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Casting Char to Int


jackchaos

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Is it possible to cast from Char to Int?

Like:

unsigned char a = 5;

unsigned int b = 1000;

int c = b * (int)a;
When I try to do such a thing I get the following error when running make:
Compiling main.c
Processor: 18F452
================================================
Linking project
error: missing definition for symbol "__mulint"
ERROR!

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why would you want to store an int in a var char?

I have a lookup table filled with unsigned chars that define the config and behavior of each and every pot. One of the items is a refresh interval that later gets multiplied by 500 (this may change later).

This is the only way I can see how to do it... and yes, I'm doing a multiplication the bad way (a = b*c).

I'm at work right now, but from what I see in this document. If I change my 500 (above) to 512

and do a bit shift like so:

a = 2 << 9; // a is 1024

or

a = 5 << 9; // a is 2560

This would be the equivalent of:

a = 2 * 512;

or

a = 5 * 512;

If this is true, I've solved that problem and I can make the changes when I get home.

Thanks again!

( audiocommander, yes. I meant 'a = 2 * 512;', It's corrected above. Thanks. )

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unsigned char two_dimensional_array[NUM_POTS][NUM_OPTIONS]

The array can only hold one value type. I'm storing all my config here and every value is a char.

I want the option to scale all the update intervals so the interval is later multiplied by another number which is higher than 255.

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