C++ Programming Questions and Answers – String – 1

This set of C++ Programming Multiple Choice Questions & Answers (MCQs) focuses on “String – 1”.

1. What is string objects in C++?
a) Stream of alphabets
b) A stream of well-defined characters
c) Stream of characters
d) A stream of characters terminated by \0
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2. What is Character-Array?
a) array of alphabets
b) array of well-defined characters
c) array of characters
d) array of characters terminated by \0
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3. Pick the incorrect statement about Character-Array.
a) Character-Array can be terminated by a null character(‘\0’)
b) Character-Array has a static size
c) Character-Array has a dynamic size
d) Character-Array has a threat of array-decay
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4. Pick the correct statement about string objects in C++.
a) String objects must be terminated by a null character(‘\0’)
b) String objects have a static size
c) String objects have a dynamic size
d) String objects use extra memory than required.
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5. What will be the output of the following C++ code?

#include <iostream> 
#include <string>
using namespace std; 
int main(int argc, char const *argv[])
{
	string str;
	cin>>str;
	cout<<str;
	return 0;
}

a) str
b) Input provided by the user
c) Error
d) Segmentation fault
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6. What will be the output of the following C++ code?

#include <iostream> 
#include <string>
using namespace std; 
int main(int argc, char const *argv[])
{
	char str[] = "Hello World";
	cout<<str[0];
	return 0;
}

a) H
b) e
c) Error
d) o
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7. What will be the output of the following C++ code?

#include <iostream> 
#include <string>
using namespace std; 
int main(int argc, char const *argv[])
{
	char str[10];
	cin>>str;
	cout<<str;
	return 0;
}

a) Compiler-time Error
b) Run-time Error
c) Input given by the user
d) Depends on the length of the string entered by the user
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length < 10

$ ./a.out 
Hello
Hello

length > 10
$ ./a.out 
C++Programming
*** stack smashing detected ***:  terminated
Aborted (core dumped)

8. What will be the output of the following C++ code if the string entered by the user is “Hello World”?

#include <iostream> 
#include <string>
using namespace std; 
int main(int argc, char const *argv[])
{
	string str;
	cin>>str;
	cout<<str;
	return 0;
}

a) Hello World
b) Hello
c) World
d) Error
View Answer

$ ./a.out 
Hello World 
Hello

9. Which header file is used to include the string object functions in C++?
a) #include <string.h>
b) #include <cstring>
c) #include <string>
d) #include <string.cpp>
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10. What will be the output of the following C++ code?

#include <iostream> 
#include <string>
using namespace std; 
int main(int argc, char const *argv[])
{
	char s1[6] = "Hello";
	char s2[6] = "World";
	char s3[12] = s1 + " " + s2;
	cout<<s3;
	return 0;
}

a) Hello World
b) Hello
c) World
d) Error
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11. What will be the output of the following C++ code?

#include <iostream> 
#include <string>
using namespace std; 
int main(int argc, char const *argv[])
{
	string s1 = "Hello";
	string s2 = "World";
	string s3 = s1 + " " + s2;
	cout<<s3;
	return 0;
}

a) Hello World
b) Hello
c) World
d) Error
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12. Which of the following is correct way of concatenating two string objects in C++?

way 1:
string s1 = "hello";
string s2 = "world";
string s3 = s1 + s2;
 
way 2:
string s1 = "hello";
string s2 = "world";
string s3 = s1.append(s2);
 
way 3:
string s1 = "hello";
string s2 = "world";
string s3 = strcat(s1,s2);

a) 1 and 2
b) 2 and 3
c) 1 and 3
d) 1, 2 and 3
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13. Which of the following is not a modifier function in string class?
a) operator+=()
b) operator[]()
c) push_back()
d) erase()
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14. Which function is used to get the length of a string object?
a) str.length()
b) str.size()
c) str.max_size()
d) both size() and length() function
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15. What is the identifier given to string class to declare string objects?
a) String
b) string
c) STRING
d) Any of the above can be used
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