if statement.....again...

[CyberCarsten]

I can't get this if statement to work....I know it something with the {}.....

if(ball.x > SCREEN_WIDTH - ball.width )
{
xangle = -xangle;
ball.xv = xangle;
ball.yv = yangle;
Move_BOB(&ball);
}

if(ball.x <0)
{
    xangle = xangle;
    yangle = yangle;
    ball.xv = xangle;
    ball.yv = yangle;
    Move_BOB(&ball);
}
if (ball.y < 0)
{
    xangle = xangle;
    yangle = yangle;
    ball.xv = xangle;
    ball.yv = yangle;
    Move_BOB(&ball);
}

if(ball.x > SCREEN_HEIGHT) 
{
    xangle = -xangle;
    yangle = -yangle;
    ball.xv = xangle;
    ball.yv = yangle;
    Move_BOB(&ball);
}