c++ - Pointer dereferencing -

-

इस सवाल का पहले से ही एक उत्तर है: < / P>

  • 1 उत्तर 
  char * m_chString = "asd"; Cout & lt; & lt; m_chString; // प्रिंट एड्स कूट & lt; & lt; * m_chString; // एक पूर्णांक nValue = 7; Int * pnPtr = & amp; nValue; Cout & lt; & lt; * pnPtr; // प्रिंट 7 cout & lt; & lt; pnPtr; // nValue का पता प्रिंट करता है

मैंने दो उदाहरण दिए, पहले स्ट्रिंग के पॉइंटर पॉइंट में, और दूसरे में, सूचक एक पूर्णांक मान को प्रिंट करता है।
मेरा प्रश्न यह है कि, पहला उदाहरण से क्यों cout & lt; & lt; m_chString; मेरी स्ट्रिंग का पता प्रिंट नहीं करता है दूसरे उदाहरण में अगर मैं pnPtr प्रिंट होता / रही हूं? क्या pnPtr पते को इंगित नहीं करता?

< P>

इसका कारण यह है कि std :: cout एक चार * एक संकेतक के रूप में (पहला अक्षर) को सी शैली स्ट्रिंग का इलाज करेगा और इसे प्रिंट करें।

आप इस पते को प्रिंट कर सकते हैं: - 

  cout & lt; & lt; (शून्य *) m_chString;

या यदि आप महान सी ++ प्रशंसक हैं तो 

  cout & lt; & lt; Static_cast & lt; कॉन्स्ट व्हॉइड * & gt; (M_chString);

Comments

Post a Comment

Popular posts from this blog

java - Can't add JTree to JPanel of a JInternalFrame -

-
Image
There are two panels in my JInternalframe. I want to add TopPanel to Jtree to nominate another. But I can not add Jaitari to the top of the panel. Please help me in this piece of code: DefaultMutableTreeNode root = new DefaultMutableTreeNode ("deck"); DefaultMutableTreeNode Item Clubs = New DefaultMutableTreeNode ("Club"); AddAllCard (itemClubs); Root.add (itemClubs); DefaultMutableTreeNode item = New DefaultMutableTreeNode ("Diamonds"); AddAllCard (itemDiamonds); Root.add (itemDiamonds); DefaultMutableTreeNode Itemspads = New DefaultMutableTreeNode ("Spades"); AddAllCard (itemSpades); Root.add (itemSpades); DefaultMutableTreeNode item increases = new DefaultMutableTreeNode ("heart"); AddAllCard (itemHearts); Root.add (itemHearts); Default Trimodel Tree Model = New DefaultTreeModel (Route); Tree = new jetty (tree modal); ScrollPane = new JScrollPane (tree); // scrollPane.setViewportView (tree); . ScrollPane.getViewport () add (tr...
Read more

python - Calculate STD manually using Groupby Pandas DataFrame -

-
Image
I was trying to write a solution, which is a different and a manual for calculating a mean and STD The way. I have created a = ["Apple", "Banana", "Cherry", "Apple"] B = [3,4,7,3] C = [5,4,1,4] D = [7,8,3,7] Pd DF = PD to import pandals DataFrame (index = class (4), column = list ("ABCD")) DF ["A"] = A DF ["B"] = BDF ["C"] = C DF ["D"] = D Again, I made a list of A duplication. Then I went through the group all the time of the objects and calculated the solution. import as np l = list (set (df.A)) df.groupby ('A', As_index = False) listMean = [0] * len (df.C) ListSTD = [0] * L in the LAN (df.C) X: s = np.mean (df [df ['A'] == x] for C =.) = Z = [index for index, enumerate In the object (df ['a']. Value] x == item i for z: listMean [i] = s in: s = np.std (df [df ['a'] == X] .cvalues) z = index for index, enumerate item (df ['a']. Value) if x ==...
Read more

java - @PluginTarget(Node.class) not registering as neo4j plugin -

-
Simple class below will not show as a plugin package com.danmacias neoneoteplugin ; Import java.util.ArrayList; Import java.util.list; Import org.neo4j.graphdb. *; Import org.neo4j.server.plugins *; Import org.neo4j.graphalgo *; // import org.neo4j.tooling.GlobalGraphOperations; @ Description (expansion of Neo4j server to achieve all nodes or relationships) Public class GetPaths expanded the server plugin {@ name ("breadth_first_paths") @ Description ("first wide travel traversal of specific node"). @plugin target (node ​​class) public shaky & lt; Path & gt; GetPaths (@ Source Node Graphidi) {ArrayList & lt; Path & gt; Path = new arreelist & lt; & Gt; (); Return path; }} curl return {"extension": {"GetAll": {"get_all_nodes": "http: // localhost: 7474 / db / ext / GetAll / graphdb / get_all_nodes "} ...}, But when I Node.class both conditions GraphDatabaseService I change with Class ,...
Read more