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lesson#3/main.d

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+//	FUNDAMENTAL DATA TYPES
+
+//	this is a single line comment, it is ignored by the compiler
+
+/*	
+	this is a multiline comment
+	...
+	it is completely ignored by the compiler
+*/
+
+import std.stdio; 		//	standard input/output library
+
+void main() {
+	// 3 basic types: integers, floating-point, characters
+
+	//	basic data types
+	int a;				//	declaration of a variable
+	float b = 12.5;		//	initialization and declaration
+	double c;			//	double precision of float
+	char e;				//	a single character
+	char letterA = 'A';
+
+	//	outputing the value of variable b
+	writeln("The value of b: ", b);
+	writeln("The value of letterA: ", letterA);
+
+	// outputting multiple values
+	int num = 115;
+	int num2 = num;
+	int num3 = num2;
+	writeln("Num=", num, " Num2=", num2, " Num3=", num3);
+
+	writeln(); // a new line
+
+	// integer types
+	/*
+		signed types (positive and negative):
+		byte 	1 bytes
+		short	2 ...
+		int 	4 ...
+		long 	8 bytes
+
+		usigned types (only positive):
+		ubyte 	1 bytes
+		ushort 	2 ...
+		uint	4 ...
+		ulong 	8 bytes
+	*/
+
+
+	//	properties of types
+	writeln("Name of the type : ", int.stringof);
+	writeln("Size in bytes: ", int.sizeof);
+	writeln("Min value : ", int.min);
+	writeln("Max value : ", int.max);
+	writeln("Initial value : ", int.init);
+
+	/*
+		Exercise:
+			Check out what are the initial values of float, double, char.
+			Write a comment about what you found.
+	*/
+
+}