Input and Output! Objectives" (and predefined functions)" 1E3! Topic 4! n Learn what a stream is and examine input and output streams!

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1 Input and Output! (and predefined functions)" 1E3! Topic 4! 4 I/O 1 Objectives" n Learn what a stream is and examine input and output streams! n Explore how to read data from the standard input device! n Learn how to write data to the standard output device! n Learn to use predefined functions.! n Discover how to use manipulators in a program to format output 4 I/O 2 1

2 Resources" n This topic is based on Chapter 3 of the textbook.! n You should read Chapter 3 now.! n Skip Putback & Peek; Input Failure; The Clear function; and File Input /Output! n These notes don t cover everything.! 4 I/O 3 What does this pseudocode compute? Input a number-list.! Set x to 0.! FOR EACH number on numberlist! IF number > x! THEN set x to number.! Output x.! A. Sum of numbers B. Max of numbers C. Min of numbers D. None of the above 2

3 n We ve seen! n cin >> n;! Introduction" n Assuming n is declared as an integer, this reads a number from the keyboard and stores it in the variable n.! n cout << The answer is << sum;! n Writes the string in the followed by the value of the variable sum to the screen.! n Here we look more closely at this kind of thing.! 4 I/O 5 Input/Output Streams" n I/O: sequence of bytes (stream of bytes) from source to destination! n Bytes are usually characters, unless program requires other types of information! n Stream: sequence of characters from source to destination! n Input Stream: sequence of characters from an input device to the computer! n Output Stream: sequence of characters from the computer to an output device! 4 I/O 6 3

4 Standard I/O Devices" n Use iostream to extract (receive) data from keyboard and send output to the screen! n iostream contains definitions of two types! n istream - input stream! n ostream - output stream! n iostream has two variables! n cin - stands for common input! n cout - stands for common output! 4 I/O 7 Using cin and cout" n To use cin and cout, the preprocessor directive!#include <iostream> must be used! n The declaration is similar to the following C++ statements:!! istream cin; ostream cout; 4 I/O 8 4

5 cin and the Extraction Operator >>" n The syntax of an input statement using cin and the extraction operator >> is!!!cin >> variable >> variable...; n The extraction operator >> is binary! n The left-hand operand is an input stream variable such as cin n The right-hand operand is a variable of a simple data type! 4 I/O 9 Standard Input" n Every occurrence of >> extracts the next data item from the input stream! n cin >> diam >> price;! n is equivalent to! n cin >> diam; " cin >> price;! n >> skips all whitespace! n Whitespace characters consist of blanks and certain nonprintable characters! 4 I/O 10 5

6 Data Type of Input" n >> distinguishes between character 2 and number 2 by the right hand operand of >> n If it is of type char, the 2 is treated as character 2! n If it is of the type int (or double) the 2 is treated as the number 2 4 I/O 11 Reading Data" n When reading data into a char variable! n Extraction operator >> skips leading whitespace, finds and stores only the next character! n Reading stops after a single character! 4 I/O 12 6

7 Reading Data (Continued)" n To read data into an int or double variable! n Extraction operator >> skips leading whitespace, reads plus or minus sign (if any), reads the digits (including decimal)! n Reading stops on whitespace non-digit character! n Study example 3.1 in the text.! 4 I/O 13 Using Predefined Functions" n A function (subprogram): set of instructions! n When activated, it accomplishes a task! n main executes when a program is run! n Other functions execute only when called! n C++ includes a wealth of functions! n Predefined functions are organized as a collection of libraries called header files! 4 I/O 14 7

8 Predefined Functions" n Header file may contain several functions! n To use a predefined function, you need the name of the appropriate header file! n You also need to know:! n Function name! n Number of parameters required! n Type of each parameter! n What the function is going to do! 4 I/O 15 Predefined Function Example" n To compute x y use pow (power) function.! n pow is in the cmath library! n As are sqrt, sin, cos, log, log10, n pow takes two numeric parameters! n pow returns a number.! n E.g. x = pow(2,3);"!cout << pow (x, 3);! 4 I/O 16 8

9 Use the cmath library Example continued" n The output of the previous program is! 2 to the power of 6 = to the power of 3 = u = 64 The example shows how to call a function, pass parameters to it and use the value that it returns (if it returns one).! 4 I/O 18 9

10 cin and the get Function" n >> can t be used to read blanks or to notice new lines.! n because >> skips blanks and newlines.! n The get function! n Inputs next character (including whitespace)! n Stores character at location indicated by its argument! n The syntax of cin and the get function:! " cin.get(varchar);! 4 I/O 19 Example" n Suppose I want to read two characters, either of which may be a blank, followed by an integer:! cin.get(ch1);! cin.get(ch2);! cin >> num;! n If I type A 34,! n ch1 will be A, ch2 will be and num will be 34.! 4 I/O 20 10

11 Other istream functions" n Note the sections on ignore, putback and peek for future reference.! n These are functions which allow greater control over the input stream.! n For example! n cin.ignore (100,. ); n Skips up to 100 characters until a full stop is read. The. would be discarded too. 4 I/O 21 Input Failure" n Things can go wrong during execution! n If input data does not match the corresponding variables, the program may run into problems! n Trying to read a letter into an int or double variable would result in an input failure! n If an error occurs when reading data! n Input stream enters the fail state! 4 I/O 22 11

12 Input Failure (continued)" n Once in a fail state, all further I/O statements using that stream are ignored! n The program continues to execute with whatever values are stored in variables! n This causes incorrect results! n The clear function restores input stream to a working state!!!istreamvar.clear(); 4 I/O 23 Output" n The syntax of cout and << is:!!cout<< expression or manipulator << expression or manipulator <<...; n Called an output (cout) statement! n The << operator is called the insertion operator or the stream insertion operator! n Expression evaluated and its value is printed at the current cursor position on the screen! 12

13 Output (continued)" n Manipulator: alters output! n endl: the simplest manipulator! n Causes cursor to move to beginning of the next line! n cout << u << endl << name;! n where u=2034 and name is Mary would produce!!2034 Mary! The New Line Character" n Another way of moving to a new line is to include \n in an output string.! n \n is the new line character. n Tells the output to go to the next line! n cout << Line 1\nLine 2\n << name;" n where name is Mary would produce " n Line 1 Line 2 Mary" 13

14 Formatting Output" n As well as the endl manipulator! n setprecision(n) outputs decimal numbers with up to n decimal places! n fixed outputs floating-point numbers in a fixed decimal format! n showpoint forces output to show the decimal point and trailing zeros! 4 I/O 28 14

15 The setw Manipulator" n setw outputs the value of an expression in specific columns! n If the number of columns exceeds the number of columns required by the expression! n Output of the expression is right-justified! n Unused columns to the left are filled with spaces! 4 I/O 29 Types of Manipulators" n Two types of manipulators:! n With parameters! n Without parameters! n Parameterized: require iomanip header! n setprecision, setw, and setfill n Nonparameterized: require iostream header! n endl, fixed, showpoint, left, and flush 4 I/O 30 15

16 I/O and the string Type" n An input stream variable (cin) and extraction operator >> can read a string into a variable of the data type string! n Extraction operator! n Skips any leading whitespace characters and reading stops at a whitespace character! n Can not be used to read strings with blanks! n The function getline n Reads until end of the current line! n Should be used to read strings with blanks! 4 I/O 31 Highlights" q cin and cout are the common input and output streams.! n >> extracts data from an input stream into a variable.! n << pushes data to an output stream! n get and getline allow finer level control! n iomanip library provides manipulators for formatting output.! 4 I/O 32 16

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