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F452 Computing

3 Types of Statement

Initialisation Setting starting values of variables before the variable is used in an expression as the variable may have previous values from a previous run. E.g. Totals & Counts must be set to zero.
Assignment Sets the value of a variable. Can be written X = 0 or X  0 or X := 0.
Assignment/Comparison Notice the difference between the = in X = 5 (assignment operator) and IF X = 5 (comparison operator).
Comparing Strings Comparison of strings uses their character codes. Compares first characters code in the two strings if they are the same then the next character in the two strings is compared etc. Upper and lower case letters have different character codes.
Complex Boolean expressions IF Colour = “Red” OR “Black” is an error (although not syntactically). It should be IF Colour = “Red” OR Colour = “Black”.
Operator Precedence The default order in which operations in an expression are carried out. E.g. Division or multiplication done first and subtraction is done last.
Created by: Chelsea2760