String in function parameter

Question

int main()
{
        char *x = \"HelloWorld\";
        char y[] = \"HelloWorld\";

        x[0] = \'Z\';
        //y[0] = \'M\';

        return 0;
}

Answer 1

function("MyString");

is similar to

char *s = "MyString";
function(s);

"MyString" is in both cases a string literal and in both cases the string is unmodifiable.

function("MyString");

passes the address of a string literal to function as an argument.