Đề Thi FE PRF193 - SU26 - FE - RE

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PRF193 SU26 FE Multiple Choice Questions​

Question 1
(Choose 1 answer)
Which of the following C/C++ operators has the lowest precedence?
A. &&
B. ||
C. *
D. +
E. =
F. ? :

Question 2
(Choose 1 answer)
What will be the output of the following program?
#include <iostream>
using namespace std;
class R {
int a, b;
public:
R(int x, int y=5): a(x), b {}
int sum() const { return a + b; }
};
int main() {
R r1(2);
R r2(2,3);
cout << r1.sum() << " " << r2.sum();
return 0;
}
A. 7 5
B. 5 7
C. 2 3
D. Compilation error

Question 3
(Choose 1 answer)
Given the code:
int multiply(int a, int b) {
return a * b;
}
Which of the following correctly calls the multiply function?
A. int x = multiply(2, 3);
B. multiply();
C. int x = multiply(2);
D. int x = multiply("2", "3");

Question 4
(Choose 1 answer)
Which loop checks its condition after executing the loop body?
A. do-while loop
B. for loop
C. while loop
D. switch statement

Question 5
(Choose 1 answer)
What is the primary benefit of using functions in programming?
A. Increase the program size
B. Reduce code reusability
C. Break complex programs into manageable parts
D. Make debugging more difficult

PRF193 Multiple Choice Questions​

PRF193_SU26_RE_604413 . Multiple Choice

Question 6
(Choose 1 answer)

What will be the output of the following program?
#include <iostream>
using namespace std;
class InlineTest {
public:
inline int add(int a, int b) { return a + b; }
};
int main() {
InlineTest it;
cout << it.add(2,3);
return 0;
}

A. 2
B. 3
C. 5
D. Compilation error

Question 7
(Choose 1 answer)

What is the default underlying type of enumeration constants in C/C++?

A. char
B. int
C. float
D. double

Question 8
(Choose 1 answer)

What will be the output of the following program?
#include <iostream>
using namespace std;
class F {
int &r;
public:
F(int &x): r(x) {}
void set(int v) { r = v; }
};
int main() {
int a = 1;
F f(a);
f.set(5);
cout << a;
return 0;
}

A. 1
B. 5
C. Compilation error
D. Runtime error

Question 9
(Choose 1 answer)

Which of the following is a correct way to call a function named compute that takes no arguments and returns an int?

A. compute;
B. int result = compute();
C. int result = compute;
D. compute(int);

Question 10
(Choose 2 answers)

Which of the following is the correct way to declare a boolean variable in C++?

A. bool isTrue = true;
B. boolean isTrue = true;
C. bool isTrue = 1;
D. bool isTrue = T;
E. All of the others

PRF193 SU26 FE RE Questions 11 to 15​

PRF193_SU26_RE_604413 - Multiple Choice

Question 11
(Choose 1 answer)

What will be the output of the following program?
#include <iostream>
using namespace std;
class Base {
public:
virtual ~Base() { cout << "B"; }
};

class Derived : public Base {
public:
~Derived() { cout << "D"; }
};

int main() {
Base *p = new Derived();
delete p;
return 0;
}

A. BD
B. DB
C. B
D. D

Question 12
(Choose 1 answer)

Which of the following correctly declares an integer array of size 5 in C/C++?

A. int arr&#91;5&#93;;
B. array int arr = &#91;5&#93;;
C. int arr = new int&#91;5&#93;;
D. int arr{5};

Question 13
(Choose 2 answers)

Which of the following C/C++ statements correctly initializes an array with the values 1, 2, 3, 4, 5?

A. int arr&#91;&#93; = {1, 2, 3, 4, 5};
B. int arr&#91;5&#93; = {1, 2, 3, 4, 5};
C. int arr&#91;5&#93; = (1, 2, 3, 4, 5);
D. All of the others

Question 14
(Choose 2 answers)

What is the correct syntax to output "Hello, World!" in C/C++? choose 02 correct anwsers.

A. printf("Hello, World!");
B. cout << "Hello, World!" << endl;
C. System.out.println("Hello, World!");
D. echo "Hello, World!";

Question 15
(Choose 1 answer)

What will be the output of the following code snippet?
int x = 10;
if (x > 5)
x = x + 2;
else
x = x - 2;
printf("%d", x);

A. 12
B. 8
C. 10
D. 5

PRF193 SU26 FE Multiple Choice Questions​

Question 16
(Choose 2 answers)
What does the following C++ expression evaluate to?
int a = 3;
int b = 4;
bool result = (a < b) || (a == 3);
A. result is true
B. result is false
C. result is 1
D. result is 0
E. result is T
F. All of the others

Question 17
(Choose 2 answers)
Which of the following statements correctly defines a union in C/C++?
A. union Data { int i; float f; char str&#91;20&#93;; };
B. struct Data { int i; float f; char str&#91;20&#93;; };
C. union Data { int i; float f; char str&#91;20&#93;; } data;
D. All of the others

Question 18
(Choose 1 answer)
Which of the following is true about C++ std::string compared to C-style strings?
A. std::string automatically manages memory for string operations.
B. C-style strings are objects with member functions.
C. std::string requires manual handling of the null terminator.
D. C-style strings support operator overloading for concatenation.

Question 19
(Choose 1 answer)
Which loop construct is particularly useful when the number of iterations is determined by user input during the loop's execution?
A. for loop
B. while loop
C. do-while loop
D. foreach loop

Question 20
(Choose 1 answer)
Which of the following control structures is used to execute a block of code multiple times based on a condition?
A. if
B. switch
C. for
D. break

PRF193 Multiple Choice Questions​

Question 21
(Choose 1 answer)
What will be the output of the following program?
#include <iostream>
using namespace std;
class D {
double v;
public:
D(double d): v(d) {}
operator int() { return (int)v; }
};
int main() {
D x(3.9);
int y = x;
cout << y;
return 0;
}
A. 3
B. 4
C. Compilation error
D. Runtime error

Question 22
(Choose 1 answer)
Which function closes a file stream?
A. close()
B. finish()
C. stop()
D. end()

Question 23
(Choose 1 answer)
Which operator is used to perform integer division in C/C++?
A. /
B. %
C. //
D. div

Question 24
(Choose 1 answer)
What will be the output of the following C code snippet?
#include <stdio.h>
int main() {
int x = 10;
if (x > 5)
if (x > 15)
printf("High");
else
printf("Medium");
else
printf("Low");
return 0;
}
A. High
B. Medium
C. Low
D. No output

Question 25
(Choose 1 answer)
Which stream class is used for output file operations in C++?
A. ifstream
B. ofstream
C. fstream
D. stringstream

PRF193 Multiple Choice Questions​

Question 26
(Choose 1 answer)

What is the effect of calling join() on a std::thread object?
A. It detaches the thread from the main thread
B. It blocks the calling thread until the thread finishes execution
C. It terminates the thread immediately
D. It creates a new thread

Question 27
(Choose 1 answer)

What will be the output of the following code?
#include <iostream>
#include <vector>
using namespace std;

int main() {
int sum, count;
int ia&#91;&#93; = { 1, 3, 2, 5, 7 };

vector<int> v1(ia, ia + 3);
vector<int>::iterator it;
sum = 0;
for ( it = v1.begin(); it != v1.end(); ++it ) {
sum += *it;
}
cout << sum/v1.size() << " ";
cout << endl;
return 0;
}

A. 2
B. 6
C. 2.75
D. The code snippet has an execution error.

Question 28
(Choose 1 answer)

How do you correctly define a function in C that takes two integers and returns their sum?
A. int add(int a, int b) {
return a + b;
}
B. void add(int a, int b) {
return a + b;
}
C. int add(int a, int b);
D. add(int a, int b) {
return a + b;
}

Question 29
(Choose 1 answer)

Which of the following best describes polymorphism in OOP?
A. The ability to create multiple instances of a class
B. The ability of different classes to be treated as instances of the same class through inheritance
C. The ability to hide data within a class
D. The ability to overload operators

Question 30
(Choose 1 answer)

Which of the following is a value-returning function in C++?
A. void display(int a) {
cout << a;
}
B. int add(int a, int b) {
return a + b;
}
C. int main() {
// code
}
D. bool check(int a) {
// no return statement
}

PRF193 Multiple Choice Questions​

Question 31
(Choose 1 answer)
How can you ensure that a member function in a base class can be overridden in derived classes to achieve runtime polymorphism?
A. Declare the function as static
B. Declare the function as virtual
C. Use the override keyword
D. Make the function const

Question 32
(Choose 1 answer)
In C/C++, to access the name member of a structure variable Student s, which syntax is correct?
A. s.name
B. s->name
C. s:name
D. s@name

Question 33
(Choose 1 answer)
What is the purpose of the typedef keyword in C++?
A. To create a new type that is identical to an existing type
B. To declare a constant value
C. To define a macro
D. To allocate dynamic memory

Question 34
(Choose 1 answer)
Which of the following is a logical NOT operator in C/C++?
A. ^
B. &&
C. ||
D. &
E. !
F. ~

Question 35
(Choose 2 answers)
Which of the following correctly uses the enum to define colors and assigns Green to a variable c?
A. enum Color { Red, Green, Blue }; Color c = Green;
B. enum Color { Red, Green, Blue }; c = Green;
C. enum Color { Red = 1, Green = 2, Blue = 3 }; Color c = 2;
D. All of the others

PRF193 SU26 FE RE Questions 36 to 40​

PRF193_SU26_RE_604413 - Multiple Choice

Question 36
(Choose 1 answer)

What will be the output of the following code?
#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
using namespace std;

int main() {
int ia&#91;&#93; = { 1, 3, 2, 4, 7, 6, 8 };
vector<int> v1(ia, ia + 3), v2(5);
copy(v1.begin(), v1.end(), v2.begin());
vector<int>::iterator it;
for ( it = v2.begin(); it != v2.end(); ++it) {
cout << *it << " ";
}
cout << endl;
return 0;
}

A. 1 3 2 0 0
B. 1 3 2 4 7
C. 0 0 1 3 2
D. The code snippet has an execution error.

Question 37
(Choose 1 answer)

Given the following overloaded functions:
void show(int x);
void show(double y);
Which version is called by show(5.0);?

A. show(double)
B. show(int)
C. show(char)
D. Compilation error

Question 38
(Choose 1 answer)

Which of the following C++ operators is used for bitwise OR operator?

A. ||
B. |
C. &&
D. &
E. ^
F. !

Question 39
(Choose 1 answer)

What will be the result of compiling and running this program?
#include <iostream>
using namespace std;
class A { public: int x = 5; };
class B : private A {};
int main() {
B b;
cout << b.x;
return 0;
}

A. 5
B. Compilation error
C. 0
D. Runtime error

Question 40
(Choose 1 answer)

What will be the output of the following C++ code snippet?
#include <iostream>
using namespace std;

void modify(int &a) {
a = a + 10;
}

int main() {
int x = 5;
modify(x);
cout << x;
return 0;
}

A. 5
B. 10
C. 15
D. Error

PRF193 Multiple Choice Questions​

Question 41
(Choose 1 answer)
What is the size in bytes of the following structure on a system where int is 4 bytes and char is 1 byte?
struct Example {
int a;
char b;
int c;
};
A. 9
B. 10
C. 12
D. 8

Question 42
(Choose 1 answer)
Which of the following is a characteristic of procedural programming?
A. Emphasis on a linear sequence of processes
B. Focus on data encapsulation
C. Use of objects to combine data and behavior
D. Promotion of polymorphism

Question 43
(Choose 1 answer)
What is the maximum value that can be stored in a variable of type char (assuming char is signed and uses 1 byte)?
A. 127
B. 128
C. 255
D. -120

Question 44
(Choose 1 answer)
Which loop structure ensures that the loop body is executed at least once?
A. for loop
B. while loop
C. do...while loop
D. foreach loop

Question 45
(Choose 1 answer)
Which of the following statements correctly creates a pointer to an object car1 of class Car and allocates memory dynamically?
A. Car *carPtr = Car();
B. Car *carPtr = new Car();
C. Car carPtr = new Car;
D. Car carPtr = Car;

PRF193 Multiple Choice Questions​

Question 46
Which of the following best describes a class in C++?
A. A function that performs a specific task
B. A blueprint for creating objects, defining attributes and behaviors
C. An instance of an object
D. A type of pointer

Question 47
Which of the following is the correct way to declare an integer variable named count and initialize it to 10 in C++?
A. int count = 10;
B. int count(10);
C. int count{10};
D. All of the others

Question 48
What is the purpose of the return statement in a value-returning function?
A. To terminate the program
B. To exit the function without returning a value
C. To pass the computed value back to the caller
D. To declare a new variable

Question 49
What will be the output of the following program?
#include <iostream>
using namespace std;
class Counter {
public:
static int count;
Counter() { count++; }
static void printCount() { cout << count; }
};
int Counter::count = 0;

int main() {
Counter c1;
Counter c2;
Counter:rintCount();
return 0;
}
A. 1
B. 2
C. 0
D. Compilation error

Question 50
What is the result of the following C/C++ expression?
int a = 5;
int b = 2;
int c = a / b;
A. c is 2.5
B. c is 2
C. c is 3
D. Compilation error

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