strlen will give you the length of a string, NOT including the '\0' terminator. It should not be confused with the sizeof operator which returns the size of a variable (that could hold a string).
Library:   string.h
Prototype: size_t strlen(const char *s);
Syntax:	   size_t size;
	   char string[20]="red dwarf";
           size = strlen(string);
 Example program.
 Example program.
 strlen man page.
 strlen man page.
 sizeof operator.
sizeof operator.
 lenstr - User written version of strlen.
 lenstr - User written version of strlen.
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