Programming Language: Golang

Namespace/Package Name: math/big

Class/Type: Int

Method/Function: String

Examples at hotexamples.com: 30

The Go programming language has a math/big package that provides arbitrary-precision integer arithmetic. It is used when dealing with numbers that are too large to be represented by the primitive data types such as int or uint.

The package provides several functions to perform basic arithmetic operations such as addition, subtraction, multiplication, and division, as well as more complex operations such as calculating modular inverses and prime factorization.

Here are some code examples using the math/big package:

1. Converting a string to a big Int

In this example, we create a new big Int variable and initialize it with the value of the string "12345678901234567890". The second argument to the SetString function specifies the base of the string representation of the number, which in this case is decimal.

2. Adding two big Ints

This example shows how to add two big Ints together using the Add function from the math/big package. We create two big Int variables and initialize them with the values of the numbers we want to add. We then create a third big Int variable and use the Add function to add the first two variables together and set the result to the third variable.

3. Computing the GCD of two big Ints

The package provides several functions to perform basic arithmetic operations such as addition, subtraction, multiplication, and division, as well as more complex operations such as calculating modular inverses and prime factorization.

Here are some code examples using the math/big package:

1. Converting a string to a big Int

import "math/big" numStr := "12345678901234567890" num := new(big.Int) num, _ = num.SetString(numStr, 10)

In this example, we create a new big Int variable and initialize it with the value of the string "12345678901234567890". The second argument to the SetString function specifies the base of the string representation of the number, which in this case is decimal.

2. Adding two big Ints

import "math/big" a := big.NewInt(12345678901234567890) b := big.NewInt(98765432109876543210) c := big.NewInt(0) c.Add(a, b)

This example shows how to add two big Ints together using the Add function from the math/big package. We create two big Int variables and initialize them with the values of the numbers we want to add. We then create a third big Int variable and use the Add function to add the first two variables together and set the result to the third variable.

3. Computing the GCD of two big Ints

import "math/big" a := big.NewInt(12345678901234567890) b := big.NewInt(98765432109876543210) gcd := big.NewInt(0) gcd.GCD(nil, nil, a, b)This example demonstrates how to compute the greatest common divisor (GCD) of two big Ints using the GCD function from the math/big package. We create two big Int variables and initialize them with the values of the numbers we want to compute the GCD for. We then create a third big Int variable and use the GCD function to compute the GCD of the first two variables and set the result to the third variable. The first two arguments to the GCD function in this case are nil, indicating that we want the function to use the default GCD algorithm. In conclusion, the math/big package is a powerful tool for dealing with large numbers in Go. Its functions and methods are versatile and can be used in various applications that involve integer arithmetic.

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