Cin. Get (), Cin. Getline (), Getline (), gets (), getchar ()

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1. Cin. Get ()

 

(1). Cin. Get () extract a single character. You can extract carriage return and space.

A = cin. Get ();

 

(2) Same as (1)

Cin. Get ();

 

(3 ).

Cin. Get (character array, number of characters N, Terminator character); // Terminator character can be left blank, default: '\ N'

Or cin. Get (character pointer, number of characters N, Terminator character); // The Terminator character can be left blank. The default value is '\ n'

 

The termination symbol cannot be skipped. You need to extract the carriage return '\ N'

Can be written

Cin. Get (A, 20 );

Cin. Get ();

You can also write them in combination.

Cin. Get (A, 20). Get ();

 

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2. Cin. Getline ()

Cin. Getline (character array/character pointer, number of characters N, Terminator character); // Terminator character can be left blank, default: '\ N'

 

You can skip the termination symbol.

That is, the line break generated by the Enter key is discarded when a whole row is read each time.

 

 

Returned value: this is to be studied.

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3. Getline ()

Getline () // receives a string, receives spaces, and outputs the string, and must contain "# include <string>"

 

 

# Include <iostream>

# Include <string>

Using namespace STD;

Void main (void)

{

Stringa;

Getline (CIN, );

Cout <A <Endl;

}

 

In the above Code, if you enter a B c, You need to press the Enter key twice to display a B c (in vc6), because Getline has three parameters, the third parameter is the string Terminator, that is, when Getline encounters this Terminator, it does not accept input, for example, Getline (CIN, St,'s '); even if the input is abcsabc, only ABC is displayed. Therefore, in the above case, some people say that Getline uses the carriage return ('\ n') as the terminator by default, press enter for the first time to end the string, and press enter for the second time to start output.

 

 

 

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4. Gets ()

Gets () // receives a string, receives spaces, and outputs the string, and must contain "# include <string>"

 

Returned value: gets (STR) returns STR when the read is successful. Str stores the successfully read content.

Returns NULL if the request fails, and the STR content remains unchanged.

 

# Include <iostream>

# Include <string>

Using namespace STD;

Int main ()

{

Chara [20];

Gets (a); // cannot be written as a = gets ();

Cout <A <Endl;

Return0;

}

 

Input: ABC

Output: ABC

 

Input: A B C

Output: A B C

 

Similar to an example in CIN. Getline (), gets () can also be used in multi-dimensional arrays:

 

# Include <iostream>

# Include <string>

Using namespace STD;

Int main ()

{

Chara [3] [20];

For (INTI = 0; I <3; I ++)

Gets (A [I]);

Cout <"--------" <Endl;

For (intj = 0; j <3; j ++)

Cout <A [J] <Endl;

Return0;

}

 

Input:

A B 1

A B 2

A B 3

Output:

A B 1

A B 2

A B 3

 

The usage of gets () and CIN. Getline () is similar, except that CIN. Getline () has one more parameter;

 

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5. getchar ()

Getchar () // accepts one character and must contain "# include <string>"

 

# Include <iostream>

# Include <string>

Using namespace STD;

Int main ()

{

Chara;

A = getchar ();

Cout <A <Endl;

Return0;

}

 

Input: ABC

Output: