char
  Character value or small integer
  1byte
  signed: -128 to 127
  unsigned: 0 to 255

You can use to find it out ;)

#include <stdio.h> /* including standard library */
//#include <windows.h> /* uncomment this for Windows */
 
 
int main(void)
{
   printf("char: %d bytes\n", sizeof(char) );
   return 0;
}