finished roman_number.c

roman_number.c

@@ -29,91 +29,33 @@ static bool rn_is_valid_subtraction(char letter, char next_letter) {
 }
 
 static int roman_char_to_int(char romanNumber) {
-    switch(romanNumber) {
-        case 'I':
-        {
-            return 1;
-        }
-        case 'V':
-        {
-            return 5;
-        }
-        case 'X':
-        {
-            return 10;
-        }
-        case 'L':
-        {
-            return 50;
-        }
-        case 'C':
-        {
-            return 100;
-        }
-        case 'D':
-        {
-            return 500;
-        }
-        case 'M':
-        {
-            return 1000;
-        }
-        default:
-        {
-            return 0;
-        }
-    }
-}
+    const char symbols[] = "IVXLCDM";
+    const int values[] = {1, 5, 10, 50, 100, 500, 1000};
     
-static char int_to_roman_char(int number) {
-    switch(number) {
-        case 1:
-        {
-            return 'I';
+    for(int i = 0; i < 7; i++) {
+        if(romanNumber == symbols[i]) return values[i];
     }
-        case 5:
-        {
-            return 'V';
-        }
-        case 10:
-        {
-            return 'X';
-        }
-        case 50:
-        {
-            return 'L';
-        }
-        case 100:
-        {
-            return 'C';
-        }
-        case 500:
-        {
-            return 'D';
-        }
-        case 1000:
-        {
-            return 'M';
-        }
-        default:
-        {
-            return 0;
-        }
-    }
-}
-
-static bool rn_is_valid_number_str(char* string_number) {
-    if(string_number == 0) {
     return 0;
 }
 
-    for(int i = 0; i < strlen(string_number); i++) {
-        if(roman_char_to_int(string_number[i]) == 0) {
-            return false;
+static char* int_to_roman(int number) {
+    if (number <= 0) {
+        return "";
+    }
+
+    char* result = (char*)calloc(MAX_ROMAN_NUMBER_COUNT, sizeof(char));
+    
+    const int values[] = {1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1};
+    const char* numerals[] = {"M", "CM", "D", "CD", "C", "XC", "L", "XL", "X", "IX", "V", "IV", "I"};
+    
+    for (int i = 0; i < 13; i++) {
+        while (number >= values[i]) {
+            strcat(result, numerals[i]);
+            number -= values[i];
         }
     }
     
-    return true;
+    return result;
 }
 
 
@@ -183,11 +125,16 @@ RomanNumber rn_gcd(RomanNumber x, RomanNumber y) {
     int intX = rn_get_value(x);
     int intY = rn_get_value(y);
 
-    int result = int_gcd(intX, intY);
-
+    if (intX < 0 || intY < 0) {
         return 0;
     }
 
+    int result = int_gcd(intX, intY);
+    char* roman_result = int_to_roman(result);
+    
+    return rn_create(roman_result);
+}
+
 int int_gcd(int x, int y) {
     if(y == 0) {
        return x;