Annoying problem

I have this code:

Code:

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int x,y;
long a=0,b=0,dx=0,dy=0;
dx=x1-x0;
dy=y1-y0;
a=dy/dx;
b=y0-a*x0;

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When dx is larger than dy In the last line 'a' is always. In debug it acts like a is an Int. I don't get it.
Why?

Quote:

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Originally Posted by spikeyz

I have this code:

Code:

---

int x,y;
long a=0,b=0,dx=0,dy=0;
dx=x1-x0;
dy=y1-y0;
a=dy/dx;
b=y0-a*x0;

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When dx is larger than dy In the last line 'a' is always. In debug it acts like a is an Int. I don't get it.
Why?

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The code has undeclared variables.

What is x1? x0? y1? y0?

Second, you divide an integer type by an integer type, you get an integer result. Integer/intergral types include int, short, long, char, and the unsigned varieties of those. If you want floating point, then use float or double types.

Regards,

Paul McKenzie

I would also check if dx is non-zero before performing such a division:

Quote:

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Originally Posted by spikeyz

Code:

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a=dy/dx;

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