This is our first control structure. Ordinarily the computer starts with the first line and then goes down from there. Control structures change the order loops in c programming pdf statements are executed or decide if a certain statement will be run. So what does the program do?

The first time the computer sees this statement, a is zero, and zero is less than 5. In other words, while a is less than five, the computer will run the indented statements. Enter Numbers to add to the sum. Now that we have while loops, it is possible to have programs that run forever. Help, I’m stuck in a loop.

This will kill the program. Note: sometimes you will have to hit enter after the Control C. Waits until a password has been entered. The output looks very familiar, but the program code looks different.

0 implied as the starting point. 10 times as expected, but starting with 0 instead of 1. Notice how the for loop goes through and sets item to each element in the list. The first use is to go through all the elements of a list and do something with each of them. First the program starts with a old list. Next the program sorts the list.

This is so that any duplicates get put next to each other. Next the first element of the list is deleted so that the first item is not incorrectly thought to be a duplicate. Next a for loop is gone into. Each item of the list is checked to see if it is the same as the previous. If it is a duplicate was found.