C--, CIN and cout input and output formats

CIN and cout input and output formats

Input

　　　 1;. Cin

Enter end condition: Encounter Enter, Space, Tab key.

int A;
>> A;

Signed input, such as input (A,B,C)

int>>1','>> b;

　　　　 2> . Cin.get(array name, length, Terminator)

Where the Terminator is an optional parameter, the number of characters read into is (length-1), The Terminator specifies the end string read characters, the default is Enter,ch=cin.get () and Cin.get (CH) equivalent.

 //  cin.get  (C1, 8 ,  " q  ); //  "asdf" encountered ' Q ' end, read up to 7 characters!!!  cin. get     (C2); //  get the character "Q"  cin.clear () cout  << C1 <<  Span style= "color: #800000;" > " << C2 << Endl; //  "a S" prints two characters  cout << (int ) C2 <  < Endl; // 113  

3 . Cin. getline()

Cin.getline () When the input is very long, it will cause the CIN function error, the subsequent CIN operation will no longer execute.

// enter "12345" 5);   // "1234"  reads 4 characters of cin >> ch;        // "0"  << (int) ch << endl;

Here in fact the CIN>>CH statement is not executed, because CIN error!

Output

　　　　1 bool type output

cout <<true<<"or"<<false<<endl;//1 or 0cout << Boolalpha <<true<<"or"<<false<<endl;//true or False
cout << noboolalpha << true <<" or " << false <<Endl; // 1 or 0                 cout << Boolalpha <<0<<endl;//0 Reason: 0 is not equivalent to false in cout

　　　　2 integral type output

Const int  ;        // ' ival ' is constant, so value neverchange cout <<oct << ival <<endl;        //   8 binary cout <<dec << ival <<endl;        // 017  10 binary cout <// 0x11   17.01 <<endl;        // 17.01: Not affected

cout<<Showbase<<Uppercase;// Show base when printing integral values 
cout<< Hex<<15<<Endl; // 0XF uppercase Form
cout << nouppercase;
cout <<     hex << <<Endl; // 0xf lowercase form
cout<< noshowbase; // Reset    State of the stream

　　　　3 floating-point output

cout<<Setprecision (4)<<12.345678 <<Endl;//12.35 outputs a total of four bits rounded (rounded） 
 cout << Span style= "color: #000000;" >setprecision (1012.345678  << ENDL; // 12.345678 In fact there is a rounded inside, and the result is just the same as the original value  
 cout <<  Cout.precision () << //          

cout << Setiosflags (iOS:://12 output Two-bit 

C--, CIN and cout input and output formats