string lenght

Question

how the string length of "chh" (strlen(chh)) is 10, if I don't put null at the end

#include <bits/stdc++.h>
using namespace std;

int main()
{
char ch[]="aruna";
char chh[]={'a','r','u','n','a'};

cout <<"strlen(ch) "<<strlen(ch)<<'\t'<<" sizeof(ch)= "<< sizeof(ch) << endl;
cout <<"strlen(chh) "<<strlen(chh)<<'\t'<<" sizeof(chh)= "<< sizeof(chh) << endl;
return 0;
}

Answer 1

All strings ends by "\0", so u can:
string c = "smth";
int len = 0;
int i = 0;
while (c[i] != "\0") {
len++;
I++;
}

Answer 2

in chh I didn't put null, so iam getting strlen as 10 , how it is 10

Answer 3

in chh I didn't put null, so iam getting strlen as 10 , how it is 10