Homework 3

javali_tests/HW3_nop90/OperatorTests/ErrorBinaryOpDifferentTypes.javali

@@ -0,0 +1,9 @@
+// The arguments of a BinaryOp (except == and !=) must be of the type specified by the operator
+
+class Main {
+	void main() {
+		int a;
+		boolean b;
+		write( a + b );
+	}
+}

javali_tests/HW3_nop90/OperatorTests/ErrorBinaryOpType.javali

@@ -0,0 +1,11 @@
+// Error: both sides of a BinaryOp (except == and !=) must be of the same type
+
+class Main {
+	void main() {
+		int a, b, c;
+		boolean d, e;
+		a = a + b;
+		d = a <= b;
+		d = b && c;
+	}
+}

javali_tests/HW3_nop90/OperatorTests/ErrorEquals.javali

@@ -0,0 +1,25 @@
+// Test the equal/not equal operations
+// this test should trigger an TYPE ERROR
+
+class Main {
+	void main() {
+		C1 a;
+		C3 d;
+		D1 f;
+		boolean x,y,z;
+		a = new C1();
+		d = new C3();
+		f = new D1();
+		
+		y = f == d;
+		x = a != f;
+	}
+}
+
+class C1 {}
+
+class C2 extends C1{}
+
+class C3 extends C2{}
+
+class D1 {}

javali_tests/HW3_nop90/OperatorTests/ErrorUnaryOp.javali

@@ -0,0 +1,19 @@
+// Test type errors with unary operator
+
+class Main {
+	void main() {
+		int x,y,z;
+		boolean a;
+		x = -100;
+		y = 5;
+		
+		a = -true;
+		z = -y;
+		x = +x;
+		write(x);
+		writeln();
+		write(z);
+		writeln();
+		write(-a);
+	}
+}

javali_tests/HW3_nop90/OperatorTests/OkBooleanAndOr.javali

@@ -0,0 +1,8 @@
+// Test boolean && and || operators
+
+class Main {
+    void main() {
+        boolean a, b, c;
+        a = b && c || a;
+    }
+}

javali_tests/HW3_nop90/OperatorTests/OkEquals.javali

@@ -0,0 +1,31 @@
+// Test the equal/not equal operations, one of the types must be a subtype of the other
+
+class Main {
+	void main() {
+		C1 c1;
+		C2 c2;
+		C3 c3;
+		Object o1, o2;
+		boolean s;
+
+		o1 = new Object();
+		o2 = new Object();
+		c1 = new C1();
+		c2 = new C2();
+		c3 = new C3();
+		
+		s = o1 == o2;
+		s = c1 != c2;
+		s = c3 == c1;
+		s = o2 != o1;
+		s = null == c2;
+		s = o1 == c2;
+		s = null == o;
+	}
+}
+
+class C1 {}
+
+class C2 extends C1{}
+
+class C3 extends C2{}

javali_tests/HW3_nop90/OperatorTests/OkNot.javali

@@ -0,0 +1,36 @@
+// Test '!' operator
+
+class Main {
+	void main() {
+		boolean a,b,c,d;
+		int x,y;
+		
+		a = true;
+		c = !false;
+		b = !a;
+		x = 100;
+		y = 5;
+		
+		if (a) {
+		write(1);}
+		writeln();
+		
+		if (!b){
+			write(2);
+		}
+		writeln();
+		
+		while(c){
+			write(3);
+			c = false;
+		}
+		writeln();
+		
+		// !x < 2 * y --> !x type error
+		// !(x < 2 * y) --> correct syntax
+		while(!(x<2*y)){
+			write(y);
+			y = y*2;
+		}
+	}
+}