An algorithm is a step by step sequence of statements intended to solve a problem. An algorithm starts execution with the input data, executes the statements and finishes execution with the output data.

Model of the action with an assignment statement:
1. --farmer, goat, grass, wolf = L,L.L.L.
2. Farmer, goat:= R, R
3. -farmer, goat, grass, wolf = R.R.L,L
4. --farmer: = L
5. --farmer, goat, grass, wolf = L,R,L.L
6. farmer, grass: = R, R
7. --farmer, goat, grass, wolf = R,R,R,L
8. farmer, goat: = L, L
9. --farmer, goat, grass, wolf = L,L,R,L
10. farmer, wolf: = R.R
11. --farmer, goat, grass, wolf = R,L,R,R
12. farmer: = L
13. --farmer, goat, grass, wolf = L,L,K,R
14. farmer, goat: = R,R
15. -- farmer, goat, grass, wolf = R,R,R,R

1. --minimum (a,b)
2. -- inputs: a, b are real numbers.
3. --output: result: minimum (a,b)

There are three different types of chameleons: red chameleons, green chameleons, and blue chameleons.

As the values of the variables are changed, the state changes

The order in which the statements are executed may differ from the order in which they are written in the algorithm. This order of execution of statements is known as the control flow.

(i) Sequential Control Flow
(ii) Alternative Control Flow
(iii) Iterative Control Flow.

square_root(n)
--inputs: n is a real number, n > O.
--outputs: y is a real number such that y² = n.

Specification of an algorithm serves as a contract between the designer of the algorithm and the user of the algorithm because it defines the rights and responsibilities of the designer and the user.

There are three important control flow .statements to alter the control flow depending on the state.
(i) In sequential control flow, a sequence of statements are executed one after another in the same order as they are written.
(ii) In alternative control flow, a condition of the state is tested, and if the condition is true, one statement is executed; if the condition is false an alternative statement is executed.
(iii) In iterative control flow, a condition of the state is tested, and if the condition is true, a statement is executed. The two steps of testing the condition and executing the statement are repeated until the condition becomes false.

There are three important control flow statements to alter the control flow depending on the state.
(i) In sequential control flow, a sequence of statements are executed one after another in the same order as they are written
(ii) In alternative control flow, a condition of the state is tested, and if the condition is true, one statement is executed; if the condition is false, an alternative statement is executed.
(iii) In iterative control flow, a condition of the state is tested, and if the condition is true, a statement is executed. The two steps of testing the condition and executing the statement are repeated until the condition becomes false.