Breakout - wall collisions work...sometimes

Question

I'm trying to get the ball to collide with all of the walls of the window. My current code works for the first 3 seconds of gameplay but then the ball will jiggle through a wall. I'll show you the code I currently have and any help in the right direction would be greatly appreciated.

// balls movement
#define b_move drand48()

// balls y velocity
double y_velocity = 2.0;

// balls x velocity
double x_velocity = 2.0;

int main(void)

while(lives > 0 && bricks > 0)
{
    // ball movement up and down
    move(ball, b_move, y_velocity);

    // collision for top and bottom of window  
    if (getY(ball) + getHeight(ball) >= getHeight(window))
    {
        y_velocity = -y_velocity;
    }

    else if (getY(ball) <= 0)
    {
        y_velocity = -y_velocity;
    }

    // ball movement left and right
    move(ball, x_velocity, b_move);

    //collision for left and right of window
    if (getX(ball) + getWidth(ball) >= getWidth(window))
    {
        x_velocity = -x_velocity;
    }

    else if (getX(ball) <= 0)
    {
        x_velocity = -x_velocity;
    }

    pause(10);
}

I just can't see what I need to change :(

Answer 1

I fixed my problem by getting rid of "b_move" and changing drand48() to actual ints. I also combined my if and if else statements into a single if statement by using "||"