[May-2022] CPA exam torrent C++ Institute study guide [Q13-Q35]

Q13. Which of the following is a correct way to define the function fun() in the program below?
#include <iostream>
#include <sstream>
#include <string>
using namespace std;
int main()
{
int a[2][2];
fun(a);
return 0;
}

Q14. What is the output of the program?
#include <iostream>
#include <string>
using namespace std;
int main()
{
string s1[]= {“H” , “t” };
string s;
for (int i=0; i<2; i++) {
s = s1[i];
if (i==0)
s.insert(1,”ow”);
else
s.push_back(‘o’);
cout << s;
}
return( 0 );
}

Q15. What happens if characters ‘w’, ‘o’, ‘r’, ‘l’ and ‘d’ are entered as input?
#include <iostream>
#include <string>
using namespace std;
int main()
{
string s1 = “Hello”;
string s2;
getline( cin, s2 );
cout << s1 + s2;
return( 0 );
}

Q16. What happens when you attempt to compile and run the following code?
#include <iostream>
using namespace std;
class A
{
public:
void Print(){ cout<<“A”;}
};
class B:public A
{
public:
void Print(){ cout<< “B”;}
};
int main()
{
A *obj;
A ob1;
obj = &ob1;
obj?>Print();
B ob2;
obj = &ob2;
obj?>Print();
}

Q17. What will happen when you attempt to compile and run the following code?
#include <iostream>
using namespace std;
int main()
{
const char *s;
char str[] = “Hello “;
s = str;
while(*s) {
cout << *++s;
*s++;
}
return 0;
}

Q18. What happens when you attempt to compile and run the following code?
#include <iostream> #include <string>
using namespace std;
class complex{
double re, im;
public:
complex() : re(1),im(0.4) {}
complex operator+(complex &t);
void Print() { cout << re << ” ” << im; }
};
complex complex::operator+ (complex &t){
complex temp;
temp.re = this->re + t.re;
temp.im = this->im + t.im;
return temp;
}
int main(){
complex c1,c2,c3;
c3 = c1 + c2;
c3.Print();
}

Q19. What happens when you attempt to compile and run the following code?
#include <iostream>
using namespace std;
void fun(int*);
int main()
{
int i=2;
fun(&i);
cout<<i;
return 0;
}
void fun(int *i)
{
*i = *i**i;
}

Q20. What happens when you attempt to compile and run the following code?
#include <iostream>
#include <string>
using namespace std;
struct Person {
string name;
int age;
};
class First
{
Person *person;
public:
First() {person = new Person;
person?>name = “John”;
person?>age = 30;
}
void Print(){
cout<<person?>name << ” “<< person?>age;
}
};
int main()
{
First t[2];
for (int i=0; i<2; i++)
t[i].Print();
}

Q21. Point out an error in the program.
#include <iostream>
using namespace std;
int main()
{
char s1[] = “Hello”;
char s2[] = “world”;
char *const ptr = s1;
*ptr = ‘a’;
ptr = s2;
return 0;
}

Q22. What happens when you attempt to compile and run the following code?
#include <iostream> #include <string> using namespace std;
class A {
int x;
protected:
int y;
public:
int z;
};
class B : private A {
string name;
public:
void set() {
x = 1;
}
void Print() {
cout << x;
}
};
int main () {
B b;
b.set();
b.Print();
return 0;
}

Q23. What happens when you attempt to compile and run the following code?
#include <cstdlib>
#include <iostream>
using namespace std;
inline float sum(float a,float b)
{
return a+b;
}
int main()
{
float a,b;
a = 1.5; b = 3.4;
cout<<sum(a,b);
return 0;
}

Q24. What happens when you attempt to compile and run the following code?
#include <iostream>
using namespace std;
int main (int argc, const char * argv[])
{
int x,y;
union t
{
char tab[2];
int i;
};
union t u;
u.tab[0] = 1;
u.tab[1] = 2;
u.i = 0; x = u.tab[0];
y = u.tab[1];
cout << x << “,” << y << “,” << u.i;
return 0;
}

Q25. Point out an error in the program.
#include <iostream>
using namespace std;
int main()
{
const int x=1;
int const *y=&x;
cout<<*y;
return 0;
}

Q26. What happens when you attempt to compile and run the following code?
#include <iostream>
using namespace std;
class First
{
public:
void Print(){ cout<<“from First”;}
};
class Second:public First
{
public:
void Print(){ cout<< “from Second”;}
};
void fun(First *obj);
int main()
{
First FirstObject;
fun(&FirstObject);
Second SecondObject;
fun(&SecondObject);
}
void fun(First *obj)
{
obj?>Print();
}

Q27. Which of the following is a user defined data type?
1: struct person { char name[20]; int age; };
2: int l=2;
3:
enum color {red,blue, green};
D.char c;

Q28. What happens when you attempt to compile and run the following code?
#include <iostream>
using namespace std;
int fun(int x);
int main() {
cout << fun(0);
return 0;
}
int fun(int x) {
if(x > 0)
return fun(x-1);
else
return 100;
}

Q29. What happens when you attempt to compile and run the following code?
#include <iostream>
using namespace std;
class First
{
public:
void Print(){ cout<<“from First”;}
};
class Second
{
public:
void Print(){ cout<< “from Second”;}
};
int main()
{
Second t[2];
for (int i=0; i<2; i++)
t[i].Print();
}

Q30. What happens when you attempt to compile and run the following code?
#include <iostream>
using namespace std;
class A
{
public:
void Print(){ cout<<“A”;}
};
class B:public A
{
public:
virtual void Print(){ cout<< “B”;}
};
int main()
{
A *obj;
A ob1;
obj = &ob1; obj->Print(); B ob2; obj = &ob2; obj->Print(); }

Q31. What happens when you attempt to compile and run the following code?
#include <iostream>
using namespace std;
int main(){
int i, j;
for(i = 0, j = 1; j < 2, i < 4; i++, j++);
cout << i << ” ” << j;
return 0;
}

Q32. What happens when you attempt to compile and run the following code?
#include <iostream>
using namespace std;
int f(int a, int b);
int main()
{
float b;
b = f(20,10);
cout << b;
return 0;
}
int f(int a, int b)
{
return a/b;
}

Q33. What happens when you attempt to compile and run the following code?
#include <iostream>
using namespace std;
int x=5;
static int y=0;
void myFunction(int a)
{
y=++a;
}
int main (int argc, const char * argv[])
{
int i=0;
myFunction(i);
cout<<y<<” “<<x;
}

Q34. What happens when you attempt to compile and run the following code?
#include <iostream>
#include <exception>
using namespace std;
class myClass : public exception
{
virtual const char* what() const throw()
{
return “My exception.”;
}
} obj;
int main () {
try
{
throw obj;
}
catch (exception& e)
{
cout << e.what() << endl;
}
return 0;
}

Q35. What is the output of the program?
#include <iostream>
using namespace std;
#define PRINT(i) cout<<i;
int main()
{
int y=2, z=3;
PRINT(y);
PRINT(z);
return 0;
}