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Object Oriented Programming MCQ - Find Output

1 The following program fragment
int i=10;
void main ( )
{
int i=20;
{
int i=30.;
cout << i << :: i ;
}
}

:: is basically meant to manipulate a global variable, in case a local variable also has the same name.

2 A function abc is defined as
void abc (int x=0, int y=0)
{
cout << x << y;
}
Which of the following function calls is/are illegal? (Assume h, g are declared as integers)

Both the arguments are optional. All the calls are legal.

3 The following c++ code results in
#include "iostream.h"
void main (void)

{
cout << (int i=5) << (int j=6);

4 The statements
int a = 5; cout << "FIRST" << (a <<2) << "SECOND";
outputs

The symbol << has a context sensitive meaning. The << in (a << 2) means shifting a by 2 bits to the left, which is nothing but multiplying it by 4. So, a < <2 will be 5 x 4 = 20 and hence the output will be FIRST20SECOND.

5 The following program fragment
void main ( )
{
int x=10;
int &p=x;
cout << &p << &x;
}

int &p=x aliases p to x. This means they refer to the same memory location. So, the address of x will be same as that of p.

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Question:

The following programvoid abc (int &p){cout << p ;}void main (void){float m = 1.23;abc (m) ;cout << m;}

A. results in compilation error
B. results in run time error
C. prints 1. 23
D. prints I

Correct answer: A

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