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In C++ the function stoi ()
is used to convert data from a string type to an integer type, or int. If you are using C++ 03 or earlier, the stringstream
class is used to convert the string to int.
In C++, data types are used to distinguish particular data types. For example, strings are used to store text, Booleans are used to store true / false values, and integers are used to store integers (numbers that do not have a decimal point).
When writing code in C++, there are situations where you need to convert values ​​between different types. For example, you might want to convert a string to an integer so that you can perform mathematical operations on the value.
This tutorial will explain, referring to examples, how to convert a string to an integer in C++. We are going to discuss two approaches that you can use for an integer string conversion operation that, combined, covers all versions of C++.
C++ Data Types
There are a number of data types used in C++ to store data. For example, booleans are used to store true / false values, floats are used to store floating point numbers (decimals), and strings are used to store text data.
The type of data in which a value is stored affects how the value can be manipulated. For example, string operations can be used to manipulate the contents of strings, but they cannot be used with numeric values. So, when working with data, it can be helpful to know how to convert values ​​to a different data type.
String in C++ Int
There are two methods you can use to convert a string to an integer in C++.