C中的常量整数和数组初始化

Question

I have this expression:

const int numPlayers = 2;
player players[numPlayers];

This is an array of user-defined type players (using struct). However, I get an error saying that numPlayers has to be a constant value.

expression must have a constant value

What am I doing wrong?

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I have also initialized the array like this:

player *players = (player*)calloc(sizeof(player), numPlayers);

But I cannot access any of the local variables of the struct without the program crashing.

Answer 1

In C99, the below works fine inside a function. It is a variable length array (VLA).

const int numPlayers = 2;
player players[numPlayers];

Otherwise use a #define for a true constant .

#define numPlayers 2
player players[numPlayers];

Answer 2

const are not true constants, the compiler will not allow you to change the value only. I will suggest use #define numPlayers 2 instead.