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);
sizeof operator.
lenstr - User written version of strlen.
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