PPT-COP 3275 – Iteration and loops

Instructor Diego RiveraGutierrez Administrative stuff Third Quiz on Friday 65 Homework 2 due tonight Questions Remember to be careful about input and following instructions Homework 345 will be cumulative . Iteration. We’ve seen many places where repetition is necessary in a problem.. We’ve been using the for loop for that purpose. For loops are called . definite. loops because we know how many times the loop needs to be executed. By . Shyam. . Gurram. Control Structure. In this chapter we have two different types of structures.. Conditional Structure. . Iterative Control Structure.. Conditional structure describe the if-then, if-then-else, if-then-else-. 29 . June 2016. Week 1, Day . 3. Day 2 Recap. Recap ♻♻ Frank Lin. 10-710 Structured Prediction. School of Computer Science. Carnegie Mellon . University. 2011-11-28. Talk Outline. Clustering. Spectral Clustering. Power Iteration Clustering (PIC). PIC with Path Folding. Loops in Python. Programming languages have mechanisms for explicitly controlling / changing the state of a program:. LOOPS!. for. x . in. [1,2,3]:. . print(x). for. loops: . definite. , . intentional. loop-body loop-body loop-body loop-body update-step update-step update-step update-step being able to pick up other imperative languages. If someone asks you to lo Iteration. Iteration just means we keep doing the same thing over and over until some threshold is reached, until a condition has been met.. We’ve already seen a definite or counted loop:. for i in range(15):. Describe for loops and their implementation in C . Describe their purpose. Specifically count-controlled loops. Count-controlled loops. We previous looked at executing a block of code a fixed number of times:. We’ve been using the for loop for that purpose. For loops are called . definite. loops because we know how many times the loop needs to be executed. There are situations where loops are needed but there is no way to determine ahead of time how many times they will run, this is an . Srinivas Pinisetty. Based on material from . Atze van der . Ploeg. , Wolfgang . Aherndt. ,... Weakest precondition rules. wp is a . computable. function!. wp(x . := e , . R. ) . = . R. [x . →e]. wp(. Sequencing. : the execution of statements and evaluation of expressions is usually in the order in which they appear in a program . text.. . Selection . (or alternation): a run-time condition determines the choice among two or more statements or . CS 115 Lecture For loops Taken from notes by Dr. Neil Moore Repeating yourself What if we wanted to play four rounds of a game? We could write code to play one round, but We need to do that four times each Why use loops in C language?. The looping simplifies the complex problems into the easy ones. It enables us to alter the flow of the program so that instead of writing the same code again and again, we can repeat the same code for a finite number of times. For example, if we need to print the first 10 natural numbers then, instead of using the . Fluency Text book. Learning Objectives. Trace the execution of a given for loop. Write a World-Famous Iteration for loop. Discuss the structure of nested loops. Explain the use of indexes. List the rules for arrays; describe the syntax of an array reference.