Classes and Objects in C++
practice.

Pick the incorrect statement about Character-Array.

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

#include <stdio.h> 
#include<iostream>
using namespace std;
int main()
{
    int x = 5, y = 5, z;
    x = ++x; y = --y;
    z = x++ + y--;
    cout << z;
    return 0;
}

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

#include <stdio.h> 
#include<iostream>
using namespace std;
int main()
{
    int num1 = 5;
    int num2 = 3;
    int num3 = 2;
    num1 = num2++;
    num2 = --num3;
    cout << num1 << num2 << num3;
    return 0;
}

Which of the following is correct way of concatenating two string objects in C++?

way 1:
string s1 = "hello";
string s2 = "world";
string s3 = s1 + s2;
 
way 2:
string s1 = "hello";
string s2 = "world";
string s3 = s1.append(s2);
 
way 3:
string s1 = "hello";
string s2 = "world";
string s3 = strcat(s1,s2);

What does the data type defined by union will do?

What is the name of | operator?

In which direction does the assignment operation will take place?

Which category of data type a class belongs to?

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

#include <iostream>
using namespace std;
class sample
{
    private:
    int a, b;
    public:
    void test()
    {
        a = 100;
        b = 200;
    }
    friend int compute(sample e1);
};
int compute(sample e1)
{
    return int(e1.a + e1.b) - 5;
}
int main()
{
    sample e;
    e.test();
    cout  << compute(e);
    return 0;
}

Which operator works only with integer variables?

What does a class in C++ holds?

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

#include <iostream> 
#include <string>
using namespace std; 
int main(int argc, char const *argv[])
{
	string str;
	cin>>str;
	cout<<str;
	return 0;
}

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

#include <iostream>
#include <string>
using namespace std;
 
class A
{
	mutable int a;
 
        public:
	int assign(int i) const {
		a = i;
	}
	int return_value() const {
		return a;
	}
 
};
 
int main(int argc, char const *argv[])
{
	A obj;
	obj.assign(5);
	cout<<obj.return_value();
}

What is the size of the heap?

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

#include <iostream>
#include <string>
using namespace std;
int main ()
{
  string str ("helloworld.");
  cout << str.substr(3).substr(4) << endl;
  return 0;
}

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

#include <iostream> 
#include <string>
using namespace std; 
int main(int argc, char const *argv[])
{
	char str[] = "Hello World";
	cout<<str[0];
	return 0;
}

Pick the correct statement about string objects in C++.

Why we use the "dynamic_cast" type conversion?

Which is used to return the number of characters in the string?

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

#include <iostream>
using namespace std;
int main()
{
    int a = 0;
    int b = 10;
    if ( a && b )
    {
        cout << "true"<< endl ;
    }
    else
    {
         cout << "false"<< endl ;
    }
    return 0;
}