Assignment finished

src/RomanNumerals.java

@@ -1,8 +1,159 @@
 
 public class RomanNumerals {
+
 	public int convertToInteger(String romanNum) {
-		// To be Implemented
+		int sum = CheckLetter(romanNum);
+		System.out.println("Return: " + sum);
+		return sum;
+	}
+
+	public int CheckLetter (String romanNum) {
+		int numerial = 0;
+		int i = 0;
+		int letterNum1 = 0;
+		int letterNum2 = 0;
+		int helpnumber = 0;
+		int leng = romanNum.length();
+		if (leng >1) {
+			if (CalculateLetters(romanNum) == -1) {
+				numerial = 0;
+			}
+
+			else {
+				if(CheckRow(romanNum) == 0){
+					while(i+1 < leng) {
+						letterNum1 = allLettersAndNumbers(romanNum.charAt(i));
+						letterNum2 = allLettersAndNumbers(romanNum.charAt(i+1));
+
+						if(letterNum1 < letterNum2) {
+							if (letterNum1 == 5 || letterNum1 == 50  || letterNum1 == 500) {
+								System.out.println("Invalid syntax");
+								return numerial=0;
+							}
+							else {
+								numerial = numerial + (letterNum2 - letterNum1);
+								i = i+2;
+							}
+						}
+
+						else {
+							if(letterNum1 == letterNum2) {
+								helpnumber = allLettersAndNumbers(romanNum.charAt(i+2));
+								if(letterNum2 < helpnumber) {
+									System.out.println("Not valid String!");
+									return 0;
+								}
+								else if(letterNum2 == helpnumber) {
+									numerial = numerial + (letterNum1 * 3);
+									i = i+2;
+								}
+								else {
+									numerial = numerial + letterNum1;
+									i = i+1;
+								}
+							}
+							else {
+								numerial = numerial + letterNum1;
+								i = i+1;
+							}
+
+						}
+
+					}
+			}
+
+
+			}
+		}
+		else if (leng == 1) {
+			numerial = allLettersAndNumbers(romanNum.charAt(i));
+		}
+		return numerial;
+	}
+
+	public int allLettersAndNumbers(char letter) {
+		if (letter == 'M'){
+			return 1000;	
+		}
+		if (letter == 'D'){
+			return 500;	
+		}
+		if (letter == 'C'){
+			return 100;	
+		}
+		if (letter == 'L'){
+			return 50;	
+		}
+		if (letter == 'X'){
+			return 10;	
+		}
+		if (letter == 'V'){
+			return 5;	
+		}
+		if (letter == 'I'){
+			return 1;	
+		}
+
 		return 0;
+	}
+
+	public int CalculateLetters(String romanNum) {
+		int count = 0;
+		int countV = 0;
+		int j = 0;
+		int y = 0;
+		for (int i=1; i < romanNum.length(); i++) {
+			if(romanNum.charAt(j) == romanNum.charAt(i)) {
+				count = count+1;
+
+				if(romanNum.charAt(i)=='M' && count > 3|| romanNum.charAt(i)=='C' && count > 3|| romanNum.charAt(i)=='X' && count > 3|| romanNum.charAt(i)=='I' && count > 3 ) {
+					System.out.println("Letter " + romanNum.charAt(i) + " is more than 3 time in row " + count);
+					return -1;
+				}
+			}
+			else {
+				count = 0;
+			}
+			j = j+1;
+
+
+		}
 
+		for (int x=1; x < romanNum.length(); x++) {
+			if(romanNum.charAt(y) == romanNum.charAt(x)) {
+				countV = countV+1;
+			}
+			if(romanNum.charAt(y)=='V' && countV >= 1 || romanNum.charAt(y)=='L' && countV >= 1 || romanNum.charAt(y)=='D'&& countV >= 1 ) {
+				System.out.println("Letter " + romanNum.charAt(y) + " is more than 1 time in row");
+				return -1;
+			}
+		}
+		return 0;
+	}
+
+	public int CheckRow(String romanNum) {
+		int i = 0;
+		int j = 1;
+		while(j < romanNum.length()) {
+			if(romanNum.charAt(i) == 'I') {
+				if(romanNum.charAt(j) =='I' || romanNum.charAt(j) =='V' || romanNum.charAt(j) =='X') return 0;
+				else return -1;
+			}
+
+			if(romanNum.charAt(i) == 'X') {
+				 if(romanNum.charAt(j) == 'X' || romanNum.charAt(j) == 'I' || romanNum.charAt(j) == 'L') return 0;
+				 else return -1;
+			}
+
+			if(romanNum.charAt(i) == 'C') {
+				if(romanNum.charAt(j) == 'C' || romanNum.charAt(j) == 'D' || romanNum.charAt(j) == 'M') return 0;
+				else return -1;
+			}
+			i = i+1;
+			j = j+1;
+		}
+		return 0;
 	}
+
+
 }

tests/TestRomanNumerals.java

@@ -6,7 +6,75 @@ public class TestRomanNumerals {
 
 	@Test
 	public void test() {
-		fail("Not yet implemented");
+		String romanNum = "MMMCM";
+		RomanNumerals rom = new RomanNumerals();
+		int sum = rom.convertToInteger(romanNum);
+
+		assertEquals(sum, 3900, sum);
+
+	}
+
+	@Test
+	public void TooManyM() {
+		String romanNum = "MMMMMMMMC";
+		RomanNumerals rom = new RomanNumerals();
+		int sum = rom.convertToInteger(romanNum);
+
+		assertEquals(sum, 0, sum);
+	}
+
+	@Test
+	public void WrongLetterWithM() {
+		String romanNum = "IM";
+		RomanNumerals rom = new RomanNumerals();
+		int sum = rom.convertToInteger(romanNum);
+
+		assertEquals(sum, 0, sum);
+	}
+
+	@Test
+	public void TooManyV() {
+		String romanNum = "VV";
+		RomanNumerals rom = new RomanNumerals();
+		int sum = rom.convertToInteger(romanNum);
+
+		assertEquals(sum, 0, sum);
+	}
+
+	@Test
+	public void SomeRow() {
+		String romanNum = "MCMIV";
+		RomanNumerals rom = new RomanNumerals();
+		int sum = rom.convertToInteger(romanNum);
+
+		assertEquals(sum, 0, sum);
+	}
+
+	@Test
+	public void SomeWrongRow() {
+		String romanNum = "MCMIIV";
+		RomanNumerals rom = new RomanNumerals();
+		int sum = rom.convertToInteger(romanNum);
+
+		assertEquals(sum, 0, sum);
+	}
+
+	@Test
+	public void IIIRow() {
+		String romanNum = "III";
+		RomanNumerals rom = new RomanNumerals();
+		int sum = rom.convertToInteger(romanNum);
+
+		assertEquals(sum, 3, sum);
+	}
+
+	@Test
+	public void VLRow() {
+		String romanNum = "VL";
+		RomanNumerals rom = new RomanNumerals();
+		int sum = rom.convertToInteger(romanNum);
+
+		assertEquals(sum, 0, sum);
 	}
 
 }