C++ Tutorial Index

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C++ Exception Handling

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Cpp_int in c++

An integer with arbitrary precision that is often built using libraries like Boosting is referred to in C++ as cpp_int. It is useful for jobs involving very big numbers, encryption, scientific computing, and other areas where normal integer types fall short owing to their defined size and accuracy limits. It enables you to work with numbers of infinite size and precision. cpp_int handles arbitrary precision automatically, simplifying difficult calculations and ensuring correct results.

Introduction to Arbitrary-Precision Integers:

Traditional C++ programming uses fixed-size classes like int, long, and long to represent integers. These types can only carry integers that are a specific size and precision due to predefined range restrictions. For instance, an int can store values between -2 billion and +2 billion, as it typically has 32 bits on all platforms. Arithmetic operations may overflow or underflow outside of this range, producing unintended consequences.

These restrictions on integer size or precision can be a substantial barrier in numerous practical uses, particularly those requiring mathematics, encryption, computational science, and large-scale data processing. In this situation, arbitrary-precision integers are useful.

What is ''cpp_int''?

There is no built-in type for cpp_int in C++. It is actually only a naming convention for an arbitrary-precision number, which can often be implemented with the aid of packages like Boost. Multiprecision. These libraries enable precise computations and the handling of extremely big or small numbers without having to worry about overflows as well as underflows. The only limitation is how much memory can be used.

Implementing Arbitrary-Precision Integers with Boost.Multiprecision:

Boost. A common C++ library called Multiprecision provides a cpp_int category for arbitrary-precision numeric arithmetic. You must connect your project to the Boost library and include the necessary headers in order to use cpp_int.

Here is a step-by-step tutorial on using Boost to interact with cpp_int.Multiprecision:

1. Include Necessary Headers:

#include <boost/multi-precision/cpp_int.hpp>

#include <iostream>

Accessibility to the cpp_int class and associated functionality is made possible by these headers.

2. Declare '''cpp_int''' Variables:

namespace mp = boost::multiprecision;

mp::cpp_int a = 1234567890;

mp::cpp_int b = "9876543210123456789012345678901234567890";

Similar to conventional integers, cpp_int variables can be declared and initialized with strings that represent the integer (helpful for very large values) or by assigning a value directly.

3. Perform Arithmetic Operations:

mp::cpp_int sum = a + b;

mp::cpp_int product = a * b;

With cpp_int variables, you may do common arithmetic operations like multiplication, division, addition, and subtraction. The library handles the difficulties of managing variable precision.

4. Output the Results:

std::cout << "Sum: " << sum << std::endl;

std::cout << "Product: " << product << std::endl;

Finally, you may display the results of your computations using the standard output stream.

Why Use ''cpp_int'' and Arbitrary-Precision Integers?

After learning how to use cpp_int, let's investigate the different situations in which arbitrary-precision integers come in handy:

1. Cryptography: Many times, enormous integers, such as keys or prime numbers, are used in cryptographic techniques. Security depends on making sure that these computations are accurate. For secure decryption and encryption to work, arbitrary-precision integers are necessary.

2. Number Theory: Mathematicians research the characteristics of integers in the area of number theory. Working with unknown or incredibly huge numbers is frequently necessary for tasks including prime factorization, modular math, and solving Diophantine equations. cpp_int makes these difficult tasks simpler.

3. Scientific Computing: Numerous scientific experiments and simulations call for extremely accurate numerical calculations. For instance, cpp_int aids in maintaining the correctness of results while modelling physical systems or running simulations in areas like astronomy or quantum mechanics.

4. Financial Calculations: Accurate depiction of enormous numbers is vital to prevent financial disparities, as financial applications typically deal with enormous amounts of data, particularly when managing exchange rates for currencies, interest computations, or risk assessments.

5. Big Data Processing: Integers of different sizes may be used in enormous databases while processing and analyzing data. Aggregations, statistical analysis, and graph algorithms can all be performed using arbitrary-precision integers to meet their various requirements.

6. Competitive Programming: In situations involving numbers with uncertain or extreme values, players frequently run into issues in programming contests and algorithmic competitions. Instead of worrying about integer overflow problems, they may concentrate on finding a solution thanks to cpp_int.

7. Handling Large Numbers: You can work with integers that are almost infinitely large with cpp_int. This is essential for applications like encryption, number theory, or astronomical simulations where integers might grow to extraordinarily enormous sizes.

Common Operations with cpp_int:

Similar to the C++ standard integer types, cpp_int offers a large variety of operations. Here is a quick rundown of typical operations:

Arithmetic Operations:

mp::cpp_int a = 123;

mp::cpp_int b = 456;

mp::cpp_int sum = a + b;

mp::cpp_int diff = a - b;

mp::cpp_int product = a * b;

mp::cpp_int quotient = a / b;

Like conventional integers, cpp_int supports multiplication, division, addition, and subtraction. The complexity of arbitrary precision is taken care of for you by the library.

Comparison Operations:

bool isEqual = (a == b);

bool isNotEqual = (a != b);

bool isgreaterthan = (a > b);

bool isLessThan = (a < b);

Standard comparison operators can be used to compare cpp_int values and verify for equal rights, inequality, and order.

Input and Output:

mp::cpp_int num;

std::cin >> num;

std::cout << num;

Similar to built-in types, cpp_int entities are able to read from and give to standard input as well as output streams.

Conversion to Other Types:

int integerPart = static_cast<int>(num);

double doubleValue = static_cast<double>(num);

When necessary, you may convert cpp_int to another numeric type.

Advanced Features of Boost.Multiprecision:

Boost. Advanced capabilities offered by multi-precision allow for greater customization of cpp_int's behaviour:

1. Precision Control: The total amount of bits utilized to convey a cpp_int variable is up to you. You can use this to optimize memory utilization and functionality for your particular application.

2. Custom Allocators: To control how the recollection used by cpp_int is allocated, the library lets you specify unique allocators. This can be useful for optimizing memory allocation in the circumstances with limited resources.

3. Modular Arithmetic: Boost. Modular operations in arithmetic, which are crucial in cryptography and some mathematical computations, are supported by multi precision.

4. User-Defined Types: Using the template-based design of the library, you can construct your number types with particular features like fixed size or unique behaviors.

Advantages of cpp_int:

1. Precision and Flexibility: Utilising "cpp_int" has the main benefit of being able to handle integers of any size. When working on high-precision simulations, encryption, or mathematical algorithms, "cpp_int" enables you to work with values that exceed normal integer types.

2. Portability: "cpp_int" provides a high level of portability due to the fact that it is a component of the Boosting C++ Libraries. Without having to worry about platform or compiler compatibility, you can utilize it in any C++ project.

3. Ease of Use: For computations and comparisons, "cpp_int" has a recognizable interface, making it very simple to use, particularly if you have become familiar with C++.

Example Use Cases:


"cpp_int" is a crucial tool for securely developing cryptography methods because huge integers with primes and modular arithmetic are frequently used in these techniques.

cpp_int p = generate_large_prime();

cpp_int q = generate_large_prime();

cpp_int n = p * q;

Scientific Computing:

You can come into calculations in scientific computing that need to be extremely precise, like computer simulations or symbol mathematics. To represent and work with constants or the outcomes of such computations, use "cpp_int".

cpp_int gravitationalConstant = 6.67430e-11_cpp;

cpp_int pi = 3.14159265358979323846264338327950288419716939937510_cpp;

Number Theory:

Finding prime factors, computing Fibonacci numbers, and solving Diophantine equations are just a few number theory topics that frequently entail working with very big integers.

cpp_int largeFibonacci = fibonacci(1000);

cpp_int commonDivisor = gcd(1234567890123456789, 9876543210987654321);

Performance Considerations:

Although "cpp_int" allows for arbitrary-precision arithmetic, it is necessary to keep in mind that computations on large integers can sometimes be slower than those on built-in types because of the additional memory management and calculation required. Dealing with "cpp_int" in efficiency-critical programs, therefore, requires careful consideration of the performance consequences.


In conclusion, the C++ function "cpp_int" offers a flexible and strong tool for handling infinitely huge integers. It is a key element of the Boosting Multiprecision Libraries, giving C++ programmers precision, adaptability, and portability. Developers may solve difficult problems involving enormous numbers with "cpp_int," making it a useful tool in industries like encryption, computational science, and number theory. While utilizing "cpp_int" in speed-critical applications has several benefits, such as compatibility and convenience of use, it's important to take performance effects into account. Overall, "cpp_int" gives C++ programmers the ability to work with huge integers without difficulty, creating new opportunities for a variety of applications.