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ios manipulators hex() function in C++

Last Updated : 02 Sep, 2019
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The hex() method of stream manipulators in C++ is used to set the baseline format flag for the specified str stream. This flag sets the baseline for HexaDecimal numbers. Hence the output shows the number in HexaDecimal base. Syntax: 
ios_base& hex (ios_base& str)
Parameters: This method accepts str as a parameter which is the stream for which the format flag is affected. Return Value: This method returns the stream str with internal format flag set. Example 1: CPP 
// C++ code to demonstrate
// the working of hex() function

#include <iostream>

using namespace std;

int main()
{

    // Initializing the number
    int n = 321;

    // Using hex()
    cout << "hex flag: "
         << hex << n << endl;

    return 0;
}
Output: 
hex flag: 141
Example 2: CPP 
// C++ code to demonstrate
// the working of hex() function

#include <iostream>

using namespace std;

int main()
{

    // Initializing the number
    int n = -321;

    // Using hex()
    cout << "hex flag: "
         << hex << n << endl;

    return 0;
}
Output: 
hex flag: fffffebf
Reference: http://www.cplusplus.com/reference/ios/hex/

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