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Program Control Statements
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// Determine if a value is positive, negative, or zero using System;
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class PosNegZero { static void Main() { int i; for(i=-5; i <= 5; i++) { ConsoleWrite("Testing " + i + ": "); if(i < 0) ConsoleWriteLine("negative"); else if(i == 0) ConsoleWriteLine("no sign"); else ConsoleWriteLine("positive"); } } }
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Testing Testing Testing Testing Testing Testing Testing Testing Testing Testing Testing -5: negative -4: negative -3: negative -2: negative -1: negative 0: no sign 1: positive 2: positive 3: positive 4: positive 5: positive
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The if-else-if Ladder
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A common programming construct that is based upon the nested if is the if-else-if ladder It looks like this: if(condition) statement; else if(condition) statement; else if(condition) statement; else statement; The conditional expressions are evaluated from the top downward As soon as a true condition is found, the statement associated with it is executed, and the rest of the ladder is bypassed
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The C# Language
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If none of the conditions is true, then the final else clause will be executed The final else often acts as a default condition That is, if all other conditional tests fail, then the last else clause is executed If there is no final else and all other conditions are false, then no action will take place The following program demonstrates the if-else-if ladder It finds the smallest singledigit factor (other than 1) for a given value
// Determine smallest single-digit factor using System; class Ladder { static void Main() { int num; for(num = 2; num < 12; num++) { if((num % 2) == 0) ConsoleWriteLine("Smallest factor of " + num else if((num % 3) == 0) ConsoleWriteLine("Smallest factor of " + num else if((num % 5) == 0) ConsoleWriteLine("Smallest factor of " + num else if((num % 7) == 0) ConsoleWriteLine("Smallest factor of " + num else ConsoleWriteLine(num + " is not divisible by } } }
+ " is 2"); + " is 3"); + " is 5"); + " is 7"); 2, 3, 5, or 7");
The program produces the following output:
Smallest factor of 2 is 2 Smallest factor of 3 is 3 Smallest factor of 4 is 2 Smallest factor of 5 is 5 Smallest factor of 6 is 2 Smallest factor of 7 is 7 Smallest factor of 8 is 2 Smallest factor of 9 is 3 Smallest factor of 10 is 2 11 is not divisible by 2, 3, 5, or 7
As you can see, the else is executed only if none of the preceding if statements succeeds
The switch Statement
The second of C# s selection statements is switch The switch provides for a multiway branch Thus, it enables a program to select among several alternatives Although a series of nested if statements can perform multiway tests, for many situations the switch is a more efficient approach It works like this: The value of an expression is successively tested against a list of constants When a match is found, the statement sequence associated with that match is executed The general form of the switch statement is
5:
Program Control Statements
switch(expression) { case constant1: statement sequence break; case constant2: statement sequence break; case constant3: statement sequence break; default: statement sequence break; } The switch expression must be of an integer type, such as char, byte, short, or int, of an enumeration type, or of type string (Enumerations and the string type are described later in this book) Thus, floating-point expressions, for example, are not allowed Frequently, the expression controlling the switch is simply a variable The case constants must be of a type compatible with the expression No two case constants in the same switch can have identical values The default sequence is executed if no case constant matches the expression The default is optional; if it is not present, no action takes place if all matches fail When a match is found, the statements associated with that case are executed until the break is encountered The following program demonstrates the switch:
// Demonstrate the switch using System; class SwitchDemo { static void Main() { int i; for(i=0; i<10; i++) switch(i) { case 0: ConsoleWriteLine("i break; case 1: ConsoleWriteLine("i break; case 2: ConsoleWriteLine("i break; case 3: ConsoleWriteLine("i break;
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