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Logical Operators
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In many respects logical operators are similar to relational operators because they also have Boolean resolutions Table 3-5 shows the three logical operators used in C# As with relational operators, you will find logical operators used a good deal in conditional statements They are essential when you want to test more than a single condition For example, if you want to plan a ski trip, you might want to know whether
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The second string is greater than the first string The first string is greater than the second string Both are equal
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Table 3-4
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3: C# and ASPNET 35
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&& || !
Description
logical AND logical OR logical NOT
Table 3-5
Logical Operators
the temperature is cold enough to sustain snow and whether snow is actually on the ground So you might have code like the following:
bool temp = true; bool snow = true; bool both = (temp && snow); //both resolves to true
If you only wanted one or the other to be true, you would use the statement
bool either = (temp || snow);
For the most part, you will be using the kinds of basic operators discussed in this section C# also has bitwise operators that you re unlikely to use unless you re familiar with binary math
Symbols in Grammar and Punctuators
The grammar and punctuator symbols are similar to those found in other modern computer languages Table 3-6 shows the main symbols not used as operators and how they are used in C# Symbol
; , {} [] () // /* */ :
Description
Statement terminator; also element delimiter in for statement Element separator in arrays Open and close conditional statements, loops, functions, and classes Array element delimiter Parameter delimiters Single-line comment Block comment Case delimiters in switch statement Also used in class declaration to inherit a super class
Table 3-6
Key Punctuation and Grammar Symbols
ASPNET 35: A Beginner s Guide
Most of the grammar and punctuation are best understood in the context of their use, even when using a partial listing of all grammar and punctuation symbols as in Table 3-6 In looking at the different structures in C#, note how these symbols are correctly employed
Conditional Statements
From looking at the different operators, you can see that the bulk of the outcomes, when comparisons are made, are going to be Boolean Essentially, a conditional statement uses a Boolean to take one path or another Often, the condition is nothing more than to do something or not to do something However, at other times a conditional statement needs to choose between one branch or another
If and Else
The most basic conditional statement is the if statement Its format is the following:
if(condition) { //do something }
The condition is an expression using a relational operator such as varA > varB or Boolean For example, the following uses a Boolean to determine whether Mary is younger than Jake:
int Mary = 20; int Jake = 21; bool compare = (Mary < Jake); if(compare) { //output Mary is younger than Jake }
With a single condition to test, you can set up two specific outcomes using the else statement in the following format:
if(condition) { //take path A } else { //take path B }
3: C# and ASPNET 35
The following example uses two ASPNET text boxes, and depending on the outcome, in the C# portion of the script an if/else statement determines which of the two values is greater
ASPNET# SimpleIf
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="SimpleIfaspxcs" Inherits="SimpleIf" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 10 Transitional//EN" "http://wwww3org/TR/xhtml1/DTD/xhtml1-transitionaldtd"> <html xmlns="http://wwww3org/1999/xhtml"> <head runat="server"> <title>Simple Conditional</title> </head> <body> <form id="form1" runat="server"> <div> <asp:TextBox ID="TextBox1" runat="server"/> Number 1 <p/> <asp:TextBox ID="TextBox2" runat="server"/> Number 2 <p/> <asp:Button ID="Compare" runat="server" Text="Compare" onclick="DoCompare" /> <p/> </div> </form> </body> </html>
C# SimpleIf
using System; public partial class SimpleIf : SystemWebUIPage { private int n1; private int n2; protected void DoCompare(object sender, EventArgs e) { n1 = ConvertToInt16(TextBox1Text); n2 = ConvertToInt16(TextBox2Text); if (n1 > n2) { TextBox1Text = n1 + " is greater"; }
ASPNET 35: A Beginner s Guide
else { TextBox2Text = n2 + " is greater"; } } }
When you test the script, enter two different integers; which one is greater shows in the text box, as shown in Figure 3-1 To handle more than a single condition, you can use a series of if or else if statements using the following format:
if(conditionA) { //do A } else if (conditionB) { //do B }
When faced with more than a single condition to resolve, the else if statement will do the trick It can get a little messy when you have several alternative outcomes to evaluate
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