Convert String to size_t in C++ Last Updated : 28 Nov, 2022 Comments Improve Suggest changes Like Article Like Report To convert String to size_t in C++ we will use stringstream, It associates a string object with a stream allowing you to read from the string as if it were a stream (like cin). We must include the stream header file in order to use stringstream. When parsing input, the stringstream class comes in quite handy. Syntax: std :: stringstream stream(string_name) Example: C++ // C++ Program to declare a string variable without using stringstream. #include <iostream> using namespace std; int main() { string s1 = "Hello Geek"; cout << s1 << endl; string s2; cin >> s2; cout << s2 << endl; return 0; } Output: Hello Geek GeeksforGeeks Example: C++ // C++ Program to convert the string to size_t using // stringstream. #include <iostream> #include <stream> #include <string> using namespace std; int main() { string str = "246810"; // breaking words stringstream stream(str); // associating a string object with a stream size_t output; // to read something from the stringstream object stream >> output; cout << output << endl; return 0; } Output: 246810 Comment More infoAdvertise with us Next Article Convert String to size_t in C++ A anuragsingh1022 Follow Improve Article Tags : Technical Scripter C++ Technical Scripter 2022 C Conversion Programs Practice Tags : CPP Similar Reads std::string::size() in C++ The std::string::size() function in C++ is a built-in method of the std::string class that is used to determine the number of characters in the string. All characters up to the null character are considered while calculating the size of the string.In this article, we will learn about string::size() 2 min read std::string::resize() in C++ resize() lets you change the number of characters. Here we will describe two syntaxes supported by std::string::resize() in C++ Return Value : None Syntax 1: Resize the number of characters of *this to num. void string ::resize (size_type num) num: New string length, expressed in number of character 3 min read string shrink_to_fit() function in C++ STL The C++ Standard Template Library (STL) provides a variety of useful classes and functions for working with data structures, including the std::string class for manipulating strings. One of the features of the std::string class is the shrink_to_fit() function, which allows developers to reduce the a 3 min read Vector size() in C++ STL In C++, the vector size() is a built-in method used to find the size of a vector. The size of a vector tells us the number of elements currently present in the vector. In this article, we will learn about the vector size() method.Let's take a look at the simple code example:C++#include <bits/stdc 3 min read deque shrink_to_fit in C++ STL The deque::shrink_to_fit() is a built-in function in C++ STL which reduces the capacity of the container to fit its size and destroys all elements beyond the capacity. This function does not reduce the size of the container. It is used when a container has been allocated more memory than it needed t 3 min read sizeof() vs strlen() vs size() in C++ The string is a sequence of characters or an array of characters. The declaration and definition of the string using an array of chars are similar to the declaration and definition of an array of any other data type. This article focuses on discussing the three string functions: sizeof()strlen()size 4 min read Vector shrink_to_fit() in C++ STL In C++, vector shrink_to_fit() is a built-in function used to reduce the capacity of the vector to fit its size and destroys all elements beyond the size. In this article we will learn about vector shrink_to_fit() in C++.Let’s take a quick look at an example that illustrates vector shrink_to_fit() m 2 min read Conversion Operators in C++ In C++, the programmer abstracts real-world objects using classes as concrete types. Sometimes, it is required to convert one concrete type to another concrete type or primitive type implicitly. Conversion operators play an important role in such situations. It is similar to the operator overloading 4 min read stack empty() and stack size() in C++ STL The std::stack::size() and std::stack::empty() in C++ are built-in functions that are used to provide information about the size of the stack. They are the member functions of the std::stack container defined inside <stack> header file.stack::empty()The stack::empty() method is used to check w 2 min read Like