#include <stdio.h>

void main(void) {
  char* s1 = "ABCD";
  char s2[] = { 'a','b','c','d','e','\0' };
  char s3[50];
  for (int i = 0; i < 10; i++) {
    s3[i] = '0' + i;
  }
  s3[10] = 0x00;
  printf("%s\n", s1);
  printf("%s\n", s2);
  printf("%s\n", s3);
}