Question

How to implement the strlen function in C

Answer 1

#include <stdio.h>

size_t strlen(const char* s) {
	// find length of s
	const char* p;

	for (p = s; *p != '\0'; p++)
		;
	return p - s;
}

int main(void) {
	char str[] = "c programming";

	printf("%zu", strlen(str));

	return 0;
}




/*
run:
    
13
    
*/

 

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