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Questions and Answers
What is the valid starting character for an identifier?
What is the valid starting character for an identifier?
Which of the following options is NOT allowed in an identifier?
Which of the following options is NOT allowed in an identifier?
How many characters of an identifier does the compiler consider?
How many characters of an identifier does the compiler consider?
What keyword is used to define a constant in C?
What keyword is used to define a constant in C?
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What is true about constants in C?
What is true about constants in C?
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Which term describes a set of instructions designed to operate computer hardware effectively?
Which term describes a set of instructions designed to operate computer hardware effectively?
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What type of constant represents a fixed value in a C program, such as '3.14' for π?
What type of constant represents a fixed value in a C program, such as '3.14' for π?
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Which of the following is NOT a fundamental data type in C?
Which of the following is NOT a fundamental data type in C?
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Which operator would you use to compute the remainder of a division in C?
Which operator would you use to compute the remainder of a division in C?
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When mixing different data types in expressions, what is often necessary?
When mixing different data types in expressions, what is often necessary?
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Which component is responsible for translating high-level code into machine code?
Which component is responsible for translating high-level code into machine code?
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What term refers to a logical structure that outlines the steps to solve a problem?
What term refers to a logical structure that outlines the steps to solve a problem?
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What does a variable in C programming represent?
What does a variable in C programming represent?
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Which of the following is a valid variable name?
Which of the following is a valid variable name?
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What does the declaration 'int number;' do?
What does the declaration 'int number;' do?
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How much memory is allocated for an integer variable in a 64-bit compiler?
How much memory is allocated for an integer variable in a 64-bit compiler?
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What is the difference between float and double types?
What is the difference between float and double types?
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Which statement is true regarding user-defined data types?
Which statement is true regarding user-defined data types?
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What keyword is used to represent the integer datatype in C?
What keyword is used to represent the integer datatype in C?
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Which of these is NOT a modifier for the integer datatype?
Which of these is NOT a modifier for the integer datatype?
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What is the characteristic of primary datatypes?
What is the characteristic of primary datatypes?
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What will happen if you try to change the value of a constant variable declared with 'const'?
What will happen if you try to change the value of a constant variable declared with 'const'?
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What symbol is used to create a constant using the preprocessor directive in C?
What symbol is used to create a constant using the preprocessor directive in C?
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Which of the following is NOT a rule for specifying a variable name in C?
Which of the following is NOT a rule for specifying a variable name in C?
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In the example provided, what does 'PI' represent?
In the example provided, what does 'PI' represent?
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Which of the following statements about variable declaration is true?
Which of the following statements about variable declaration is true?
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Which type of constant allows you to define a value that cannot be changed during the program runtime?
Which type of constant allows you to define a value that cannot be changed during the program runtime?
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If a variable name exceeds the maximum number of characters specified by the compiler, what will happen?
If a variable name exceeds the maximum number of characters specified by the compiler, what will happen?
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What does the escape sequence in C represent?
What does the escape sequence in C represent?
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What does the #define directive accomplish in a C program?
What does the #define directive accomplish in a C program?
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Which of the following is an example of a unary operator in C?
Which of the following is an example of a unary operator in C?
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How many operands does a binary operator require?
How many operands does a binary operator require?
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Which of the following is NOT categorized as an arithmetic operator?
Which of the following is NOT categorized as an arithmetic operator?
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Which statement correctly describes a logical operator?
Which statement correctly describes a logical operator?
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What does the increment operator (++) do in a C program?
What does the increment operator (++) do in a C program?
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Which operator is specifically used for assignment in C?
Which operator is specifically used for assignment in C?
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What is the role of conditional operators in C?
What is the role of conditional operators in C?
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Study Notes
Software and Hardware
- Software is a set of instructions that tells the hardware how to perform a task.
- A program is a single set of instructions; a software is a collection of programs.
- System software operates the computer hardware efficiently.
- Application software helps users complete tasks such as word processing and web browsing.
Constants, Variables & Data Types
- A constant is a named memory location that holds a single value throughout program execution.
- Constants can be created using the "const" keyword or the "#define" preprocessor directive.
- Variables are named memory locations that can store different values with the same datatype during program execution.
- Variables must be declared to allocate the required memory space before use.
- Datatypes specify the range and type of values that can be stored in variables, constants, arrays, pointers, and functions.
- Primary datatypes are built-in, pre-defined datatypes like integer, floating-point, character, and void.
- Data types are used to determine the size of memory allocated for variables and the type of operations that can be performed on them.
Integer Datatypes
- The "int" keyword represents the integer datatype in C.
- Integer datatypes can be modified using keywords like "short", "long", "signed", and "unsigned".
Floating-Point Datatypes
- Floating-point datatypes represent numbers with decimal values.
- "float" and "double" are the two variants of floating-point datatypes.
- "float" stores up to 6 decimal places, “double” stores up to 15-19 decimal places.
Creating constants in C
- Using 'const' keyword:
- The syntax is
const datatype constantName;orconst datatype constantName = value; - Example:
const int x = 10;
- The syntax is
- Using '#define' preprocessor
- The syntax is
#define CONSTANTNAME value - Example:
#define PI 3.14
- The syntax is
Operators
- Operators tell the computer to perform specific mathematical or logical manipulations.
- Unary operators require a single operand (e.g., + or -)
- Binary operators require two operands (e.g., + or -).
Classification of Operators
- Arithmetic operators perform numeric calculations (e.g., +, -, *, /, %).
- Relational operators compare values (e.g., ==, !=, >, <, >=, <=).
- Logical operators combine expressions (e.g., &&, ||, !).
- Assignment operators assign values to variables (e.g., =, +=, -=, *=, /=, %=).
- Increment/Decrement operators increase or decrease the value of a variable by one (e.g., ++, --).
- Bitwise operators perform bit-level operations (e.g., &, |, ^, ~, <<, >>).
- Conditional operators evaluate expressions based on a condition (e.g., ? :).
Special Operators
- Special operators are used for specific purposes, such as obtaining the size of a data type (
sizeof) and accessing members of a structure or union (->,.)
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Description
This quiz covers fundamental concepts in computer science, focusing on software definitions, types, and the roles of constants, variables, and data types. Test your understanding of how software operates with hardware and the basics of memory allocation in programming.
