C++ reference: cstring: strlen

strlen
size_t strlen ( const char * string );

string.h

cplusplus.com

Return string length.
Returns the number of characters in string before the terminating null-character.

Parameters.

string: Null-terminated string.

Return Value.
The length of string.

Portability.
Defined in ANSI-C.

Example.

/* strlen example */
#include <stdio.h>
#include <string.h>

main ()
{
  char szInput[256];
  printf ("Enter a sentence: ");
  gets (szInput);
  printf ("Sentence entered is %u characters long\n",strlen(szInput));
  return 0;
}

Output:
Enter sentence: just testing Sentence entered is 12 characters long

See also.
strcmp, strcspn, strchr, strrchr