Computer-science_A-level_Cie
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computers-and-components6 主题
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logic-gates-and-logic-circuits2 主题
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central-processing-unit-cpu-architecture6 主题
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assembly-language-4 主题
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bit-manipulation1 主题
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operating-systems3 主题
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language-translators2 主题
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data-security3 主题
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data-integrity1 主题
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ethics-and-ownership3 主题
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database-concepts3 主题
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database-management-systems-dbms-1 主题
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data-definition-language-ddl-and-data-manipulation-language-dml1 主题
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computational-thinking-skills1 主题
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algorithms14 主题
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data-types-and-records2 主题
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arrays2 主题
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files1 主题
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introduction-to-abstract-data-types-adt1 主题
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programming-basics1 主题
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constructs2 主题
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structured-programming1 主题
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program-development-life-cycle2 主题
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program-design-2 主题
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program-testing-and-maintenance3 主题
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user-defined-data-types1 主题
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file-organisation-and-access-3 主题
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floating-point-numbers-representation-and-manipulation3 主题
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protocols2 主题
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circuit-switching-packet-switching1 主题
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processors-parallel-processing-and-virtual-machines5 主题
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boolean-algebra-and-logic-circuits4 主题
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purposes-of-an-operating-system-os3 主题
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translation-software3 主题
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encryption-encryption-protocols-and-digital-certificates3 主题
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artificial-intelligence-ai4 主题
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recursion1 主题
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programming-paradigms4 主题
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object-oriented-programming7 主题
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file-processing-and-exception-handling2 主题
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data-representation5 主题
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multimedia3 主题
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compression2 主题
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networks-and-the-internet11 主题
logic-gates
Logic gates
What is a logic gate?
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A logic gate is a visual way of representing a Boolean expression
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The logic gates covered in this course are:
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AND
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OR
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NOT
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XOR
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NAND
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NOR
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AND
|
Expression operator |
Circuit symbol |
Function |
|---|---|---|
|
(A AND B) |
 |
Returns TRUE only if both inputs are TRUE TRUE AND TRUE = TRUE Otherwise = FALSE |
OR
|
Expression operator |
Circuit symbol |
Function |
|---|---|---|
|
(A OR B) |
 |
Returns TRUE if either input is TRUE TRUE OR FALSE = TRUE FALSE OR FALSE = FALSE |
NOT
|
Expression operator |
Circuit symbol |
Function |
|---|---|---|
|
(NOT A) |
 |
Reverses the input value NOT TRUE = FALSE NOT FALSE = TRUE |
XOR (exclusive OR)
|
Expression operator |
Circuit symbol |
Function |
|---|---|---|
|
(A XOR B) |
 |
Returns TRUE if either input is TRUE but NOT both TRUE OR FALSE = TRUE FALSE OR FALSE = FALSE TRUE OR TRUE = FALSE |
NAND (not and)
|
Expression operator |
Circuit symbol |
Function |
|---|---|---|
|
(A NAND B) |
 |
Returns TRUE if either or both inputs are FALSE TRUE OR FALSE = TRUE FALSE OR FALSE = TRUE TRUE OR TRUE = FALSE |
NOR (not OR)
|
Expression operator |
Circuit symbol |
Function |
|---|---|---|
|
(A NOR B) |
 |
Returns TRUE if both inputs are FALSE TRUE OR FALSE = FALSE FALSE OR FALSE = TRUE TRUE OR TRUE = FALSE |
Truth tables
What is a truth table?
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A truth table is a tool used in logic and computer science to visualise the results of Boolean expressions
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They represent all possible inputs and the associated outputs for a given Boolean expression
AND
|
Circuit symbol |
Truth Table |
|---|---|
|
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