[C++ / GrAPic] Conway's Game of Life

#include <Grapic.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>

using namespace grapic;
const int DIMW = 900;

int intval (float x) { return x; }

void init (bool World[DIMW][DIMW]) {
    int quotient, reste, cons = DIMW/20;
    for (int i = 0; i < DIMW*DIMW/100; i++) {
        quotient = i*10/DIMW;
        reste = i - (quotient * DIMW / 10);
        World[quotient][reste] = rand() % 2;
    }
}

void update (bool World[DIMW][DIMW]) {
    bool tmp[DIMW][DIMW];
    int quotient, reste, somme;
    for (int i = 0; i < DIMW*DIMW/100; i++) {
        quotient = i*10/DIMW;
        reste = i - (quotient * DIMW / 10);
        somme = 0;
        if ( quotient > 0        and reste > 0       )  somme  = World[quotient-1][reste-1];
        if ( quotient > 0                            )  somme += World[quotient-1][reste];
        if ( quotient > 0        and reste < DIMW/10 )  somme += World[quotient-1][reste+1];
        if (                         reste > 0       )  somme += World[quotient][reste-1];
        if (                         reste < DIMW/10 )  somme += World[quotient][reste+1];
        if ( quotient < DIMW/10  and reste > 0       )  somme += World[quotient+1][reste-1];
        if ( quotient < DIMW/10                      )  somme += World[quotient+1][reste];
        if ( quotient < DIMW/10  and reste < DIMW/10 )  somme += World[quotient+1][reste+1];
        tmp[quotient][reste] = (abs(somme-2.5) <= 0.75)*World[quotient][reste] + (somme == 3)*(!World[quotient][reste]);
    }
    for (int i = 0; i < DIMW*DIMW/100; i++) {
        quotient = i*10/DIMW;
        reste = i - (quotient * DIMW / 10);
        World[quotient][reste] = tmp[quotient][reste];
    }
}

void draw (bool World[DIMW][DIMW]) {
    int quotient, reste, somme;
    for (int i = 0; i < DIMW*DIMW/100; i++) {
        quotient = i*10/DIMW;
        reste = i - (quotient * DIMW / 10);
        color(255,255,255,255*World[quotient][reste]);
        rectangleFill(quotient*10,reste*10,quotient*10+10,reste*10+10);
    }
}

int main(int, char**) {

    bool stop = false;
    int del = 50;
    srand(time(NULL));

    winInit("Jeu de la vie",DIMW,DIMW);
    backgroundColor(0,0,0);

    bool World[DIMW][DIMW];

    initialisation:
    init(World);

    while (!stop) {
        winClear();
        update(World);
        draw(World);
        stop = winDisplay();
        delay(del);
        if (isKeyPressed(SDLK_SPACE))
            goto initialisation;
        if (isKeyPressed(SDLK_DOWN))
            del += 5;
        if (isKeyPressed(SDLK_UP) and del >= 5)
            del -= 5;
        color(255,255,255);
    }

    winQuit();
    return 0;

}