Как double преобразовать в string
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Java – Convert double to string example
In this java tutorial, we will learn how to convert double to string in Java. There are several ways we can do this conversion –
1. Java – Convert double to string using String.valueOf(double) method.
2. Convert double to string in Java using toString() method of Double wrapper class.
3. Java – double to string conversion using String.format() method
4. Convert double to string using DecimalFormat.format()
5. Java Convert double to string using StringBuffer and StringBuilder.
1. Java – Convert double to string using String.valueOf(double) method
public static String valueOf(double d) : We can convert the double primitive to String by calling valueOf() method of String class. This method returns the string representation of the double argument.
Output:
2. Convert double to string in Java using toString() method of Double wrapper class
public String toString( ) : This is the another method that can be used to convert double to String. This method returns a string representation of the Double object. The primitive double value represented by this object is converted to a string.
Output:
3. Java – double to string conversion using String.format() method
String.format() method can be used for the double to string conversion.
Output:
We can adjust the number of decimal digits in our string using this method. For example: If we want only two digits after decimal point in our string then we can change the code like this:
The output of this code would be: My String is: -100.00
This is because this method round of the double value.
4. Convert double to string using DecimalFormat.format()
Similar to String.format() method. To use this, we have to import the package: java.text.DecimalFormat in our code.
Output:
5. Java Convert double to string using StringBuffer and StringBuilder
We can convert double to string using StringBuffer and StringBuilder as well. The steps of conversion are same for both. The steps are as follows –
1. Create StringBuffer/StringBuilder instance
2. Append double value
3. Convert StringBuffer/StringBuilder to String
double ->StringBuffer ->String
double ->StringBuilder ->String
Output:
C++ : Convert double to string and manage precision | scientific notation
In this article we will discuss different ways to convert double to String or char array with or without precision i.e.
double to String using C++11’s std::to_string
std::to_string is introduced in c++11.
Example to convert double to std::string using to_string is as follows,
Output:
It has default precision of 6 digits and we cannot change it. If you want customised precision then you should use stringstream.
double to String using ostringstream
Header file Required
Example to convert double to std::string using ostringstream is as follows,
For Big Numbers ostringstream will automatically convert it to scientific notation.
double to String with scientific notation using ostringstream
Add std::fixed to stream i.e.
It will force the ostringstream to convert double using fixed-point notation instead of scientific one. For example,
Output
By default, precision is up to max 6 in stringstream’s double to string conversion.
double to String with Custom Precision using ostringstream
Header file Required
To convert Double to String with Custom Precision set precision in stringstream i.e.
Let’s set precision to 2 i.e.
Output:
double to String / Char array using C’s snprintf
Output
double to String boost’s lexical_cast
Header file Required
Example,
Output
Complete example is as follows,
Output:
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