fixed code bloc without return

src/main/java/Input.java

@@ -1,24 +1,13 @@
 class Example1 {
-    int instVar;
-    Example e;
-    public Example1(){}
-    int meth(int n){
-        Example e = new Example();
-        instVar = 2;
-        int i = m1(instVar).m2().m3();
-
-        return 0;
+    public int fak(int number){
+        if(number < 0){
+            return 1;
         }
-    Example m1(int n){
-        return new Example();
+        int factorial = 1;
+        int i = 0;
+        while(i < number){
+            factorial = factorial * i;
+        }
+        return factorial;
     }
 }
-
-class Example {
-    Example1 example1;
-    Example1 m(int a){
-        return new Example1();
-    }
-    Example m2(){return new Example();}
-    int m3(){return 1;}
-}

src/main/java/abstractSyntaxTree/Expression/BinaryExpression.java

@@ -46,7 +46,8 @@ public class BinaryExpression extends AbstractType implements IExpression{
             case "<=":
             case ">=":
             case "!=":
-                result.type = TypeCheckHelper.upperBound(leftType.type, rightType.type);
+                TypeCheckHelper.upperBound(leftType.type, rightType.type);
+                result.type = "boolean";
                 break;
 
             case "-":

src/main/java/abstractSyntaxTree/Statement/BlockStatement.java

@@ -93,14 +93,16 @@ public class BlockStatement extends AbstractType implements IStatement {
 
             if(typeOfCurrentStatement.type.equals("void"))
                 continue;
-            // set return of block if not known yet
 
+            // set return of block if not known yet
             if(this.returnType == null|| this.returnType == "not")
                 this.returnType = typeOfCurrentStatement.type;
 
             if (!typeOfCurrentStatement.type.equals(this.returnType))
                 throw new TypeCheckException("At least some statements of the block returns the wrong type or missing return statement.");
         }
+        if(this.returnType == null)
+            this.returnType = "void";
         result.type = this.returnType;
         setTypeCheckResult(result);
         return result;

src/main/java/abstractSyntaxTree/Statement/IfStatement.java

@@ -31,7 +31,7 @@ public class IfStatement extends AbstractType implements IStatement{
         TypeCheckResult conditionType = condition.typeCheck(methodContext, typeContext, localVars);
 
         if (!conditionType.type.equals("boolean")) {
-            throw new TypeCheckException("Condition of If-Statement should is " + conditionType.type + ", but should be boolean.");
+            throw new TypeCheckException("Condition of If-Statement is " + conditionType.type + ", but should be boolean.");
         }
 
         if(ifStatement instanceof BlockStatement blockStatement){