setprecision (n) : when used in conjunction with fixed, set the number of digits afterthe decimal point to n. Without fixed, the setprecision (n) will output n significantdigits instead.showpoint: when printing a floating-point number, display the decimal point even if thevalue is exactly equal to a whole number.For setw (), setprecision (), showpoint, see example below:float cost = 10.0;cout << ":" << cost << ":" << endl;cout << fixed << setprecision (2) << showpoint;cout << right << ":" << setw(8) << cost << ":" << endl;cout << ":" << setw (8) << "1234567" << ":" << endl;The output would be as follows::10:10.00:: 1234567: PageThe text output of a program should be well-formatted for readability as well as displayingnumbers with the proper notation and precision levels. The default output formatting in C++ isoften not desirable, so one can add explicit instructions to the cout stream. These manipulatorsand functions are defined in the library.• setw (n): set the width (number of characters) of the next item to be at least n.• If the next item width is less than n, then pad the item with extra spaces.• If the next item width is greater than n, then the entire next item is output.• left and right: when used in conjunction with setw (); justify the item to one sideforcing the padding to the other side. Note that these manipulators are persistent, i.e. remainseffective until the next change occurs.• fixed: use the fixed-point notation (the decimal point notation that we are familiar with)when displaying a numerical item. Note that fixed defaults to 6 decimal points if the datatype is float or double. See the example below:int i = 123;float f = 12.3;float ff = 0.0001234;double d = 10;double dd = 20.1234567890;cout << fixed;cout << i << endl;cout << f << endl;Note therounding// output: 123// output: 12.300000// output: 0.000123// output: 10.000000// output: 20.123457-cout << ff < endl;cout << d << endl;Note thecout << dd << endl;rounding

Below is the code and sample output:

setprecision (n) : when used in conjunction with fixed, set the number of digits after the decimal point to n. Without fixed, the setprecision (n) will output n significant digits instead. showpoint: when printing a floating-point number, display the decimal point even if the value is exactly equal to a whole number. For setw (), setprecision (), showpoint, see example below: float cost cout << ":" << cost << ":" << endl; cout << fixed << setprecision (2) << showpoint; cout << right << ":" < setw(8) << cost << ":" << endl; cout << ":" << setw(8) << "1234567" << ":" << endl; = 10.0; The output would be as follows: :10: 10.00: : 1234567:

setprecision (n) : when used in conjunction with fixed, set the number of digits after the decimal point to n. Without fixed, the setprecision (n) will output n significant digits instead. showpoint: when printing a floating-point number, display the decimal point even if the value is exactly equal to a whole number. For setw (), setprecision (), showpoint, see example below: float cost cout << ":" << cost << ":" << endl; cout << fixed << setprecision (2) << showpoint; cout << right << ":" < setw(8) << cost << ":" << endl; cout << ":" << setw(8) << "1234567" << ":" << endl; = 10.0; The output would be as follows: :10: 10.00: : 1234567:

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

setprecision (n) : when used in conjunction with fixed, set the number of digits after
the decimal point to n. Without fixed, the setprecision (n) will output n significant
digits instead.
showpoint: when printing a floating-point number, display the decimal point even if the
value is exactly equal to a whole number.
For setw (), setprecision (), showpoint, see example below:
float cost = 10.0;
cout << ":" << cost << ":" << endl;
cout << fixed << setprecision (2) << showpoint;
cout << right << ":" << setw(8) << cost << ":" << endl;
cout << ":" << setw (8) << "1234567" << ":" << endl;
The output would be as follows:
:10:
10.00:
: 1234567:

Page
The text output of a program should be well-formatted for readability as well as displaying
numbers with the proper notation and precision levels. The default output formatting in C++ is
often not desirable, so one can add explicit instructions to the cout stream. These manipulators
and functions are defined in the <iomanip> library.
• setw (n): set the width (number of characters) of the next item to be at least n.
• If the next item width is less than n, then pad the item with extra spaces.
• If the next item width is greater than n, then the entire next item is output.
• left and right: when used in conjunction with setw (); justify the item to one side
forcing the padding to the other side. Note that these manipulators are persistent, i.e. remains
effective until the next change occurs.
• fixed: use the fixed-point notation (the decimal point notation that we are familiar with)
when displaying a numerical item. Note that fixed defaults to 6 decimal points if the data
type is float or double. See the example below:
int i = 123;
float f = 12.3;
float ff = 0.0001234;
double d = 10;
double dd = 20.1234567890;
cout << fixed;
cout << i << endl;
cout << f << endl;
Note the
rounding
// output: 123
// output: 12.300000
// output: 0.000123
// output: 10.000000
// output: 20.123457-
cout << ff < endl;
cout << d << endl;
Note the
cout << dd << endl;
rounding

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