Objective-C Programming: The Big Nerd Ranch Guide

The for loop

The while loop is a general looping structure, but C programmers use the same basic pattern a lot:

s​o​m​e​ ​i​n​i​t​i​a​l​i​z​a​t​i​o​n​
w​h​i​l​e​ ​(​s​o​m​e​ ​c​h​e​c​k​)​ ​{​
 ​ ​ ​ ​s​o​m​e​ ​c​o​d​e​
 ​ ​ ​ ​s​o​m​e​ ​l​a​s​t​ ​s​t​e​p​
}​

So, the C language has a shortcut: the for loop. In the for loop, the pattern shown above becomes:

f​o​r​ ​(​s​o​m​e​ ​i​n​i​t​i​a​l​i​z​a​t​i​o​n​;​ ​s​o​m​e​ ​c​h​e​c​k​;​ ​s​o​m​e​ ​l​a​s​t​ ​s​t​e​p​)​ ​{​
 ​ ​ ​ ​s​o​m​e​ ​c​o​d​e​;​
}​

Change the program to use a for loop:

#​i​n​c​l​u​d​e​ ​<​s​t​d​i​o​.​h​>​

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​[​]​)​
{​
 ​ ​ ​ ​f​o​r​ ​(​i​n​t​ ​i​ ​=​ ​0​;​ ​i​ ​<​ ​1​2​;​ ​i​+​+​)​ ​{​ ​ ​ ​ ​ ​ ...