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# std::strlen

From cppreference.com
< cpp‎ | string‎ | byte

Defined in header `<cstring>` |  |
std::size_t strlen( const char* str ); |  |

Returns the length of the given byte string.

### [edit] Parameters

str | - | pointer to the null-terminated byte string to be examined

### [edit] Return value

The length of the null-terminated string `str`.

### [edit] Example

Run this code

    #include <cstring>
    #include <iostream>

    int main()
    {
       const char str[] = "How many characters contains this string?";

       std::cout << "without null character: " << std::strlen(str) << '\n'
                 << "with null character: " << sizeof(str) << '\n';
    }

Output:

    without null character: 41
    with null character: 42

### [edit] See also

C documentation for strlen

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