C++ Language Test 5

    Question 1: C++ Variable Initialization

    Which is the correct way to initialize a variable in C++?

    Question 2: C++ Ternary Operator

    Which of the following is the correct syntax of the ternary operator in C++?

    Question 3: C++ Pointers and Arrays

    Which of the following statements is true about arrays and pointers in C++?

    Question 4: C++ Nested If

    What is the output of the following C++ code snippet?

    #include <iostream>
using namespace std;
int main() {
    int x = 15;
    if (x > 10) {
        if (x < 20)
            cout << "Between 10 and 20";
        else
            cout << "Greater than 20";
    }
    return 0;
}

    Question 5: C++ Continue Statement in Loops

    What is the effect of the continue statement inside a C++ loop?

    Question 6: C++ Guess the Output – getline from File

    Suppose "note.txt" contains:
    C++ is fun!
    What will this program print?

    #include <iostream>
#include <fstream>
using namespace std;

int main() {
    ifstream file("note.txt");
    string line;
    getline(file, line);
    cout << line;
    return 0;
}

    Question 7: C++ Guess the Output – Recursion

    What will be the output of the following program?

    #include <iostream>
using namespace std;

int factorial(int n) {
    if (n == 0) return 1;
    return n * factorial(n - 1);
}

int main() {
    cout << factorial(4);
    return 0;
}

    Question 8: C++ Array and Functions

    When an array is passed to a function in C++, what is actually passed?

    Question 9: C++ this Pointer

    What does the this pointer in C++ represent?

    Question 10: C++ String to C-Style String

    Which function is used to convert a C++ string to a C-style character array?

    Question 11: C++ Global vs Local Variable

    Which statement is true about global and local variables in C++?

    Question 12: C++ Guess the Output – Mixed Operators

    What will be the output of the following C++ code snippet?

    #include <iostream>
using namespace std;
int main() {
    int a = 10, b = 4, c = 3;
    cout << a - b * c;
    return 0;
}

    Question 13: C++ Guess the Output – Pointer Size

    What will the output of the following program be (on a 64-bit system)?

    #include <iostream>
using namespace std;

int main() {
    int *p;
    double *q;
    cout << sizeof(p) << " " << sizeof(q);
    return 0;
}

    Question 14: C++ Ternary Operator as If-Else

    Which of the following C++ statements correctly uses the ternary operator to check if a number n is even or odd?

    Question 15: C++ Guess the Output – Continue

    What will be the output of the following C++ code snippet?

    #include <iostream>
using namespace std;
int main() {
    for (int i = 1; i <= 5; i++) {
        if (i == 3) continue;
        cout << i << " ";
    }
    return 0;
}

    Question 16: C++ Closing File

    Why is file.close() used in C++?

    Question 17: C++ Function Prototypes

    Why are function prototypes used in C++?

    Question 18: C++ Guess the Output – Array and Pointers

    What will the following code print?

    #include <iostream>
using namespace std;

int main() {
    int arr[] = {5, 10, 15};
    cout << *arr;
    return 0;
}

    Question 19: C++ Guess the Output – Destructor

    What will the program print?

    #include <iostream>
using namespace std;

class Sample {
public:
    Sample() { cout << "Constructor "; }
    ~Sample() { cout << "Destructor"; }
};

int main() {
    Sample s;
    return 0;
}

    Question 20: C++ Guess the Output – String Replace

    What will this code print?

    #include <iostream>
#include <string>
using namespace std;

int main() {
    string s = "HelloWorld";
    s.replace(5, 5, " C++");
    cout << s;
    return 0;
}