 Scratch Programming Lesson 5 Programming logic. We are going to learn… Initialize the variables SET VS CHANGE Operator (Part II) Use a variable as a counter.

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Scratch Programming Lesson 5 Programming logic

We are going to learn… Initialize the variables SET VS CHANGE Operator (Part II) Use a variable as a counter

Initialization give an initial setting of a variable or set an initial setting use “set” functions for example,

SET VS CHANGE See the following example… What are the effect respectively? The sprite will change its y co-ordinate by 10 whenever “up arrow key” is pressed The sprite will go to y=10 whenever “up arrow key” is pressed When the sprite is originally on y=10… The sprite will move up by changing y co-ordinate The sprite will stay on y=10

Operators (Part II) One number will be randomly chosen from the range given ANDORNOT True False True False These three are operators (i.e. return True or False)

Operators (Part II)(cont.) Extra functions ModRound Reminder after divisionRound off the value with decimal places Some more Maths function here

Use variable as a counter Two methods have the same result: Adv: easier to writeAdv: Can use the variable to set different cases at different values Disadv: cannot tell which repeat values is running Adv: more difficult to write

Task of the lesson Write a program to guess a random number from a range The sprite will give the user 3 chances for the user to enter a number from a range with lower limit of 1 -5 and upper limit from 5 – 10 If the number guess is correct, suitable display; e.g. music and background will be shown If the number guess is incorrect, suitable display; e.g. music and background will also be shown The number of guess left will be displayed on screen

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