Initial commit

vscode/Chapter02/Numbers/Program.cs

@@ -0,0 +1,52 @@
+// unsigned integer means positive whole number or 0
+uint naturalNumber = 23;
+
+// integer means negative or positive whole number or 0
+int integerNumber = -23;
+
+// float means single-precision floating point
+// F suffix makes it a float literal
+float realNumber = 2.3F;
+
+// double means double-precision floating point
+double anotherRealNumber = 2.3; // double literal
+
+// three variables that store the number 2 million
+int decimalNotation = 2_000_000;
+int binaryNotation = 0b_0001_1110_1000_0100_1000_0000;
+int hexadecimalNotation = 0x_001E_8480;
+
+// check the three variables have the same value
+// both statements output true 
+Console.WriteLine($"{decimalNotation == binaryNotation}");
+Console.WriteLine(
+  $"{decimalNotation == hexadecimalNotation}");
+
+Console.WriteLine($"int uses {sizeof(int)} bytes and can store numbers in the range {int.MinValue:N0} to {int.MaxValue:N0}.");
+Console.WriteLine($"double uses {sizeof(double)} bytes and can store numbers in the range {double.MinValue:N0} to {double.MaxValue:N0}.");
+Console.WriteLine($"decimal uses {sizeof(decimal)} bytes and can store numbers in the range {decimal.MinValue:N0} to {decimal.MaxValue:N0}.");
+
+Console.WriteLine("Using doubles:");
+double a = 0.1;
+double b = 0.2;
+if (a + b == 0.3)
+{
+  Console.WriteLine($"{a} + {b} equals {0.3}");
+}
+else
+{
+  Console.WriteLine($"{a} + {b} does NOT equal {0.3}");
+}
+
+Console.WriteLine("Using decimals:");
+decimal c = 0.1M; // M suffix means a decimal literal value
+decimal d = 0.2M;
+
+if (c + d == 0.3M)
+{
+  Console.WriteLine($"{c} + {d} equals {0.3M}");
+}
+else
+{
+  Console.WriteLine($"{c} + {d} does NOT equal {0.3M}");
+}