Revision 2.2 programming

Revision 2.2 programming

1. Constant: a value stored in a memory location which never changes

   • Variable: a value stored in a memory location which can change

2. Syntax error: errors in rules/grammar of the language e.g colon brackets

3. Logic error: the program is written to do something other than what the programmer intended

4. Run time error: an error which which can run without reporting an error e.g it runs without giving an output.

5. Data Types:

   • Real/Float: a number with a decimal point
   • Integer: a number without a decimal point
   • String: series of characters/text
   • Character: a single letter/symbol
   • Date/Time: date and time in any format
   • Boolean: yes or no/ true or false

6. Other info:

   • Concate note: to join different data types together
   • Comments: to add comments into your code to explain what you've done
   • Validation: a computer check to check if the data entered is sensible and reasonable it does not check the accuracy of the data

7. Sequence: completing steps in the order in which they happen

   • Selection: where a choice in the program is made depending on the condition or outcome
     • Iteration: act of repeating/looping a specific section of code
       • Count condition iteration: repeats a set number of times
       • Condition controlled: repeats until a condition is met or the program changes

8. Comparison operators

   • ==: equal to
   • != not equal to
   • < less than
   • <= less than or equal to
   • > greater than
   • >= greater than or equal to

9. Aritmetic operators

   • - subtraction
     • * multiplication
       • / division
         • + addition
           • MOD modulus
             • Div Quotient
               • ^ expontiation