Phonetics Sensaphone ISACC 5000 Manuale Utente

Chapter 8:  C Programming

Arrays allow you to store a lot of related information in a convenient, organized fashion.  An
array lets you use one line of code to create a series of variables.   These variables share the
same basic name and are distinguished from one another by a numerical tag.

Example:

int count[10];

This means that an array named count has 10 members or “elements,” with each element
having its own value, starting with 0 and ending with 9.  The first element is count[0], the
second element is count[1], and so on up to count[9].  The type int means that the actual
numerical value of each element is an integer.

Example:

count[2] = 7

count[4] = 131

count[9] = 26

This program calculates a one-hour average temperature.  The array named "numbers" sets up
a series of variables from 0 to 60 to hold a value for input 1 for each minute in an hour.  The
60 values are totalled, then averaged.  The value of input 2 is then set to this average.

By using an array, the code becomes substantially more concise.  The program is first listed,
then followed by a section by section explanation of how it works.

int numbers[60];  /* array: input 1 value for each minute */

int x;            /* index to the array */

int total;        /* total of the input 1 values */

int average;      /* total/60 */

int oldminute;    /* minute counter */

main()

  {

  if (oldminute != minutes)

    {

    oldminute = minutes;

    numbers[minutes] = input(1);

    total = 0;

    for (x=0;x<60;x=x+1)

      {

      total = total + numbers[x];

      }

    average = total/60;

    if ((total % 60) >= 30)

      {

      average = average + 1;

      }

    set_input(2,average);

    }

  }