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Scratch - Conditionals & Iteration | Computer Application: Class 10 PDF Download

Scratch - Conditionals & Iteration | Computer Application: Class 10  A statement is a directive that tells the computer to do something. A Boolean expression is an expression that is either true or false. In Scratch, any block shaped like an elongated diamond is a Boolean expression.
  A condition is thus said to "evaluate to true" or "evaluate to false." In Scratch, any block whose label says "if," "when," or "until" is a sort of conditional construct. A loop can induce multiple executions of statements. In Scratch, any block whose label begins with «forever» or «repeat» is a looping construct.
A variable is a placeholder for some value, much like x and y are popular variables in algebra. In Scratch, variables are represented with blocks shaped like elongated circles, uniquely labelled by you. Variables, generally speaking, can be local or global. In Scratch, a local variable can be used by just one sprite; a global variable can be used by all of your sprites.
An event, then, is like a message from one thread to another. In Scratch, blocks whose labels begin with "broadcast" signal events whereas blocks whose labels begin with "when" handle events effectively represent threads themselves.
Scratch has 5 conditional and looping statements:
Scratch - Conditionals & Iteration | Computer Application: Class 10

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FAQs on Scratch - Conditionals & Iteration - Computer Application: Class 10

1. What are conditionals in Scratch?
Ans. Conditionals in Scratch are statements that allow the program to make decisions based on certain conditions. They are used to control the flow of the program by executing different sets of code depending on whether a condition is true or false.
2. How do you use if-else statements in Scratch?
Ans. To use if-else statements in Scratch, you can drag and drop the blocks from the "Control" category. The "if" block is used to check a condition, and if it is true, the code inside the block is executed. If the condition is false, the code inside the "else" block is executed.
3. What is the purpose of iteration in Scratch?
Ans. Iteration, also known as looping, allows you to repeat a set of code multiple times. It is useful when you want to perform a task repeatedly, such as drawing a pattern or processing a list of data. In Scratch, you can use the "repeat" block to create loops.
4. How do you create a loop in Scratch?
Ans. To create a loop in Scratch, you can use the "repeat" block. Drag and drop the block from the "Control" category and specify the number of times you want the loop to repeat. The code inside the loop will be executed that many times.
5. Can you nest conditionals and loops in Scratch?
Ans. Yes, you can nest conditionals and loops in Scratch. Nesting means placing one conditional or loop inside another. This allows you to create more complex behaviors and control the flow of your program in a more detailed manner. Just make sure to properly indent the blocks to indicate the nesting structure.
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