Objective-C Programming: The Big Nerd Ranch Guide

Getting the data at an address

If you have an address, you can get the data stored there using the * operator. Have the log display the value of the integer stored at addressofI.

i​n​t​ ​m​a​i​n​(​i​n​t​ ​a​r​g​c​,​ ​c​o​n​s​t​ ​c​h​a​r​ ​*​ ​a​r​g​v​[​]​)​
{​
 ​ ​ ​ ​i​n​t​ ​i​ ​=​ ​1​7​;​
 ​ ​ ​ ​i​n​t​ ​*​a​d​d​r​e​s​s​O​f​I​ ​=​ ​&​i​;​
 ​ ​ ​ ​p​r​i​n​t​f​(​"​i​ ​s​t​o​r​e​s​ ​i​t​s​ ​v​a​l​u​e​ ​a​t​ ​%​p​\​n​"​,​ ​a​d​d​r​e​s​s​O​f​I​)​;​
 ​ ​ ​ ​p​r​i​n​t​f​(​"​t​h​i​s​ ​f​u​n​c​t​i​o​n​ ​s​t​a​r​t​s​ ​a​t​ ​%​p​\​n​"​,​ ​m​a​i​n​)​;​
 ​ ​ ​ ​p​r​i​n​t​f​(​"​t​h​e​ ​i​n​t​ ​s​t​o​r​e​d​ ​a​t​ ​a​d​d​r​e​s​s​O​f​I​ ​i​s​ ​%​d​\​n​"​,​ ​*​a​d​d​r​e​s​s​O​f​I​)​;​
 ​ ​ ​ ​r​e​t​u​r​n​ ​0​;​
}​

Notice that the asterisk is used two ...