C | static | extern | const

Pourquoi l'élément n'est t-il pas une constante ? merci

Code:

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const unsigned int position_jeu_centree_X = (Largeur_Ecran_jeu_x-PLAY_WIDTH_SIZE)/2;
const unsigned int position_jeu_centree_Y = (Hauteur_Ecran_jeu_Y-PLAY_HEIGHT_SIZE)/2;

messages d'erreurs :

Code:

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gcc  -std=c99 -lglut -lGL -lGLU -lpng -Wall -g -c end_game.c -o end_game.o
end_game.c:22:45: error: initializer element is not constant
 const unsigned int position_jeu_centree_X = (Largeur_Ecran_jeu_x-PLAY_WIDTH_SIZE)/2;
                                             ^
end_game.c:23:45: error: initializer element is not constant
 const unsigned int position_jeu_centree_Y = (Hauteur_Ecran_jeu_Y-PLAY_HEIGHT_SIZE)/2;

C | static | extern | const | define