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first check a value before you take action on it, avoiding the possibility of an exception. Here s a short example:
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public bool QuotientOverTwenty(float dividend, float divisor) { if ( ( divisor != 0 ) && ( dividend / divisor > 20 ) ) { return true; } return false; }
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In this code, you want to determine whether the quotient is greater than 20, but you must first make sure you are not dividing by zero (division by zero causes the system to throw an exception). With short-circuiting, the second part of the if statement (the division) will never occur if the first part is false (that is, if the divisor is zero).
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if...else Statements
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Often, you will find that you want to take one set of actions when the condition tests true, and a different set of actions when the condition tests false. This allows you to write logic such as If you are over 25 years old, then you may rent a car; otherwise, you must take the train. The otherwise portion of the logic follows the else statement. For example, you can modify Example 5-2 to print an appropriate message whether or not valueOne is greater than valueTwo, as shown in Example 5-5.
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using using using using System; System.Collections.Generic; System.Linq; System.Text;
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namespace Example_5_5_ _ _ _The_else_Statement { class Program { static void Main( ) { int valueOne = 10; int valueTwo = 20; Console.WriteLine("Testing valueOne against valueTwo..."); if (valueOne > valueTwo) { Console.WriteLine("ValueOne: {0} larger than ValueTwo: {1}", valueOne, valueTwo); } else
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{ Console.WriteLine("Nope, ValueOne: {0} is NOT larger than ValueTwo: {1}", valueOne, valueTwo); } } } }
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The output looks like this:
Testing valueOne against valueTwo... Nope, ValueOne: 10 is NOT larger than ValueTwo: 20
Because the test in the if statement fails (valueOne is not larger than valueTwo), the body of the if statement is skipped and the body of the else statement is executed. Had the test succeeded, the if statement body would execute and the else statement would be skipped.
Nested if Statements
You ve seen how to make your if statement take action for two possible options, but what if there are more than two choices In that case, you can nest if statements that is, contain one if inside another to handle complex conditions. For example, suppose you need to write a program to evaluate the temperature and specifically to return the following types of information: If the temperature is 32 degrees or lower, the program should warn you about ice on the road. If the temperature is exactly 32 degrees, the program should tell you that there may be water on the road. If the temperature is higher than 32 degrees, the program should assure you that there is no ice. There are many good ways to write this program. Example 5-6 illustrates one approach using nested if statements.
using using using using System; System.Collections.Generic; System.Linq; System.Text;
namespace Example_5_6_ _ _ _Nested_if_Statements { class Program { static void Main( )
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{ int temp = 32; if (temp <= 32) { Console.WriteLine("Warning! Ice on road!"); if (temp == 32) { Console.WriteLine("Temp exactly freezing, beware of water."); } else { Console.WriteLine("Watch for black ice! Temp: {0}", temp); } } else { Console.WriteLine("No ice; drive with confidence."); } } } }
The logic of Example 5-6 is that it tests whether the temperature is less than or equal to 32. If so, it prints a warning:
if (temp <= 32) { Console.WriteLine("Warning! Ice on road!");
The program then checks whether the temperature is equal to 32 degrees. If so, it prints one message; if not, the temperature must be less than 32, and the program prints the next message. Notice that this second if statement is nested within the first if, so the logic of the else statement is: because it has been established that the temperature is less than or equal to 32, and it isn t equal to 32, it must be less than 32. Another way you can chain together more than one possibility with if statements is to use the else if idiom. The program tests the condition in the first if statement. If that first statement is false, control passes to the else statement, which is immediately followed by another if that tests a different condition. For example, you could rewrite Example 5-6 to test whether the temperature is greater than, less than, or exactly equal to freezing with three tests, as shown in Example 5-7.
using System; using System.Collections.Generic; using System.Linq;
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