Based on C + + cin, Cin.get (), Cin.getline (), Getline (), gets () function of the use of detailed _c language

1. Cin
2, Cin.get ()
3, Cin.getline ()
4, Getline ()
5, gets ()
6, GetChar ()

Attached: Cin.ignore (); Cin.get ()//skip a character such as unwanted carriage return, space, etc.

1, cin>>

Usage 1: The most basic and most commonly used use, enter a number:

#include <iostream>
using namespace Std;
Main ()
{
int a,b;
cin>>a>>b;
cout<<a+b<<endl;
}

Input: 2[carriage return]3[carriage return]
Output: 5

Note that:>> will filter out invisible characters (such as Space return, TAB, etc.)
cin>>noskipws>>input[j];//do not want to skip whitespace characters, then use NOSKIPWS flow control

Usage 2: Accept a string, the "Space", "tab", "Enter" all end

#include <iostream>
using namespace Std;
Main ()
{
Char a[20];
cin>>a;
cout<<a<<endl;
}

Input: JKLJKLJKL
Output: JKLJKLJKL

Input: JKLJKL JKLJKL//End of space
Output: JKLJKL

2, Cin.get ()

Usage 1:cin.get (character variable name) can be used to receive characters

#include <iostream>
using namespace Std;
Main ()
{
Char ch;
Ch=cin.get (); or cin.get (CH);
cout<<ch<<endl;
}

Input: JLJKLJKL
Output: J

Usage 2:cin.get (character array name, number of received characters) is used to receive a line of strings, you can receive spaces

#include <iostream>
using namespace Std;
Main ()
{
Char a[20];
Cin.get (a,20);
cout<<a<<endl;
}

Input: JKL JKL JKL
Output: JKL jkl JKL

Input: ABCDEABCDEABCDEABCDEABCDE (enter 25 characters)
Output: ABCDEABCDEABCDEABCD (receives 19 characters + 1 "")

Usage 3:cin.get (no parameters) No parameters are used primarily to discard unwanted characters in the input stream, or to discard the carriage return, making up for the insufficiency of Cin.get (character array name, number of received characters) (because Cin.get () retains the newline character in the input buffer and can use Cin.get () To discard line breaks)

3, Cin.getline ()//accept a string, you can receive spaces and output

#include <iostream>
using namespace Std;
Main ()
{
Char m[20];
Cin.getline (m,5);
cout<<m<<endl;
}

Input: JKLJKLJKL
Output: JKLJ

Accept 5 characters to M, where the last one is ' I ', so see only 4 characters output;

If you change 5 to 20:
Input: JKLJKLJKL
Output: JKLJKLJKL

Input: JKLF FJLSJF FJSDKLF
Output: JKLF fjlsjf FJSDKLF

Extended:
Cin.getline () actually has three parameters, Cin.getline (accepts the string's storage space m, accepts the number 5, the ending character)
When the third argument is omitted, the system defaults to ' \ n '
If the example Cin.getline () is changed to Cin.getline (m,5, ' \ n '), when the input JLKJKLJKL output JKLJ, input jkaljkljkl, output JK, The status flag for CIN is at this point false (as long as the number of entries is more than the accepted number is considered not to be the correct ending, if you then use the Getline () function, you need cin.clear ())

When used in a multidimensional array, you can also use the Cin.getline (m[i],20) Usage:

#include <iostream>
#include <string>
using namespace Std;

Main ()
{
Char m[3][20];
for (int i=0;i<3;i++)
{
cout<< "\ n Please enter the" <<i+1<< "string:" <<endl;
Cin.getline (m[i],20);
}

cout<<endl;
for (int j=0;j<3;j++)
cout<< "Output m[" <<j<<] Value: "<<m[j]<<endl;

}

Please enter a 1th string:
Kskr1

Please enter a 2nd string:
Kskr2

Please enter a 3rd string:
Kskr3

Value of output M[0]: KSKR1
Value of output M[1]: KSKR2
Value of output M[2]: KSKR3

4, Getline ()//accept a string, can receive space and output, need to include "#include <string>"

#include <iostream>
#include <string>
using namespace Std;
Main ()
{
String str;
Getline (CIN,STR);
cout<<str<<endl;
}

Input: JKLJKLJKL
Output: JKLJKLJKL

Input: JKL JFKSLDFJ JKLSJFL
Output: JKL jfksldfj JKLSJFL

Similar to Cin.getline (), but Cin.getline () belongs to the IStream stream, and Getline () is a string stream and is a different two function