suppose that account identification number are written using

suppose that account identification number are written using nine digits, for example, 972-54-5990.what C variable type should be used to store these

Solution

The program should use an int data type to store each 9 digits of account identification number because an int type of data takes only 4 bytes per number.
On the other hand, if an array of char were used to store each 9 digits of account identification number, that would take 9 bytes per number.

Therefore, for optimum memory utilisation , \"int\" data type should be used to store all 9 digits of account identification number.