C++ cstring strlen() function
Example
Measure the length of a C-style string:
char myStr[20] = "Hello World";
cout << strlen(myStr) << "\n";
cout << sizeof(myStr) << "\n";
Definition and Usage
The strlen() function returns the length of a string, which is the number of characters up to the first null terminating character. This is smaller than the amount of memory that is reserved for the string, which can be measured using the sizeof operator instead.
The strlen() function is defined in the <cstring> header file.
Syntax
strlen(char * str);Parameter Values
| Parameter | Description |
|---|---|
| str | Required. A string to measure the length of. |
Technical Details
| Returns: | An integer representing the length of the string. |
|---|
