Basic Flowchart symbols

Start and End of program:

Computational or processing functions of a program:

Input or output or operation:

Decision Making and Branching:

Flow Line:

What is a Flowchart?

A flowchart is a formalized graphic representation of a logic sequence, work or manufacturing process, organization chart, or similar formalized structure.


Example:

Algorithms

An unambiguous set of steps, which when performed correctly by a processor, will result in a process being carried out in a finite time.

For example if you were to explain to someone how to make a cup of coffee you would be defining an algorithm;

1.   boil the water,

2.   place coffee in the cup,

3.   place sugar in the cup,

4.   add the boiling water,

5.   add milk,

6.   stir.

1.           Examine the algorithm above. What two properties of the algorithm enable it to correctly describe the solution to the problem of making a cup of coffee? What is it that makes an algorithm correct?(Hint: what would happen if you swapped step "6" and step "2"?)

An algorithm is correct if a sequence is followed in chronological order. \

Algorithm for posting letter:

1. Write Letter

2. Put letter in envelope

3. Seal envelope

4. Write desired recipient's address at the front of the envelope

5. Go to post box

6. Put Letter in the post box

Algorithm for making toast: 
1. Get bread
2. Put in toaster 
3. Wait 2-3 minutes while it toasts 
4. Take toast out 
5. Put on plate 
6. If desired apply any form spread on bread.


Algorithm for calling a friend on the phone.
1. Get phone.
2. Dial the correct number
3. Press green call button
4. Wait 30sec to 2 min for person to pick up 
5. If person does not pick up repeat steps 1-4 min.