What is the difference between std::string and a char array in C++?

Point	std::string	char array
Size	Grows by itself	Fixed
Join	a + b	strcat (can overflow)
Compare	a == b	strcmp
Length	size()	strlen
Safety	Safe	Buffer overflow risk

#include <cstring>
#include <iostream>
#include <string>

int main() {
    std::string s = "Hello";
    s += " World";
    std::cout << s << ' ' << s.size() << '\n';

    char c[] = "Hello";
    std::cout << sizeof(c) << ' ' << std::strlen(c) << '\n';      // 6 bytes (with \0), 5 characters
}

See C++ Strings.

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