp = std::to_string(number % 2);
+  number /= 2;
+  return binaryConvert(number) + temp;
+}