Why is char acting as int in for loop?

Question

#include "avr/io.h"
main()   
{ 
 unsigned char= z  ;  
 for(z=0;z<200;z++) 
  PORTA=z;  //PORTA dispalys the value of z
}

Please explain the working of the loop as z is char and is acting as int

Answer 1

char (and by extension, unsigned char) is an integral type. An unsigned char can hold values from 0 to 255.

Characters are typically stored in char variables as well. What they actually store is the ASCII value of the character in question. For example:

char c = 'A';

The variable c contains the value 65, which is the ASCII value of A.

In the case of this code, an unsigned char variable is being used in an integer context.