Note: Here, thearray s[] has 19 elements. Then I use strtok to split the string into tokens based on a delemeter and get the length of each sub string. And then find its length as shown in the program given below. sizeof() works at compile time. Indeed - just be careful that if the target is not a null terminated string, this will measure until it either randomly finds a null in memory, or triggers a memory protection fault in the course of that search. 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In C programming, a string is a sequence of characters terminated with a null character \0. It uses a number of non-obvious tricks to gain speed without dropping to assembly, including: getting to a character that's properly aligned reading those aligned parts of the string into an int (or some larger datatype) to read several chars at a time When the loop ends, the length of the string will be stored in the i variable. The method you're looking for is charAt. Learn to code interactively with step-by-step guidance. and Get Certified. Parewa Labs Pvt. Time Complexity: O(N)Auxiliary Space: O(1). Try Programiz PRO: Try hands-on C Programming with Programiz PRO. You can just use *p instead of *p!='\0' in while loop. 2)The main() calls the strlen() predefined function by passing string s as an argument. So please like this video and subscribe to my chan. To find the length of a string in C++ programming, you have to ask from user to enter the string first. 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