Test: Functions - 2 - EmSAT Achieve MCQ

What is the purpose of a function prototype?

Which of the following is not a valid function call in C++?

What is recursion in C++?

What is the output of the following code?

#include <iostream>
using namespace std;

void printNumbers(int n) {
    if (n > 0) {
        printNumbers(n - 1);
        cout << n << " ";
    }
}

int main() {
    printNumbers(5);
    return 0;
}

What is the purpose of a template in C++?

What is a lambda expression in C++?

What is the scope of a variable defined inside a function?

What will be the output of the following code?

#include <iostream>
using namespace std;

void myFunction(int& x) {
    x = 10;
}

int main() {
    int a = 5;
    myFunction(a);
    cout << a;
    return 0;
}

What will be the output of the following code?

#include <iostream>
using namespace std;

int myFunction(int x, int y) {
    return x + y;
}

int main() {
    int a = 5, b = 3;
    cout << myFunction(a, b);
    return 0;
}

What will be the output of the following code?

#include <iostream>
using namespace std;

int square(int x) {
    return x * x;
}

int main() {
    cout << square(square(2));
    return 0;
}

What will be the output of the following code?

#include <iostream>
using namespace std;

int sum(int a, int b) {
    return a + b;
}

int sum(int a, int b, int c) {
    return a + b + c;
}

int main() {
    cout << sum(1, 2) << " ";
    cout << sum(1, 2, 3);
    return 0;
}

What will be the output of the following code?

#include <iostream>
using namespace std;

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

int main() {
    cout << factorial(5);
    return 0;
}

What will be the output of the following code?

#include <iostream>
using namespace std;

template <typename T>
T add(T a, T b) {
    return a + b;
}

int main() {
    cout << add<int>(5, 2) << " ";
    cout << add<double>(2.5, 3.7);
    return 0;
}

What will be the output of the following code?

#include <iostream>
using namespace std;

int main() {
    int a = 5;
    auto lambda = [&a]() { return a; };
    a = 10;
    cout << lambda();
    return 0;
}

What will be the output of the following code?

#include <iostream>
using namespace std;

template <typename T>
void myFunction(T value) {
    cout << "Generic" << endl;
}

void myFunction(int value) {
    cout << "Integer" << endl;
}

int main() {
    myFunction(5);
    myFunction(3.14);
    return 0;
}

What will be the output of the following code?

#include <iostream>
using namespace std;

int main() {
    int x = 5;
    int& y = x;
    y = 10;
    cout << x;
    return 0;
}

What will be the output of the following code?

#include <iostream>
using namespace std;

int main() {
    int x = 5;
    auto lambda = [x]() mutable { x += 5; return x; };
    cout << lambda() << " ";
    cout << x;
    return 0;
}

What is the purpose of the scope resolution operator (::) in C++?

What is a function signature in C++?

Which of the following is true about default arguments in C++ functions?

What is the purpose of the "const" keyword in function declarations?

What is the difference between pass-by-value and pass-by-reference in function parameters?

What will be the output of the following code?

#include <iostream>
using namespace std;

void swap(int& a, int& b) {
    int temp = a;
    a = b;
    b = temp;
}

int main() {
    int x = 5, y = 10;
    swap(x, y);
    cout << x << " " << y;
    return 0;
}

What will be the output of the following code?

#include <iostream>
using namespace std;

int myFunction(int x) {
    if (x == 0)
        return 0;
    return x + myFunction(x - 1);
}

int main() {
    cout << myFunction(3);
    return 0;
}

What will be the output of the following code?

#include <iostream>
using namespace std;

void printNumbers(int n) {
    if (n <= 0)
        return;
    cout << n << " ";
    printNumbers(n - 1);
}

int main() {
    printNumbers(5);
    return 0;
}

What will be the output of the following code?

#include <iostream>
using namespace std;

int add(int a, int b) {
    return a + b;
}

double add(double a, double b) {
    return a + b;
}

int main() {
    cout << add(5, 2) << " ";
    cout << add(2.5, 3.7);
    return 0;
}

What will be the output of the following code?

#include <iostream>
using namespace std;

int factorial(int n) {
    if (n == 0 || n == 1)
        return 1;
    return n * factorial(n - 2);
}

int main() {
    cout << factorial(5);
    return 0;
}