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

#include <iostream>
#include <sstream>
using namespace std;
int main()
{
    stringstream mys(ios :: in | ios :: out);
    std :: string dat("The double value is : 74.79 .");
    mys.str(dat);
    mys.seekg(-7, ios :: end);
    double val;
    mys >> val;
    val = val*val;
    mys.seekp(-7,ios::end);
    mys << val;
    std :: string new_val = mys.str();
    cout << new_val;
    return 0;
}

What does the 'sizeof' operator return in C++?

A. Size of a data type in bits

B. Size of a data type in bytes

C. Size of a variable in bytes

D. Size of a variable in bits

Which of the following is not a fundamental data type in C++?

A. Char

B. Float

C. String

D. Double

What is the purpose of the 'static' keyword in C++?

A. To declare a variable with dynamic storage duration

B. To declare a constant

C. To declare a variable with external linkage

D. To declare a variable with static storage duration

What is the difference between '++i' and 'i++' in C++?

A. None of the above

B. They both have the same effect

C. '++i' increments the value of 'i' before returning it, while 'i++' increments the value of 'i' after returning it

D. '++i' increments the value of 'i' after returning it, while 'i++' increments the value of 'i' before returning it