1. Start

2. More Loops 03/14/11 Look at geometric series example.

3. Other Loops for-loop and do-while

4. for - loop  Can use while-loop for all repetition  for is useful for counting

5. Example //Add first ten integers int total = 0; for (int n = 1; n <= 10; n++)‏ total = total + n; cout << total; OUTPUT: 55

6. Syntax of for for(intialization; repetition cond; update) statement; for(intialization; repetition cond; update) { //Code of for-loop block }  Initialization done upon entry.  Condition must be true, check each time.  Update done after each iteration, before condition is checked.

7. while vs. for int total = 0; for (int n = 1; n <= 10; n++)‏ total = total + n; total = 0; int n=1; while (n <= 10)‏ { total = total + n; n++ ; }

8. Other Examples  Input the rainfall for the week: forrain.cpp  To find a Fibonacci number. fib.cpp

9. Output Geometric Series A geometric series is defined by: a + ar + ar 2 + ar 3 +... + ar n-1 a is first term, r is common ratio, and n is number of terms. Write a function to take a, r and n then return the sum. Start with an algorithm

10. Algorithm Parameters: a, r, n term = a (1 st term is a) sum = term for(i from 2 to n) – Find ith term, term*r – Add term to sum Output sum

11. Geometric Series Program geometric.cpp  Program started.  Let's provide the function, using a for-loop.

12. Do-while loop do { stmts; } while (bool. expr.)‏  Executed Once  Then condition check

13. dowhile  dowhile.cpp

14. What is needed?  Finish for loop in countdown.cpp