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The C# Language
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ConsoleWriteLine(); if(a if(a if(a if(a > < > < c) c) b) b) ConsoleWriteLine("a ConsoleWriteLine("a ConsoleWriteLine("a ConsoleWriteLine("a > < > < c c b b is is is is true"); true"); true"); true");
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if(a > d) ConsoleWriteLine("a > d is true"); else if(a < d) ConsoleWriteLine("a < d is true"); else ConsoleWriteLine("a and d are same distance from origin"); } }
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The output from this program is shown here:
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Here Here Here Here is is is is a: b: c: d: 5, 6, 7 10, 10, 10 1, 2, 3 6, 7, 5
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a > c is true a < b is true a and d are same distance from origin
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An important restriction applies to overloading the relational operators: You must overload them in pairs For example, if you overload <, you must also overload >, and vice versa The operator pairs are
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== < <= != > >=
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One other point: If you overload the = = and != operators, then you will usually need to override ObjectEquals( ) and ObjectGetHashCode( ) These methods and the technique of overriding are discussed in 11
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Overloading true and false
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The keywords true and false can also be used as unary operators for the purposes of overloading Overloaded versions of these operators provide custom determinations of true and false relative to classes that you create Once true and false are overloaded for a class, you can use objects of that class to control the if, while, for, and do-while statements, or in a expression The true and false operators must be overloaded as a pair You cannot overload just one Both are unary operators and they have this general form: public static bool operator true(param-type operand) { // return true or false }
9:
Operator Overloading
public static bool operator false(param-type operand) { // return true or false } Notice that each returns a bool result The following example shows how true and false can be implemented for the ThreeD class Each assumes that a ThreeD object is true if at least one coordinate is non-zero If all three coordinates are zero, then the object is false The decrement operator is also implemented for the purpose of illustration
// Overload true and false for ThreeD using System; // A three-dimensional coordinate class class ThreeD { int x, y, z; // 3-D coordinates public ThreeD() { x = y = z = 0; } public ThreeD(int i, int j, int k) { x = i; y = j; z = k; } // Overload true public static bool operator true(ThreeD op) { if((opx != 0) || (opy != 0) || (opz != 0)) return true; // at least one coordinate is non-zero else return false; } // Overload false public static bool operator false(ThreeD op) { if((opx == 0) && (opy == 0) && (opz == 0)) return true; // all coordinates are zero else return false; } // Overload unary -- public static ThreeD operator --(ThreeD op) { ThreeD result = new ThreeD(); // Return the decremented result resultx = opx - 1; resulty = opy - 1; resultz = opz - 1; return result; } // Show X, Y, Z coordinates public void Show() {
PART I PART I PART I
Part I:
The C# Language
ConsoleWriteLine(x + ", " + y + ", " + z); } } class TrueFalseDemo { static void Main() { ThreeD a = new ThreeD(5, 6, 7); ThreeD b = new ThreeD(10, 10, 10); ThreeD c = new ThreeD(0, 0, 0); ConsoleWrite("Here is a: "); aShow(); ConsoleWrite("Here is b: "); bShow(); ConsoleWrite("Here is c: "); cShow(); ConsoleWriteLine(); if(a) ConsoleWriteLine("a is true"); else ConsoleWriteLine("a is false"); if(b) ConsoleWriteLine("b is true"); else ConsoleWriteLine("b is false"); if(c) ConsoleWriteLine("c is true"); else ConsoleWriteLine("c is false"); ConsoleWriteLine(); ConsoleWriteLine("Control a loop using a ThreeD object"); do { bShow(); b--; } while(b); } }
The output is shown here:
Here is a: 5, 6, 7 Here is b: 10, 10, 10 Here is c: 0, 0, 0 a is true b is true c is false Control a loop using a ThreeD object 10, 10, 10 9, 9, 9 8, 8, 8 7, 7, 7 6, 6, 6 5, 5, 5
9:
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