find the length of char array in c++ code example

Example 1: c++ length of char*

#include 
#include 

using namespace std;

int main()
{
    char *str = "ABC";
    cout << strlen(str) << endl;
    return 0;
}

Example 2: length of a char array in c

char chararray[10];
size_t len = strlen(chararray);

Example 3: how to find length of character array in c++

#include 

using namespace std;

int main()
{
    char arr[] = "grepper";
    cout << sizeof(arr) << endl;
    return 0;
    //    keep it in mind that character arrays have length of one more than your characters because last one is for \0 to show that word has ended
}