c - getchar() and putchar() -


उदाहरण में: 

  #include & lt; stdio.h & gt; मुख्य () {लंबे एनसी; एनसी = 0; जबकि (getchar ()! = EOF) ++ एनसी; Printf ("% ld \ n", nc); }

मुझे काफी समझ में नहीं आता। Putchar () ने चरित्र को बाहर रखा होगा, लेकिन यह क्यों है कि ईओएफ के बाद यह सभी पात्रों को बाहर रखता है, और यह इन सभी पात्रों को याद कहां है? धन्यवाद।

इसे बफरिंग कहा जाता है और यह ऑपरेटिंग सिस्टम द्वारा किया जाता है। आम तौर पर यह लाइन बफरिंग करता है, जहां यह हर वर्ण को याद रखता है जिसे आप स्मृति में डालते हैं, और फिर इसे फ़ाइल में लिखते हैं, जब यह लाइन ब्रेक का सामना करता है यह संसाधनों पर बचाता है क्योंकि फ़ाइल संचालन अन्य कार्यों से ज्यादा समय लेता है। इसलिए हर एक चरित्र के साथ आउटपुट करने के बजाय, यह बफर में एकत्र करने के लिए वर्णों का एक गुच्छा का इंतजार करता है और एक बार में उन्हें लिखता है।

यह ओएस द्वारा किया गया एक चालाक पैंतरे वाला है जो आप, प्रोग्रामर, को इसके बारे में चिंता करने की जरूरत नहीं है बस अपने पात्रों को एक-एक करके फेंक दो और ओएस को अपने तरीके से बाकी तरीके से संभालें।


Comments

Post a Comment

Popular posts from this blog

sql - dynamically varied number of conditions in the 'where' statement using LINQ -

I am using my first project LINQ (in mvc), so maybe there's something very simple that I remember. However, a day of searching and experimenting does not work, so it works. I am trying to write a LINQ query (Linux to SQL) in which in many cases where the statement is different from an OR or an AND. We do not know how many conditions are going in the query till runtime. This search is for filter control, where the user can choose multiple criteria for filtering. Select from table where table.col = 1 or table.col = 2 or table.col = 7 .... 'Other number of conditions Before I just create the SQL query as a string, while looping over all the situations. However, it seems that there should be a good way to do this in LINQ. I tried to use Expression trees, but they had a second thought for this moment on my head, where the lambda function was to be executed inside the statement such as: values ​​for matchingRows = matchingRows for each value Where (function (row) row.c...
Read more

c++ - QtQuick: QQmlApplicationEngine failed to load component qrc:/main.qml:23 Invalid attached object assignment -

Looking at my thoughts below, am I barking the wrong tree? Or in the information given below, am I misusing the Qt API to get an error in the title? I'm trying to modify the sample to work with the default coefficic project generated from Qt Creator 3.3.0 (OpenSource). Qt 5.4.0 (GCC 4.6.1, 64bit) Based on. The first thing to look at after the code is that I stand by: The sample uses the main.cpp: qmlRegisterType & lt ; Squircle & gt; ("OpenGLUARMM", 1, 0, "Squircle"); QQuickView view; View.setResizeMode (QQuickView :: SizeRootObjectToView); View.setSource (QUrl ("QRC: ///scenegraph/openglunderqml/main.qml")); View.show (); Some name changes in my name. CPP qmlRegisterType & lt; Menuscreen & gt; ("OpenGLUnderQML", 1, 0, "Main Screen"); QQmlApplicationEngine engine; Engine.load (QUrl (QStringLiteral ("QRC: /main.qml"))); I'm not sure that the difference in using QQmlApplicationEngine...
Read more

asp.net mvc - Dynamically Generated Ajax.BeginForm -

I have a problem with ASP.NET MVC Ajax forms. I generate many Ajax form in a table such as: & Lt; Input type = "submit" name = "activity" value = "add activity" / & gt; & Lt;%}% & gt; & Lt; / TD & gt; & Lt; / TR & gt; & Lt;%}% & gt; So far so good. When I post one of those forms, it gives a partial view in a div, and in this new partial view a new Ajax Beginnform (which is not in Genesis form) This second Ajax Beginnorf is exactly like the ones I got on the table, but when I post it, I do not get the "Ajax Post", but a normal post that sends me to a new page, I do not know whether the two Ajax forms What is the reason for the difference between, why is it the "dynamically generated" Ajax form behaves like a normal HTML form? By the way, I know that I can do it in different ways using javascript, but I would like to understand whether it can only be done using MVC helplars and Ajax lib...
Read more