Functions and Procedures in C++
practice.

How many types of returning values are present in c++?

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

#include<iostream>
using namespace std;
 
class Test
{
  protected:
    int x;
  public:
    Test (int i):x(i) { }
    void fun() const  { cout << "fun() const " << endl; }
    void fun()        {  cout << "fun() " << endl;     }
};
 
int main()
{
    Test t1 (10);
    const Test t2 (20);
    t1.fun();
    t2.fun();
    return 0;
}

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

#include <iostream>
#include <stdarg.h>
using namespace std;
float avg( int Count, ... )
{
    va_list Numbers;
    va_start(Numbers, Count);
    int Sum = 0;
    for (int i = 0; i < Count; ++i )
        Sum += va_arg(Numbers, int);
    va_end(Numbers);
    return (Sum/Count);
}
int main()
{
    float Average = avg(10, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9);
    cout << "Average of first 10 whole numbers : " << Average;
    return 0;
}

Which of the following implements the module in the program?

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

#include<iostream>
using namespace std;
 
int fun(int x = 0, int y = 0, int z)
{  return (x + y + z); }
 
int main()
{
   cout << fun(10);
   return 0;
}

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

#include <iostream>
using namespace std;
int main ()
{
    cout << "Value of __LINE__ : " << __LINE__ << endl;
    cout << "Value of __FILE__ : " << __FILE__ << endl;
    cout << "Value of __DATE__ : " << __DATE__ << endl;
    cout << "Value of __TIME__ : " << __TIME__ << endl;
    return 0;
}

When will we use the function overloading?

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

#include <iostream>
using namespace std;
void copy (int& a, int& b, int& c)
{
    a *= 2;
    b *= 2;
    c *= 2;
}
int main ()
{
    int x = 1, y = 3, z = 7;
    copy (x, y, z);
    cout << "x =" << x << ", y =" << y << ", z =" << z;
    return 0;
}

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

#include <iostream>
using namespace std;
void square (int *x, int *y)
{
	*x = (*x) * --(*y);
}
int main ( )
{
	int number = 30;
	square(&number, &number);
	cout << number;
	return 0;
}

What is the default return type of a function?

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

#include <iostream>
#include <string>
using namespace std;
string askNumber(string prompt = "Please enter a number: ");
int main()
{
    string number = askNumber();
    cout << "Here is your number: " << number;
    return 0;
}
string askNumber(string prompt)
{
    string number;
    cout << prompt;
    cin << number;
    return number;
}

What are mandatory parts in the function declaration?

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

#include <iostream>
using namespace std;
int add(int a, int b);
int main()
{
    int i = 5, j = 6;
    cout << add(i, j) << endl;
    return 0;
}
int add(int a, int b )
    {
        int sum = a + b;
        a = 7;
        return a + b;
    }

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

#include <iostream>
using namespace std;
int max(int a, int b )
{
    return ( a > b ? a : b );
}
int main()
{
    int i = 5;
    int j = 7;
    cout << max(i, j );
    return 0;
}

How many types of modularization are there in c++?

By default how the value are passed in c++?

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

#include <iostream>
using namespace std;
void PrintSequence(int StopNum)
{
    int Num;
    Num = 1;
    while (true) 
    {
        if (Num >= StopNum)
            throw Num;
        cout << Num;
        Num++;
    }
}
int main(void)
{
    try 
    {
        PrintSequence(20);
    }
    catch(int ExNum)
    {
        cout << "Caught an exception with value: " << ExNum;
    }
    return 0;
}

What will we not do with function pointers?

Which header file is used to pass unknown number of arguments to function?

What will be the new value of x in the following C++ code?

#include <iostream>
using namespace std;
void fun(int &x)
{
    x = 20;
}
int main()
{
     int x = 10;
     fun(x);
     cout << "New value of x is " << x;
     return 0;
}