Used unsigned int instead of int when converting to base-10

includes/numeric_base.hpp

@@ -3,10 +3,10 @@
 #include <string>
 
 /* Convert the given value from the given base, to base 10 */
-int to_decimal(std::string num, int from_base);
+unsigned int to_decimal(std::string num, int from_base);
 
 /* Convert the given value from base 10 to the given base */
-std::string from_decimal(int num, int to_base);
+std::string from_decimal(unsigned int num, int to_base);
 
 /* Convert the given value from 'from_base', to 'to_base' */
 std::string base_convert(std::string num, int from_base, int to_base);

numeric_base.cpp

@@ -5,10 +5,10 @@
 
 std::string possible_chars = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
 
-int to_decimal(std::string num, int from_base) {
+unsigned int to_decimal(std::string num, int from_base) {
 	char current_char = 0;
 	int index = 0;
-	int value = 0;
+	unsigned int value = 0;
 
 	/* Here, we convert 'num' to decimal (base 10) - Find the index of
 	every character in the string, in 'possible_chars' and
@@ -23,7 +23,7 @@ int to_decimal(std::string num, int from_base) {
 }
 
 /* Convert the given value from base 10 to the given base */
-std::string from_decimal(int num, int to_base) {
+std::string from_decimal(unsigned int num, int to_base) {
 	std::string return_val;
 	int val = 0;
 	while (num > 0) {
@@ -40,7 +40,7 @@ std::string from_decimal(int num, int to_base) {
 
 /* Convert the given value from 'from_base', to 'to_base' */
 std::string base_convert(std::string num, int from_base, int to_base) {
-	int temp = to_decimal(num, from_base);
+	unsigned int temp = to_decimal(num, from_base);
 	std::string result = from_decimal(temp, to_base);
 
 	return result;