Questions and answers for exam Preparation

MCQs

Total Questions : 10

Question 1.

Which method do we use to append more than one character at a time?

append
operator+=
data
both a & b

Discuss Question

Answer: Option D. -> both a & b

None.

Question 2.

What is the output of this program?

1.
#include
2.
#include
3.
using namespace std;
4.
int main ()
5.
{
6.
string str ("Ubuntu");
7.
cout

61073741820
51073741820
6 and max size depends on compiler
none of the mentioned

Discuss Question

Answer: Option C. -> 6 and max size depends on compiler

In this program, We are printing the capacity and max size of the string.
Output:
$ g++ stri5.cpp
$ a.out
61073741820

Question 3.

What is the output of this program?

1.
#include
2.
#include
3.
using namespace std;
4.
int main ()
5.
{
6.
string str ("Microsoft");
7.
for (size_t i = 0; i < str.length();)
8.
{
9.
cout

M
Microsoft
Micro
runtime error

Discuss Question

Answer: Option D. -> runtime error

This program will terminate because the cout element is out of range.

Question 4.

What is the output of this program?

1.
#include
2.
#include
3.
using namespace std;
4.
int main ()
5.
{
6.
string str ("steve jobs is legend");
7.
string::iterator it;
8.
str.erase (str.begin()+ 5, str.end()-7);
9.
cout

jobs is
steve legend
steve
none of the mentioned

Discuss Question

Answer: Option B. -> steve legend

In this program, We are leaving the first 5 characters and last 7 characters and we are erasing

the remaining the characters.
Output:
$ g++ stri3.cpp
$ a.out
steve legend

Question 5.

What is the output of this program?

1.
#include
2.
#include
3.
using namespace std;
4.
int main ()
5.
{
6.
string str ("nobody does like this");
7.
string key ("nobody");
8.
size_t f;
9.
f = str.rfind(key);
10.
if (f != string::npos)
11.
str.replace (f, key.length(), "everybody");
12.
cout

nobody does like this
nobody
everybody
everybody does like this

Discuss Question

Answer: Option D. -> everybody does like this

rfind is used to find the characters in the string and replace is used to replace with certain characters.
Output:
$ g++ stri2.cpp
$ a.out
everbody does like this

Question 6.

What is the output of this program?

1.
#include
2.
#include
3.
using namespace std;
4.
int main ()
5.
{
6.
string str ("microsoft");
7.
string::reverse_iterator r;
8.
for (r = str.rbegin() ; r < str.rend(); r++ )
9.
cout

microsoft
micro
tfosorcim
tfos

Discuss Question

Answer: Option C. -> tfosorcim

'rbegin' is used to reverse the given the string.
Output:
$ g++ stri1.cpp
$ a.out
tfosorcim

Question 7.

What is the output of this program?

1.
#include
2.
#include
3.
using namespace std;
4.
int main ()
5.
{
6.
char str1[10] = "Hello";
7.
char str2[10] = "World";
8.
char str3[10];
9.
int len ;
10.
strcpy( str3, str1);
11.
strcat( str1, str2)
12.
len = strlen(str1);
13.
cout

Discuss Question

Answer: Option D. -> 10

In the program, We are concatanating the str1 and str2 and printing
itâ€™s total length. So the length is 10.
Output:
$ g++ stri.cpp
$ a.out
10