What is the output of the following
snippet?
#include <iostream>
using namespace std;
namespace OuterSpace
{
int x = 1;
int y = 2;
}
namespace InnerSpace
{
float x = 3.0;
float y = 4.0;
}
int main()
{
{using namespace InnerSpace;
cout << x << " ";
}{
using namespace OuterSpace; using InnerSpace::y;
cout << y;
}
return 0;
}
·
3 4
·
3
1
·
3
2
·
Compilation
error
What is the output of the following
snippet?
#include <iostream>
using namespace std;
int main(int argc, const char *argv[])
{
float B = 32;
{ char B = '1'; cout<<B;}
{ int B = 2; cout<<B;}
cout<<B;
return 0;
}
·
1322
·
None
of these
·
3212
·
3122
What is the output of the following
snippet?
#include <iostream>
using namespace std;
int main()
{
int i = 0;
for(; i < 5; i++);
cout<<i;
return 0;
}
·
01234
·
4
·
012345
·
5
What is the output of the following
snippet?
#include <iostream>
#include <string>
using namespace std;
struct S
{
char *p;
};
class C
{
S s;
public:
C() {s.p = new char; *s.p = 'A';}
void p() {cout <<++(*s.p);}
};
int main()
{
C *c = new C();
c->p();
return 0;
}
·
Compilation
error
·
It
prints garbage value
·
B
·
A
What is the output of the following
snippet?
#include <iostream>
#include <string>
using namespace std;
class One
{
char value;
public:
One() {value = 'A';}
One(char v): value(v){}
void set(char c) {this -> value =c;}
void set(){this->value ='d';}
char get() {return value;}
};
int main()
{
One o1,*o2;
o2 = new One('b');
One *p;
p = &o1;
p->set();
p = o2;
p->set('c');
cout<<o2->get() - o1.get();
return 0;
}
·
-1
·
Compilation
fails
·
0
·
1
What is the output of the following
snippet?
#include <iostream>
using namespace std;
int doit(int a, float b)
{
return a / b;
}
int main()
{
float x = doit(1.5f, 21);
cout<<x<<":"<<doit(1,1.f);
return 0;
}
·
0:1
·
1:0
·
1:1
·
0:0
What is the output of the following
snippet?
#include <iostream>
using namespace std;
int doit(int i, int j = 0)
{
return (i * j);
}
int main()
{
cout<<doit(doit(1,2));
return 0;
}
·
1
·
0
·
12
·
112
What is the output of the following
snippet?
#include <iostream>
using namespace std;
class Alpha {
public: char out(){ return 'A'; }
};
class Beta : public Alpha {
public: virtual char out(){ return 'B';
}
};
class Gamma : public Beta {
public: char out(){ return 'G'; }
};
int main()
{
Alpha *a = new Alpha();
Alpha *b = new Beta();
Alpha *c = new Gamma();
cout << (a->out()) << (b->out()) <<
(c->out());
return 0;
}
·
AAA
·
BBB
·
ABG
·
GGG
What is the output of the following
snippet?
#include <iostream>
using namespace std;
char max(char x, char y) {
if(x > y)
return y;
else
return x;
}
int main()
{
char chr = max('a', 'z');
cout << chr;
return 0;
}
a
Compilation error
z
az
What is the output of the following
snippet?
#include <iostream>
#include <string>
using namespace std;
class One {
public: float f;
One(float f) { this -> f = f; }
};
class Two {
public: float f;
Two (One o) { this -> f = o.f; }
void foo() { cout << (int)f; }
};
int main()
{
One o1(3.14);
Two o2 = o1;
o2.foo();
}
3.14
3
Compilation fails
0
What is the output of the following
snippet?
#include <iostream>
#include <string>
using namespace std;
class cmplx{
double re, im;
public:
cmplx() : re(1),im(1) {}
cmplx(double r, double i) : re(r),im(i) {}
cmplx operator+(cmplx &);
void out() { cout << "(" << re <<
"," << im << ")"; }
};
cmplx cmplx::operator+ (cmplx &a){
cmplx c (this->re + a.re, this->im + a.im);
return c;
}
int main()
{
cmplx x(1,2),y,z;
z = x + y;
z.out();
return 0;
}
(2,3)
(2,2)
(3,3)
(3,2)
What is the output of the following
snippet?
#include <iostream>
using namespace std;
int main() {
int a = 0;
if (++a == 1) {
cout << (a >> 1);
} else {
cout << (a);
}
return 0;
}
2
None of these
0
1
What is the output of the following
snippet?
#include <iostream>
using namespace std;
int doit(int x)
{
return x << 1;
}
int main()
{
int i;
i = doit(1) || doit(0);
cout << i;
return 0;
}
1
0
true
false
Which code, inserted into the main
function, generates the output 12?
#include <iostream>
#include <string>
using namespace std;
string fun(string s1, string s2)
{
return s1 + s2;
}
int main()
{
string s="1", *t = &s;
//insert code here
return 0;
}
fun(*t,s);
fun(*t,"2");
fun("1", *t);
fun("1+2");
What is the output of the following
snippet?
#include <iostream>
using namespace std;
int main()
{
char *abc;
abc = new char[26];
for(int i = 0; i < 26; i++)
abc[i] = 'a' + i;
cout << *(abc + 2);
return 0;
}
c
b
a
d
What is the output of the program if the
value of 1 is supplied as input?
#include <iostream>
using namespace std;
class Uno {
public: char Char;
};
int main()
{
int swtch;
Uno u;
u.Char = '5';
cin >> swtch;
try
{
switch (swtch)
{
case 3: throw 1;
case 2: throw 3.f;
case 1: throw u;
}
}
catch (int e)
{ cout << e; }
catch (Uno e)
{ cout << e.Char; }
catch (...)
{ cout << "?"; }
return 0;
}
3
1
5
Compilation error
What is the output of the following
snippet?
#include <iostream>
using namespace std;
int main()
{
const char c = '!';
const char *p;
p = &c;
*p = '?';
cout<<*p;
return 0;
}
!
Prints address of c
?
Compilation fails
What is the output of the following
snippet?
#include <iostream>
#include <cstdarg>
using namespace std;
int calculate(int &val, int arg)
{
val *= arg;
return arg;
}
int main()
{
int i = 1;
int j = calculate(i,2);
cout << i << j;
return 0;
}
21
11
22
12
How many times will the program print
HI!?
#include <iostream>
using namespace std;
int X = 5;
int main()
{
cout << "HI!";
if(X-- > 0)
main();
return 0;
}
Two
One
Six
Five
Which code, inserted into class C,
generates the output by? Choose all correct answers.
#include <iostream>
#include <string>
using namespace std;
class Uno {
protected: char y;
public: char z;
};
// insert code here
{
public:
void set(){
y = 'a'; z = 'z';
}
void out() { cout << ++y <<
--z; }
};
int main(){
Due b;
b.set();
b.out();
return 0;
}
class Due : protected Uno
class Due : private Uno
class Due : public Uno
class Due
What is the output of the following
snippet?
#include <iostream>
#include <string>
using namespace std;
class Class1 {
char a;
protected:
char b;
public:
char c;
Class1() { a='a'; b='b'; c='c'; }
};
class Class2: public Class1 {
char d;
public:
void set() {
c = 'e';
d = 'd';
}
};
int main(){
Class2 a;
a.set();
cout << a.c << a.d;
return 0;
}
cd
bd
ed
Compilation fails
What is the output of the following
snippet?
#include <iostream>
using namespace std;
struct S {
int a;
char b;
struct {
float a;
int b;
} c;
};
int main (int argc, const char *argv[])
{
S s = { 1, 2, 3, 4 };
cout << s.c.a << s.c.b;
}
14
12
34
23
What is the output of the following
snippet?
#include <iostream>
using namespace std;
int doit(int i, int j = 0)
{
return (i * j);
}
int main()
{
bool t[] = {false, true, false & true};
string u[2] = {"false", "true"};
bool *p;
p = t + 2;
cout << u[*p];
return 0;
}
1
false
true
0
What is the output of the following
snippet?
#include <iostream>
using namespace std;
#define CALL(parm) {if(parm)
cout<<parm++;}
int main()
{
int i = 1;
CALL(i);
cout<<i;
return 0;
}
1
12
2
11
Which statement will you add in the
following program to make it correct?
#include <string>
int main()
{
std::string s = "Here I am!";
std::cout<<s;
return 0;
}
#include
#include
#include
#include
What is the output of the following
snippet?
#include <iostream>
using namespace std;
int main()
{
int x = -2, y;
float f = 2.5, g;
g = x;
y = f;
cout<<(int)g / y;
return 0;
}
0.8
-0.8
-1
1
What is the output of the following
snippet?
#include <iostream>
#include <string>
using namespace std;
int main()
{
string s1 = "top";
string s2;
s2.append(s1).append("down");
cout<<s2;
return 0;
}
downtop
down
top
topdown
What is the output of the following
snippet?
#include <iostream>
using namespace std;
class A
{
public: void out(){ cout <<
"A";}
};
class B: public A
{
public: void out(){ cout <<
"B";}
};
int main()
{
A *a;
a = new A();
a -> out();
a = new B();
a -> out();
return 0;
}
AB
BA
BB
AA
What is the output of the following
snippet?
#include <iostream>
using namespace std;
int main()
{
const PI = 3.14;
const PI2 = PI * PI;
cout<<PI2;
return 0;
}
3
9.8596
3.14
Compilation fails
What is the output of the following
snippet?
#include <iostream>
#include <string>
using namespace std;
int boo(int v)
{
v++;
return ++v;
}
int main()
{
float x = 3;
x = boo(x);
cout<<x;
return 0;
}
1
5
-1
3
What happens if we use the operator new
and the memory cannot be allocated?
#include <iostream>
#include <exception>
using namespace std;
int main()
{
long i = 2000000000;
try
{
char * test = new char[i];}
catch (bad_alloc& e)
{ cout<<"1";}
catch (exception& e)
{ cout<<"2";}
catch (...)
{ cout<<"3";}
return 0;
}
It prints 1
None of these
It prints 2
It prints 3
What is the output of the following
snippet?
#include <iostream>
#include <string>
using namespace std;
class Uno{
public: ~Uno() {cout <<
"X";}
};
void foo(Uno *d)
{
Uno e;
*d = e;
}
int main()
{
Uno *u = new Uno;
foo(u);
delete u;
return 0;
}
XX
XXX
X
XXXX
What is the output of the following
snippet?
#include <iostream>
#include <string>
using namespace std;
const int size = 3;
class Uno{
public: int n;
Uno(){n = 1;}
Uno(int v) {n = v;}
};
class Due : public Uno{
public:
int * arr;
Due(): Uno(){
arr = new int[n];
}
Due(int a): Uno(a){
arr = new int[n];
}
~Due() {delete arr;}
};
int main() {
Due d(2);
Due e;
cout << d.n + e.n;
return 0;
}
4
1
2
3
What is the output of the following
snippet?
#include <iostream>
using namespace std;
float doit(int a, int b)
{
return a * b;
}
float doit(float a, float b)
{
return a + b;
}
int main()
{
cout<<doit(doit(1,2),doit(3.f,4.f));
return 0;
}
9
21
14
Compilation error
What is the output of the following
snippet?
#include <iostream>
using namespace std;
int main()
{
int cnt = 10;
do {
cnt--;
if (cnt % 3 == 2)
break;
cout << cnt;
}
while(cnt);
return 0;
}
987654321
10987654321
9
109
What is the output of the following
snippet?
#include <iostream>
#include <string>
using namespace std;
class Uno{
public: int Int;
};
class Due : public Uno{
public: Due() {Int = 2;}
Due(int x) {Int = x == 0 ? 2 : x - 2;}
};
int main(){
Due d,d2(0);
cout << d.Int - d2.Int;
return 0;
}
1
3
0
2
What is the output of the following
snippet?
#include <iostream>
using namespace std;
int main()
{
int i = 2;
float f = 1.4;
char c = 'a';
bool b = true;
c += i + f + b;
cout << c;
return 0;
}
e
c
d
f
What is the output of the following
snippet?
#include <iostream>
using namespace std;
int main()
{
int i = 10;
float f = 2.5;
cout << float(i) / int(f);
return 0;
}
0.5
4
1
5
What is the output of the following
snippet?
#include <iostream>
#include <string>
using namespace std;
struct Who
{
string nick;
};
class She
{
Who * who;
public:
She(){
who = new Who;
who -> nick = "Jane";
}
string out(){
return who -> nick;
}
};
int main()
{
She they[2];
for(int i = 0; i < 2; i++)
cout << they[i].out();
return 0;
}
It prints nothing
JaneJane
Jane
Runtime error
Variable y in class Y, will be…
class X {
private: int x;
protected: int y;
public: int z;
};
class Y: protected X{
};
none of these
private
public
protected
What is the output of the following
snippet?
#include <iostream>
using namespace std;
int main()
{
int i = 8;
do{
i--;
cout << i--;
}
while(i);
return 0;
}
76543210
7531
6543210
6420
What is the output of the following
snippet?
#include <iostream>
#include <string>
using namespace std;
class Uno{
int val;
public: Uno(int x){val = x;}
int out(){return val;}
void operator++(int var){
val += val;
}
};
ostream &operator<<(ostream
&o, Uno u)
{
return o << u.out();
}
int main()
{
Uno i(2);
i++;
cout << i;
return 0;
}
4
3
2
1
What is the output of the following
snippet?
#include <iostream>
using namespace std;
bool compare(bool t, bool u)
{
return t < u;
}
int main()
{
cout << compare(true, false);
return 0;
}
0
true
1
false
What is the output of the following
snippet?
#include <iostream>
using namespace std;
class cmplx{
double re, im;
public:
cmplx(): re(0), im(0){}
cmplx(double x) {re = im = x;}
cmplx(double x, double y) {re = x; im = y;}
void out(){cout<<"(" << re << ","
<< im << ")";}
};
int main()
{
cmplx c(1,2), cc(c);
cc.out();
return 0;
}
(2,2)
(1,2)
(2,1)
(1,1)
What is the output of the following
snippet?
#include <iostream>
using namespace std;
class Sup{
public: virtual void out(){cout <<
"p";}
};
class Sub: public Sup{
public: virtual void out(){cout <<
"b";}
};
int main()
{
Sub sub;
Sup *sup;
sup = ⊂
sub.out();
return 0;
}
bb
pb
bp
pp
What is the output of the following
snippet?
#include <iostream>
#include <string>
using namespace std;
class Uno {
public: Uno() { cout <<
"X";}
};
Uno foo(Uno d)
{
Uno e = d;
return e;
}
int main()
{
Uno u;
foo(u);
return 0;
}
X
XXX
XXXX
XX
Which code, inserted into the function
main, generates the output 03 ?
#include <iostream>
using namespace std;
class Uno
{public: void foo(){cout <<
"0";}
void bar(){cout << "1";}
};
class Due: public Uno
{public: void foo(){cout <<
"2";}
void bar(){cout << "3";}
};
int main()
{
Due d;
//insert code here
d.bar();
}
d->Due::foo();
d.Uno::foo();
d.Due::foo();
d->Uno::foo();
What is the output of the following
snippet?
#include <iostream>
using namespace std;
int k = -1;
class Class
{
public: char *adr;
Class(){adr = new char[k];}
~Class() {delete[]adr;}
};
int fun(void)
{
Class object;
return 0.5f;
}
int main()
{
fun();
return 0;
}
0.5
0
1
Runtime error
Variable r in class C3, will be….
#include <iostream>
using namespace std;
class C1
{
public
int p;
private
int q;
protected int r;
};
class C2: private C1{};
class C3: public C2{};
private
None of these
public
protected
What is the output of the following
snippet?
#include <iostream>
using namespace std;
class X1{
public: virtual void foo() = 0;
};
class X2: public X1{
public: virtual void foo(){cout <<
"X2";}
};
class X3: public X1{
public: virtual void foo(){cout
<<"X3";}
};
int main()
{
X1 *a = new X2(), *b = new X3();
b->foo();
b->foo();
return 0;
}
X3X2
X3X3
X2X3
X2X2
.jpg)
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