C++ Tutorials

C++ Tutorials

This is a comment right over in c++ calling library of program setw manipulator work with IOMANIP Library Main body of program always placed in braces Initializing variables here c out is used to show the output on-screen set width, chek in descriptin Output of the program.

The C++ function std::setw behaves as if member width were called with n as an argument on the stream on which it is inserted/extracted as a manipulator. setw() method of iomaip library in C++ is used to set the ios library field width based on the width specified as the parameter to this method. std::setw. /*undefined*/ setw (int n);. Set field width. Sets the field width to be used on output operations. It is used to sets the field width to be used on output operations.

Setw and setfill in c++

Setwsetfill
SETfill description:-
The C++ function std::setfill behaves as if member fill were called with c as an argument on the stream on which it is inserted as a manipulator (it can be inserted on output streams).
SETW Description:-
The C++ function std::setw behaves as if member width were called with n as argument on the stream on which it is inserted/extracted as a manipulator (it can be inserted/extracted on input streams or output streams).
Declaration
Following is the declaration for std::setw function.
setw (int n); 
Declaration
Following is the declaration for std::setfill function.
setfill (char_type c); 
Basic guarantee − if an exception is thrown, the stream is in a valid state.Basic guarantee − if an exception is thrown, the stream is in a valid state.
Syntax :
std::setw (int n); where n is a number of characters to be used as the field width.
Syntax :
std::setfill (char_type c); char_type is the type of characters used by the stream (i.e., its first class template parameter, charT).
Example:-
#include <iostream> 
#include <iomanip> 
 
int main () { 
std::cout << std::setw(10); 
std::cout << 88 << std::endl; 
return 0; 
Example:-
#include <iostream> 
#include <iomanip> 
 
int main () { 
std::cout << std::setfill (‘x’) << std::setw (10); 
std::cout << 88 << std::endl; 
return 0; 

Setw c++ left

std::left

ios_base& left (ios_base& str);

Adjust output to the leftSets the adjustfield format flag for the str stream to left.

When adjustfield is set to left, the output is padded to the field width (width) by inserting fill characters (fill) at the end, effectively adjusting the field to the left.

“you can left justify text output using the manipulator setiosflags(ios::left)”

I didn’t understand that. but the cout << left << setw(x) << command it so much easier!!

Setw c++ adalah

std::setw

/*undefined*/ setw (int n);

Set field widthSets the field width to be used on output operations.

Behaves as if member width were called with n as an argument on the stream on which it is inserted/extracted as a manipulator (it can be inserted/extracted on input streams or output streams).

This manipulator is declared in header <iomanip>.

Example

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// Setw example #include <iostream> // std::cout, std::endl #include <iomanip> // std::setw int main () { std::cout << std::setw(10); std::cout << 77 << std::endl; return 0; }
Output:
77

Setw c++ not working

To achieve what you have in mind you should experiment with a bigger value since your string is longer than 21 characters, Example:

cout << setfill('*') << setw(80) << "*" << endl;
cout  << setfill(' ') << setw(56) <<  "Hello World" << endl;
cout << setfill('*') << setw(80) << "*" << endl;

Output:

********************************************************************************
                  Hello World
********************************************************************************

Setprecision c++

C++ manipulator setprecision function is used to control the number of digits of an output stream display of a floating- point value.

How do you include Setprecision in C++?

std::setprecision

Replace These Headers

#include <iomanip.h>
#include <iomanip>

With These.

#include <iostream>
#include <iomanip>
using namespace std;

In this tutorial we will learn about set in C++. Sets are a type of associative containers in which each element has to be unique, because the value of the element identifies it.

The value of the element cannot be modified once it is added to the set, though it is possible to remove and add the modified value of that element. The values always remain in a sorted order. To insert a value into a set, we use the insert function. If that value already exists in the set, it won’t be added.

If it doesn’t exist, it will be inserted and the container will be sorted. Here, I am inserting a few elements into a set and printing the set using iterators. Just like vectors, we can get the first and the last iterator using begin and end function.

Let’s run this code, we can see that all the elements are unique and sorted. We can use the size, max_size, empty functions like we do in vectors. Like this.

Let’s run this code, we can see that the output is as expected. We can remove elements from the set using erase function. There are two ways of doing so, first by directly passing the value to be deleted. Like, here I am deleting 100.

We can also delete elements by passing its iterator. Like, here, I am deleting all elements from beginning till 30. Let’s run this code, we can see that first 100 is deleted, then all the values less than 30 are deleted.

To clear the entire set, we can use the clear function. Let’s run this code, we can see that the size of set is 0 now.

To create a set that stores values in reversed, we can do it like this, now the set will work in the similar fashion just the only difference being the values will be stored in a reverse order. Let’s run this code, we can see that the set is reversed sorted.