iomanip setw() function in C++ with Examples

The setw() method of iomanip library in C++ is used to set the ios library field width based on the width specified as the parameter to this method.

Syntax:

setw(int n)

Parameters: This method accepts n as a parameter which is the integer argument corresponding to which the field width is to be set.
Return Value: This method does not returns anything. It only acts as stream manipulators.

Example 1:

C++

// C++ code to demonstrate
// the working of setw() function

#include <iomanip>
#include <ios>
#include <iostream>

using namespace std;

int main()
{

    // Initializing the integer
    int num = 50;

    cout << "Before setting the width: \n"
         << num << endl;

    // Using setw()
    cout << "Setting the width"
         << " using setw to 5: \n"
         << setw(5);

    cout << num << endl;

    return 0;
}

Output:

Before setting the width: 
50
Setting the width using setw to 5: 
   50

Example 2:

C++

// C++ code to demonstrate
// the working of setw() function

#include <iomanip>
#include <ios>
#include <iostream>

using namespace std;

int main()
{

    // Initializing the integer
    int num = 50;

    cout << "Before setting the width: \n"
         << num << endl;

    // Using setw()
    cout << "Setting the width"
         << " using setw to 10: \n"
         << setw(10);

    cout << num << endl;

    return 0;
}

Output:

Before setting the width: 
50
Setting the width using setw to 10: 
        50

Reference: http://www.cplusplus.com/reference/iomanip/setw/