CS Year 11
Exam questions
1.


Exam-Style Questions
1a. NAND gate
b. OR gate
2a. A      B      C
      0       0      

Two different kinds of loop

For Loop - is run a certain number of times
for i in range(10)

While Loop - is run while a certain condition is true
while x > 20:

Algorithm Planning and Design

Problem: Read in 10 numbers and display their total

Think about input - processing and storage - output.

We need to instruct the processor about a "Running Total"

We will start by setting the total to 0. We will set the count to zero. The count is how many numbers we have added.

Top Down Design Method

Total 10 numbers

Initialise values for running total       Input and process 10 numbers*       Display answer

                     |                                                                      |

               ________                                                             |

               |               |                                               ___________________

       Total=0       Count=0                                     |                 |                    |

                            Input a number    add number to total    add 1 to cart

*Process the numbers 10 times (repeat) enter a single number and add it to the running total.