#include <iostream>
int main()
{
char s[256] = "";
std::cout << "input string: ";
std::cin.getline(s, sizeof(s));
size_t n = 0;
for(char* p = s; *p != '\0'; ++p) ++n;
std::cout << "length: " << n << std::endl;
}
#include <iostream>
int main()
{
char s[256] = "";
std::cout << "input string: ";
std::cin.getline(s, sizeof(s));
size_t n = 0;
for(char* p = s; *p != '\0'; ++p) ++n;
std::cout << "length: " << n << std::endl;
}