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Axel/resources/zahlen.csv

@@ -1,10 +1,10 @@
-,,,,,,,,,
+13,=69+420,,,,,,,,
 1,,,,,,,,,
 123,,,,,,,,,
 ,,,,,,,,,
-,,,,,,,,,=7*6
-,,,,,,,,,=3/2
 ,,,,,,,,,
 ,,,,,,,,,
-,=41+A2,,,,,,,,
+,,,,,,,,,
+,,,,,,,,,
+,,,,,,,,,
 ,,,,,,,,,

Axel/src/de/hs_mannheim/informatik/spreadsheet/Spreadsheet.java

@@ -3,6 +3,7 @@ package de.hs_mannheim.informatik.spreadsheet;
 import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.io.PrintWriter;
+import java.util.ArrayList;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
@@ -39,8 +40,14 @@ public class Spreadsheet {
 	}
 
 	public String get(String cellName) {
-		cellName = cellName.toUpperCase();
-		return get(getRow(cellName), getCol(cellName));
+		if(containsOnlyNumbers(cellName)) {
+			return cellName;
+		}
+		else {
+			cellName = cellName.toUpperCase();
+			return get(getRow(cellName), getCol(cellName));
+		}
+		
 	}
 
 	private void put(int row, int col, String value) {
@@ -128,7 +135,7 @@ public class Spreadsheet {
 			result = "TODO"; // TODO
 		else if (!formula.isEmpty()) {
 			try {
-				result = "" + calculate(formula);
+				result = "" + calculate(formula);	//calculates the result of a "normal" algebraic expression.
 			} catch(ArithmeticException ae) {
 				result = "exc.";
 			}
@@ -149,35 +156,75 @@ public class Spreadsheet {
 		return 0;
 	}
 
-	/**
-	 * This method calculates the result of a "normal" algebraic expression. It only needs to support
-	 * expressions like =B4 or =2+A3-B2, i.e. only with int numbers and other cells and with plus,
-	 * minus, times, split only. An expression always starts with either a number or a cell name. If it 
-	 * continues, it is guaranteed that this is followed by an operator and either a number or a 
-	 * cell name again. It is NOT required to implement dot before dash or parentheses in formulas.
-	 * @param formula The expression to be evaluated.
-	 * @return The result calculated.
-	 */
-	private long calculate(String formula) throws ArithmeticException {
-		Matcher m = Pattern.compile("([A-Z][0-9]*)|[-\\+\\*/]|[0-9]*").matcher(formula);
-
-		long res = 0;
-
-		// TODO implement
-
-		// uncomment the following to see an example how the elements of a formula can be accessed
-		while (m.find()) {        // m.find() must always be used before m.group()
-			String s = m.group();
-			if (!s.isEmpty()) {
-				System.out.println(s);
+		/**
+		 * This method calculates the result of a "normal" algebraic expression. It only needs to support
+		 * expressions like =B4 or =2+A3-B2, i.e. only with int numbers and other cells and with plus,
+		 * minus, times, split only. An expression always starts with either a number or a cell name. If it 
+		 * continues, it is guaranteed that this is followed by an operator and either a number or a 
+		 * cell name again. It is NOT required to implement dot before dash or parentheses in formulas.
+		 * @param formula The expression to be evaluated.
+		 * @return The result calculated.
+		 */
+		private long calculate(String formula) throws ArithmeticException {
+			System.out.println(formula);
+			Matcher m = Pattern.compile("([A-Z][0-9]*)|[-\\+\\*/]|[0-9]*").matcher(formula);
+	
+			
+			ArrayList<String> zahlen = new ArrayList<>();
+			
+			while(m.find()) {
+				String s = m.group();
+				if (!s.isEmpty()) {
+					zahlen.add(s);
+				}
 			}
-		}
 
-		return res;
-	}
+			int ersteZahl = Integer.parseInt(get(zahlen.get(0)));
+			
+			int zweiteZahl=0;
+			
+			for (int i = 0; i < zahlen.size(); i+=2) {
+				if(i<zahlen.size()-2) {
+					String operant=zahlen.get(i+1);
+		            zweiteZahl=Integer.parseInt(get(zahlen.get(i+2)));
+		            
+		            switch(operant) {
+		            	case "+":
+		            		ersteZahl=ersteZahl+zweiteZahl;
+		            		break;
+		            		
+		            	case "-":
+		            		ersteZahl=ersteZahl-zweiteZahl;
+		            		break;
+		            		
+		            	case "*":
+		            		ersteZahl=ersteZahl*zweiteZahl;
+		            		break;
+		            		
+		            	case "/":
+		            		ersteZahl=ersteZahl/zweiteZahl;
+		            		break;
+		            }
+				}
+	        }
+			
+			System.out.print(ersteZahl);
+			System.out.println(" "); 
+			
+			return ersteZahl;
+		}
 
 	// -----
 
+	
+	/**
+	 * This method checks if a given string contains one or more digits
+	 * to make sure that the string consists of only numbers,
+	 */
+	public boolean containsOnlyNumbers(String input) {
+		return input.matches("[0-9]+");		
+	}
+	
 	public String toString() {
 		StringBuilder sb = new StringBuilder();
 
@@ -188,11 +235,11 @@ public class Spreadsheet {
 
 		int rc = 1;
 		for (Cell[] r : cells) {
-			sb.append(System.lineSeparator());
-			sb.append(String.format("%2s", rc++) + ": ");
+			sb.append(System.lineSeparator());				//newLine
+			sb.append(String.format("%2s", rc++) + ": ");	//Number:
 
 			for (Cell c : r) {
-				sb.append(c + " | ");
+				sb.append(c + " | ");						//cell value
 			}
 
 		}