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getline c, get c, put c and write c
getline c, get c, put c and write c - Unformatted stream I/O functions
- getline c, get c, put c and write c - These functions are called unformatted stream IO functions where
- get() and put() can handle single character input and output and
- getline() and write() can handle multi character input and output.
- Header files for these above functions : "iostream.h"
Single character functions : get() and put()
Single Character functions are used for reading and displaying a single character respectively. These functions are :
- get() :
- put() :
- The function put() is an output function and is used to output a character at a time.
- The put() function is also a member of ostream class and is involved with an ostream object cout.
Example of get() and put() :
- The above code keeps on accepting and displaying characters until a new line character (typed by pressing enter key) is encountered.
- The difference between cin>>ch and cin.get(ch) is that when >> operator is used, the white spaces (e.g. tabs) and newline characters are ignored where as it is not so with cin.get(ch).
- The above code first input a character in variable ch and prints it on the screen as given by cout.put(ch).
- The line cout.put(65) will display 'A' on the screen as ASCII value of A is 65.
- Thus, a number argument can also be given with put() and it will print equivalent character of that number.
Multi Character Functions : getline() and write()
The single character functions defined above can handle single character at a time and cannot handle multiple characters. To solve this problem, there are functions that can handle strings also. These functions are :
- getline() -
- The getline() is an input function and needs a line of text that ends with a newline character.
- This function is used as shown below :
- where line specifies the name of the variable that will store the line of text, and
- size specifies that maximum size-1 characters can be stored in line;
- 1 extra character in size is reserved for null character ' '.
- write() -
- The function write() is an output function and can display an entire line.
- It takes the following form :
- where line specifies the string variable whose contents are to be displayed, and
- size specifies the number of characters to be displayes.
Example of getline() and write() :
- The above code reads a line of text (max 29 valid characters) and stores it under variable name.
- The function getline() can read white spaces (spaces, tabs etc.) and newline characters whereas cin>>name will not read any white space or newline character.
- For instance if you give following input : "Test Program" then
- with getline() function, name will be having value "Test Program" but
- when used with >>, name will be having Test only as any other character following a white space or newline character is ignored by >>.
- After reading a string, cin automatically adds the terminator character ' ' to the string.
Post date: 2016-01-03 13:29:14
Post date GMT: 2016-01-03 13:29:14
Post modified date: 2016-01-05 11:02:57
Post modified date GMT: 2016-01-05 11:02:57
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