Note carefully that, even though it appears that there are three variables, there is really only one variable. The two pointers point to the single variable. This is illustrated in the next statement which assigns the value of 13 to the variable "index", because that is where the pointer "pt1" is pointing. The next "printf" statement causes the new value of 13 to be printed out three times.
Keep in mind that there is really only one variable to be changed, not three. This is admittedly a very difficult concept, but since it is used extensively in all but the most trivial C programs, it is well worth your time to stay with this material until you understand it thoroughly.
Keep in mind that there is really only one variable to be changed, not three. This is admittedly a very difficult concept, but since it is used extensively in all but the most trivial C programs, it is well worth your time to stay with this material until you understand it thoroughly.
