C++ Program to Find the Length of a String

In this example, you will learn to compute the length (size) of a string (both string objects and C-style strings).

To understand this example, you should have the knowledge of the following C++ programming topics:

C++ Strings

You can get the length of a string object by using a size() function or a length() function.

The size() and length() functions are just synonyms and they both do exactly same thing.

Example: Length of String Object

#include <iostream>
using namespace std;

int main() {
    string str = "C++ Programming";

    // you can also use str.length()
    cout << "String Length = " << str.size();

    return 0;
}

Output

String Length = 15

Example: Length of C-style string

To get the length of a C-string string, strlen() function is used.

#include <iostream>
#include <cstring>
using namespace std;

int main() {
    char str[] = "C++ Programming is awesome";

    cout << "String Length = " << strlen(str);

    return 0;
}

Output