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Finding String Length in C++

You can determine the length of a string (number of characters) using the length() or size() member functions.

Example: Using length() Function

#include <iostream>
#include <string>

int main() {
    std::string txt = "Hello, World!";
    std::cout << "Length of string: " << txt.length() << std::endl;
    return 0;
}

Output:

Length of string: 13

Key Takeaways

  • length() and size() functions return the number of characters in a string.
  • Useful for iterating over strings or validating input.
  • Both functions are interchangeable for std::string objects.
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