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);
} 

[Zaffir]

What doesn't work (i'd like to know what to look for)?

[ISquishWorms]

Which if statement there are several? If it is the following if statement:

if(ball.x > SCREEN_WIDTH - ball.width )

you may want to try

if(ball.x > (SCREEN_WIDTH - ball.width) )

[CyberCarsten]

the problem is that is doesn't run any of them....

[ISquishWorms]

I know it something with the {}.....

Your braces look fine to me, have you tried printing the value of ball.x before each if statement to check its contents? Have you also checked to see that it is not executing the code within the braces by placing a print statement within each of the if braces for example:

if(ball.x <0)
{
    print "ball.x is less than zero.";
    xangle = xangle;
    yangle = yangle;
    ball.xv = xangle;
    ball.yv = yangle;
    Move_BOB(&ball);
}

[sunburnt]

if
Move_BOB(&ball)
changes the value of ball.x then more than one of your if statements may be executed. I would set them up as

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

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

but that may not be it.

[ISquishWorms]

Sunburnt, makes a very good point. I can not see anything wrong with the code I think it is more than likely the structuring of it and how you wish it to operate. This is partly why I suggested that you place print statements into the code as this would give you more of an understanding about what routes the code is currently taking and why.