String Literals

When we write a string literal, an array of characters is initialized with \0 appended at the end.

void foo (const char* character) {
    char c;
    int index = 0;
    while (
        (
            c = ( // (1)!
                * ( // (2)!
                    character // (3)!
                    + sizeof(char) // (4)!
                    * index  // (5)!
                )
            )
        )
        != '\0' // (6)!
    ) {
        std::cout << c;
        index++;
    }
    std::cout << std::endl;
}

int main () {
    foo("hi"); // (7)!
    return 0;
}

1. Assignment expression evaluates to rvalue.
2. Dereferencing the pointer to access the character stored at the memory location.
3. The const char* pointer acting as a reference point.
4. The size of the offset in bytes (for pointer arithmetic).
5. An indexed multiplier to iteratively increase the total offset (the character to read) relative to the reference point(the pointer).
6. Condition to exit the loop, that the character indicates end of a string.
7. "hi" results into an array of characters(h, i, \0) initialized in memory.

Also, having 2 string literals side by side does concatenation.

const char* text1 = "hello " "world";
const char* text2 = "hello world";

Both are same.