C++ Language Test 3

    Question 1: C++ Boolean Data Type

    What values can a bool data type hold in C++?

    Question 2: C++ Logical Operators

    Which of the following is the correct logical AND operator in C++?

    Question 3: C++ Null Pointer

    How can we assign a null value to a pointer in modern C++?

    Question 4: C++ Else-If Ladder

    Which statement is true about an else-if ladder in C++?

    Question 5: C++ Do-While Loop

    Which of the following differentiates a do-while loop from a while loop?

    Question 6: C++ Guess the Output – Reading File

    Suppose "data.txt" contains 1234. What will this program print?

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

int main() {
    ifstream file("data.txt");
    int x;
    file >> x;
    cout << x;
    file.close();
    return 0;
}

    Question 7: C++ Guess the Output – Pass by Value

    What will be the output of the following code?

    #include <iostream>
using namespace std;

void change(int x) {
    x = 20;
}

int main() {
    int a = 10;
    change(a);
    cout << a;
    return 0;
}

    Question 8: C++ Size of Array

    If we declare int arr[10]; then what is sizeof(arr) (assuming int takes 4 bytes)?

    Question 9: C++ Inheritance

    Which symbol is used to denote inheritance in C++?

    Question 10: C++ Character Access

    How can we access the 3rd character of a string s?

    Question 11: C++ Guess the Output - Floating Point Precision

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

    #include <iostream>
using namespace std;
int main() {
    float x = 5.0/2;
    cout << x;
    return 0;
}

    Question 12: C++ Guess the Output – Logical NOT

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

    #include <iostream>
using namespace std;
int main() {
    bool x = true;
    cout << !x;
    return 0;
}

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

    What will be the output of this program?

    #include <iostream>
using namespace std;

int main() {
    int arr[3] = {10, 20, 30};
    int *p = arr;
    cout << *(p + 2);
    return 0;
}

    Question 14: C++ Guess the Output – Else If Ladder

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

    #include <iostream>
using namespace std;
int main() {
    int marks = 75;
    if (marks > 90)
        cout << "Grade A";
    else if (marks > 60)
        cout << "Grade B";
    else
        cout << "Grade C";
    return 0;
}

    Question 15: C++ Guess the Output – Do-While Loop

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

    #include <iostream>
using namespace std;
int main() {
    int i = 5;
    do {
        cout << i << " ";
        i++;
    } while (i < 5);
    return 0;
}

    Question 16: C++ File Opening Multiple Modes

    Which of the following opens a file for both reading and writing?

    Question 17: C++ Pass by Reference

    Which of the following correctly demonstrates pass by reference in C++?

    Question 18: C++ Guess the Output – Array Traversal

    What will be the output of the following code?

    #include <iostream>
using namespace std;

int main() {
    int arr[3] = {1, 2, 3};
    for(int i = 0; i < 3; i++) {
        cout << arr[i] << " ";
    }
    return 0;
}

    Question 19: C++ Guess the Output – Function Overloading

    What will this program print?

    #include <iostream>
using namespace std;

class Math {
public:
    int add(int a, int b) { return a + b; }
    double add(double a, double b) { return a + b; }
};

int main() {
    Math m;
    cout << m.add(2, 3) << " " << m.add(2.5, 3.5);
    return 0;
}

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

    What will the following code print?

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

int main() {
    string s = "Programming";
    cout << s.substr(0, 4);
    return 0;
}