#include <stdio.h>
#include <ctype.h>
#include <string.h>


int main(void)
{
  char *a="abc";
  char *x="xyz";
  char *b="abc";
  char *y="Xyz";

  int r;

  if(isupper(y[0]))
  {
    printf("%c\n",y[0]);
  }

  if(r=(!strcmp(a,b)))
  {
    printf("%d\n",r);
  }

  printf("%c\n",*x);

  if(r=(!strcmp(a,x)))
  {
    printf("%d\n",r);
  }

  char bla[4]="aAc";

  for( unsigned int i = 0; i < 4; i += 1 )
  {
    if(isupper(bla[i])) {
      printf("%c\n",bla[i]);
    }
  }

  return 0;
}