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dvar = 1000; // assign dvar the value 1000 ConsoleWriteLine("Original value of ivar: " + ivar); ConsoleWriteLine("Original value of dvar: " + dvar); ConsoleWriteLine(); // print a blank line // Now, divide both by 3 ivar = ivar / 3; dvar = dvar / 30; ConsoleWriteLine("ivar after division: " + ivar); ConsoleWriteLine("dvar after division: " + dvar); } }
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Original value of ivar: 100 Original value of dvar: 100 ivar after division: 33 dvar after division: 333333333333333
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As you can see, when ivar (an int variable) is divided by 3, a whole-number division is performed, and the outcome is 33 the fractional component is lost However, when dvar (a double variable) is divided by 3, the fractional component is preserved As the program shows, when you want to specify a floating-point value in a program, you must include a decimal point If you don t, it will be interpreted as an integer For example, in C#, the value 100 is an integer, but the value 1000 is a floating-point value There is one other new thing to notice in the program To print a blank line, simply call WriteLine( ) without any arguments The floating-point data types are often used when working with real-world quantities where fractional components are commonly needed For example, this program computes the area of a circle It uses the value 31416 for pi
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// Compute the area of a circle using System; class Circle { static void Main() { double radius; double area;
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Part I:
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radius = 100; area = radius * radius * 31416; ConsoleWriteLine("Area is " + area); } }
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Area is 31416
Clearly, the computation of a circle s area could not be achieved satisfactorily without the use of floating-point data
Two Control Statements
Inside a method, execution proceeds from one statement to the next, top to bottom It is possible to alter this flow through the use of the various program control statements supported by C# Although we will look closely at control statements later, two are briefly introduced here because we will be using them to write sample programs
The if Statement
You can selectively execute part of a program through the use of C# s conditional statement: the if The if statement works in C# much like the IF statement in any other language For example, it is syntactically identical to the if statements in C, C++, and Java Its simplest form is shown here: if(condition) statement; Here, condition is a Boolean (that is, true or false) expression If condition is true, then the statement is executed If condition is false, then the statement is bypassed Here is an example:
if(10 < 11) ConsoleWriteLine("10 is less than 11");
In this case, since 10 is less than 11, the conditional expression is true, and WriteLine( ) will execute However, consider the following:
if(10 < 9) ConsoleWriteLine("this won t be displayed");
In this case, 10 is not less than 9 Thus, the call to WriteLine( ) will not take place C# defines a full complement of relational operators that can be used in a conditional expression They are shown here:
Operator < <= > >= == != Meaning Less than Less than or equal to Greater than Greater than or equal to Equal to Not equal
2:
An Overview of C#
Here is a program that illustrates the if statement:
// Demonstrate the if
PART I
using System; class IfDemo { static void Main() { int a, b, c; a = 2; b = 3; if(a < b) ConsoleWriteLine("a is less than b"); // This won t display anything if(a == b) ConsoleWriteLine("you won t see this"); ConsoleWriteLine(); c = a - b; // c contains -1 ConsoleWriteLine("c contains -1"); if(c >= 0) ConsoleWriteLine("c is non-negative"); if(c < 0) ConsoleWriteLine("c is negative"); ConsoleWriteLine(); c = b - a; // c now contains 1 ConsoleWriteLine("c contains 1"); if(c >= 0) ConsoleWriteLine("c is non-negative"); if(c < 0) ConsoleWriteLine("c is negative"); } }
The output generated by this program is shown here:
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