Proper way to declare variable with uint8_t

Question

I am programming MicroChip's MCU using C, but when I initialize a variable with uint8_t by using these methods:

(uint8_t) distance = 0;

((uint8_t) distance = 0);

And these methods too (declaration):

(uint8_t) distance;

((uint8_t) distance);

But this is what I received after compilation:

error: use of undeclared identifier 'distance'

BTW, I'm a novice at C programming.

Any help is much appreciated.

Answer 1

stdint.h should define uint8_t.

So your .c-file needs to include the above mentioned .h-file before defining a variable of type uint8_t.

This could look like this:

#include <stdint.h> 

int main(void)
{
  uint8_t distance_uninitialised; /* Holds an indeterminated value. */
  uint8_t distance_initialised = 0;
}