Help me in solving CLB041 problem

help
,
1

My issue

not able to understand

My code

#include <stdio.h>
#include <string.h>

int main(void) {
	char txt[] ="NumeroTres";
	printf(" The lenght of the word is:%d",strlen(txt));
	
	return 0;
}

Learning course: Learn C
Problem Link: CodeChef: Practical coding for everyone

2

string.h is a header file in C which contains built-in functions realated to strings.
strlen is one such function. It return the length of the function. Here the word is 10 alphabets long, so 10 is returned.