C# : .NET

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","Using System ","system","C# program that uses Math.PI","\n\nusing System;\n\nclass Program\n{\n static void Main()\n {\n double pi = ","Math.PI",";\n Console.WriteLine(pi);\n }\n}\n\n","Output","\n\n3.14159265358979","Newton."," Next, we explore a pi algorithm. Sir Isaac Newton spent a long time calculating pi to 15 decimal places. You can see that the equation defines half of pi as the sum of a fraction, expanded from 0 to infinity. ","Tip: ","This method is called Newton's approximation of pi. The C# method further down implements it.","The result"," of the formula becomes increasingly accurate the longer you calculate it. The main constraint Newton faced was time and error. My main constraint would be lack of brainpower.","ins","class","adsbygoogle","data-ad-client","ca-pub-4712093147740724","data-ad-slot","6227126509","data-ad-format","auto","br","ins","class","adsbygoogle","data-ad-client","ca-pub-4712093147740724","data-ad-slot","6227126509","data-ad-format","auto","Example 2."," I developed this program after researching the problem. This program is basically never useful in a real-world program. It has no advantage over using Math.PI. It shows the algorithm implementation. ","C# program that computes pi","\n\nusing System;\n\nclass Program\n{\n static void Main()\n {","\n // Get PI from methods shown here\n ","double d = ","PI()",";\n Console.WriteLine(\"{0:N20}\",\n d);","\n\n // Get PI from the .NET Math class constant\n ","double d2 = ","Math.PI",";\n Console.WriteLine(\"{0:N20}\",\n d2);\n }\n\n static double PI()\n {","\n // Returns PI\n ","return 2 * F(1);\n }\n\n static double F(int i)\n {","\n // Receives the call number\n ","if (i > 60)\n {","\n // Stop after 60 calls\n ","return i;\n }\n else\n {","\n // Return the running total with the new fraction added\n ","return 1 + (i / (1 + (2.0 * i))) * ","F","(i + 1);\n }\n }\n}\n\n","Output","\n\n3.14159265358979000000\n3.14159265358979000000","In this example,"," the PI method is called. Then PI calls the F method and multiplies the final result by 2. Here we calculate half of pi. The F method receives an integer that corresponds to \"k\" in Newton's formula. ","Multiply ","multiply","Divide ","divide","Int ","int","And: ","It proceeds until it has been called 60 times, which is an arbitrary limit I imposed.","Next,"," we display results. In Main, these methods are called and the result is written to the screen up to 20 digits. Finally, the const Math.PI is written in the same way to the screen. ","Console.WriteLine ","console","Weakness."," The weakness of this method is primarily in its lack of precision. It calculates many digits but the last six are not filled. They remain zeros. This is due to double's lack of precision. ","Tip: ","To overcome this, you would need a big number class, or a method that simply can find the decimal places one by one.","Double ","double","Also,"," the science fiction movies about calculating pi are not the most interesting material on this subject. You can spend a lot of time just reading about pi. Many of the approximations are listed with detail at the site for Mathematica. ","Wolfram MathWorld reference ","http://mathworld.wolfram.com/PiFormulas.html","Summary."," We first looked at the useful Math.PI constant. We then saw a way to calculate the value of pi. We learned about double precision, the string format patterns for decimal places, and how to translate a math formula into code. 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fr/TEp4f7fzuAM45DzYDUzeRcrC2bN0kO5gMo+UAh8K4vOlf84x65nO1CN59BZqcMy9TJx/d/44o7kX9yuRaL/DhMdkm36fCXYX0zIo2m1Mq6Bo9zEtgqLdx7QozmG/yGTgqEk/xzSmotm9TCv+ZP5nmSSg+teGH9U/EvuFGjU3drsAAAAASUVORK5CYII=)"]