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StringStream in C++ for Decimal to Hexadecimal and Hexadecimal to Decimal

In this article, you will learn about the StringStream in C++ for Decimal to Hexadecimal and Hexadecimal to Decimal. But before discussing its implementation, you must know about the stringStream in C++.

What is the stringstream in C++?

A strong feature in C++ called StringStream enables smooth conversion between various data types and string representations. StringStream makes handling conversions like Decimal to Hexadecimal and vice versa easier by offering an effective method of managing data types without requiring complex coding.

Std::stringstream is a flexible tool for treating strings like input/output streams in C++. It is a component of the <sstream> header in the Standard Template Library (STL). Similar to input/output streams for files or consoles, it offers functionality to carry out operations like input, output, and formatting on strings (std::cin, std::cout, std::ifstream, etc.).

Standard Functions at a Glance: stringstream

The idea of a stream that can read from and write to a string serves as the foundation for std::stringstream. Similar to normal I/O streams, it lets users convert between string data and other types (such as characters, numeric types, etc.) with ease by using stream operators \\ (insertion) and >> (extraction).

An Overview of Hexadecimal to Decimal Transformation:

  • Two alternative numbering systems that are frequently used in programming are decimal and hexadecimal.
  • Hexadecimal uses base 16 (0-9 and A-F), while decimal uses base 10 (0-9).
  • A decimal number is converted to hexadecimal by continually dividing it by 16 and recording the remainders at each stage. The Hexadecimal representation is created by converting the remainder to their corresponding Hexadecimal values and placing them in reverse order.

Converting Decimal to Hexadecimal with stringstream:

StringStream in C++ can effectively handle the necessary string manipulation, making the conversion procedure from decimal to hexadecimal simpler.


Let's take an example to illustrate the conversion from Decimal to hexadecimal with stringstream:


StringStream in C++ for Decimal to Hexadecimal and Hexadecimal to Decimal

The above code utilizes the DecimalToHexadecimal function to convert a decimal number to its hexadecimal equivalent using std::hex and std::stringstream. The main() function prints the Hexadecimal value that is obtained as a string.


Function DecimalToHexadecimal:

  • An integer decimalNumber is the input for the DecimalToHexadecimal
  • It makes use of a std::stringstream object (ss) to manipulate and convert strings.
  • ss \\ std::hex \\ decimalNumber; is used to apply the std::hex manipulator to the stringstream. By doing this, the stringstream is configured to interpret any more integer input as hexadecimal.
  • Using str(), the function retrieves the contents of the stringstream and outputs a string in return. The supplied decimal number's hexadecimal representation is contained in this string.


Let's take an example to illustrate the conversion from Hexadecimal to Decimal with stringstream:


StringStream in C++ for Decimal to Hexadecimal and Hexadecimal to Decimal

This code snippet's HexadecimalToDecimal method converts a Hexadecimal string to its corresponding Decimal integer by using std::stringstream and std::hex. After that, the main() method displays and returns the Decimal value.


  • const std::string &hexadecimal; int HexadecimalToDecimal
  • This function accepts as input a string in a hexadecimal representation of a hexadecimal number and outputs an integer, which is the corresponding representation in decimal notation.
  • std::stringstream ss;: It initializes an object called ss in the std::stringstream that will be used to manipulate and convert strings.
  • ss \\ hexadecimal: std::hex \\: The \\ operator is used to insert the input hexadecimal string into the stringstream ss. Use the std::hex manipulator to tell the stringstream to interpret the incoming string as a hexadecimal number.
  • int decimalNumber; ss >> decimalNumber;: The stringstream ss converts the hexadecimal string to a hexadecimal number and then reads the information as an integer. This value is extracted and stored in the decimalNumber variable.
  • return decimalNumber;: The function returns a decimal number containing the hexadecimal string's equivalent in decimal notation.


StringStream makes converting between Decimal and Hexadecimal representations easier because it manages string manipulations effectively. It provides a sophisticated answer, doing away with the necessity for laborious human computations. Programmers can easily convert between Decimal and Hexadecimal and Hexadecimal and Decimal by using StringStream's features, which improves the readability and maintainability of code.

Comprehending the use of StringStream in these conversions not only simplifies the code but also demonstrates how C++ can easily handle various data types.

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