c 2b 2b length of char array

1char* example = "Lorem ipsum dolor sit amet";
2int length = strlen(example);
3std::cout << length << '\n'; // 26

1#include <iostream>
2#include <string.h>
3
4using namespace std;
5
6int main()
7{
8    char *str = "ABC";
9    cout << strlen(str) << endl;
10    return 0;
11}

1#include <iostream>
2
3using namespace std;
4
5int main()
6{
7    char arr[] = "grepper";
8    cout << sizeof(arr) << endl;
9    return 0;
10    //    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
11}
12

1char* a = "ABC";
2int length = sizeof(a)/sizeof(char);

1Instead of sizeof() for finding the length of strings or character 
2arrays, just use strlen(string_name) with the header file
3#include <cstring>   
4it's easier.