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Questions and Answers
Which of the following is a valid C++ identifier?
What is the output of the following code?
int x = 5; int y = x++; std::cout << y << std::endl;
What is the difference between a reference and a pointer in C++?
Which of the following is NOT a fundamental data type in C++?
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What is the purpose of the 'using namespace std;' statement in C++?
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What is the difference between a while loop and a do-while loop in C++?
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Study Notes
C++ Identifiers
- Identifiers must start with a letter or an underscore and can contain letters, digits, and underscores.
- Examples of valid identifiers:
myVariable,count_1,_temp - Identifiers are case-sensitive.
Code Output
- Given code:
int x = 5; int y = x++; std::cout << y << std::endl; - Output is
5becausex++returns the value ofxbefore incrementing it.
Reference vs Pointer
- References are aliases for existing variables, while pointers are variables that store the memory address of another variable.
- A reference must be initialized at declaration and cannot be null, while a pointer can be reassigned or can point to null.
Fundamental Data Types in C++
- Fundamental data types include
int,char,float, anddouble. - Types such as
stringandarrayare NOT considered fundamental types but rather complex or derived types.
'using namespace std;'
- This statement allows the use of features in the
stdnamespace without qualification. - Eliminates the need to prefix standard library objects and functions with
std::, e.g.,coutinstead ofstd::cout.
While Loop vs Do-While Loop
- A
whileloop checks its condition before executing the block, which means it may not execute at all if the condition is false initially. - A
do-whileloop executes its block at least once before evaluating the condition, ensuring that the block runs even if the condition is false.
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Description
Test your knowledge of the fundamentals of C++ programming with this quiz! Challenge yourself with questions about valid C++ identifiers, the output of specific code, and the differences between references and pointers. Perfect for beginners or those looking to brush up on their C++ skills.
