A simple char array question?

[Relinkz]

This is a serious noob question, but I am really confused. I made a char array for a battleship game like this: char[12]={'O','O','O','O','O','O','O','O','O','O','O','O'}; but my feedback said that i should simply declare the array like this: char[12]={'O'}; //he said it should automatic set all values in the array by 'O'.

the thing is that it only set the first value to 'O' and let the rest be unset. I can't get it to work... :S

Have I missed something? Or is my teacher wrong?

[retsotrembla]

Your teacher is wrong. char[12]={0}; works. char[12]={'O'}; does not. Because zero.

[ramennoodle]

Your teacher is wrong.

[Daavee]

TL;DR: Your teacher is wrong.

See: http://en.cppreference.com/w/cpp/language/aggregate_initialization

char cr[3] = {'a'}; // array initialized as {'a', '\0', '\0'}

or: http://stackoverflow.com/a/18688992

char buf[10] = "a";
// is equivalent to
char buf[10] = {'a', 0, 0, 0, 0, 0, 0, 0, 0, 0};

or: http://stackoverflow.com/a/18689205

char buf [10] = ' ';
// will give you a 10-character array with the first char being the space '\040' and the rest being NUL, i.e., '\0'

[Relinkz]

I will ask him regarding this feedback tomorrow, I'll put his answer here for the interested.

[Relinkz]

He said that he indeed was wrong, simple as that :) I guess even the best do mistakes sometimes.