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

void test() {

  char string[] = "Hi there!";
  char string2[] = "Hello &";

  printf("String:  %s\n", string);
  printf("String2: %s\n", string2);
  printf("Different format:  %p\n", string);


  printf("String one char at the time: ");
  int i = 0;
  for (i = 0; i < strlen(string); i++) {
      printf("%c", string[i]);
  }
  printf("\n and null character: %d\n", string[strlen(string)]);

    
  // We can modify any character
  string[5] = string[0];

  printf("String is %s\n", string);


  // ... and now sum fun ...
  // Let's create a bug on purpose! We are
  // overwriting the null character for string2
  printf("String length is %lu\n", strlen(string2));
  string2[strlen(string2)] = ' ';
  
  printf("String length after is %lu\n", strlen(string2));

  // When we try to print the string, we read
  // through memory until the first '\0'
  printf("String is %s\n", string2);

}


// Now how to access command-line arguments
// and how to manipulate strings
int main(int argc, char** argv) {

  int i;
  for ( i  = 1; i < argc; i++ ) {
      printf("Next argument is %s\n", argv[i]);
  }

  test();

  char s1[20] = "Blue ";
  char s2[] = "gray";
  strcat(s1,s2); // But better to use strncat or strlcat
  printf("\nConcat string is %s\n", s1);

  return 0;
}