C++ Questions and Answers - String Characters

This section on C++ questions and puzzles focuses on “String Characters”. One shall practice these questions and puzzles to improve their C++ programming skills needed for various interviews (campus interviews, walkin interviews, company interviews), placements, entrance exams and other competitive exams. These programming puzzles can be attempted by anyone focusing on learning C++ programming language. They can be a beginner, fresher, engineering graduate or an experienced IT professional. Our C++ questions come with detailed explanation of the answers which helps in better understanding of C++ concepts.

Here is a listing of C++ questions and puzzles on “String Characters” along with answers, explanations and/or solutions:

1. Which is an instantiation of the basic_string class template?
a) Character
b) String class
c) Memory
d) Iterator
View Answer

Answer: b
Explanation: The string class is an instantiation of the basic_string class template.

2. Which character is used to terminate the string?
a) $
b) Null
c) Empty
d) @
View Answer

Answer: b
Explanation: A string of characters is stored in successive elements of a character array are terminated by the NULL character.

3. How does the strings are stored in the memory?
a) Contiguous
b) Non-contiguous
c) Null
d) sequence
View Answer

Answer: a
Explanation: The characters of a string are stored contiguously in the memory.

4. What will be the output of the following C++ code?

```
    #include <iostream>
```
```
    #include <string>
```
```
    using namespace std;
```
```
    int main ()
```
```
    {
```
```
        string str;
```
```
        string str2="Steve jobs";
```
```
        string str3="He founded apple";
```
```
        str.append(str2);
```
```
        str.append(str3, 6, 3);
```

        str.append(str3.begin() + 6, str3.end());

```
        str.append(5,0x2e);
```
```
        cout << str << '\n';
```
```
        return 0;
```
```
    }
```

a) Steve jobs
b) He founded apple
c) Steve
d) Steve jobsndended apple…..
View Answer

Answer: d
Explanation: In this program, We are adding characters to the string, So the output will as follows after addition of characters.
Output:

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$ g++ str.cpp
$ a.out
Steve jobsndended apple.....

5. What will be the output of the following C++ code?

```
    #include <iostream>
```
```
    #include <string>
```
```
    using namespace std;
```
```
    int main ()
```
```
    {
```
```
        string str ("Test string");
```

        for ( string :: iterator it = str.begin(); it != 5; ++it)

```
            cout << *it;
```
```
        return 0;
```
```
    }
```

a) Test
b) string
c) Test string
d) Error
View Answer

Answer: d
Explanation: In the for loop, We are not allowed to give a numeric value in string, So it is arising an error.

6. What will be the output of the following C++ code?

```
    #include <iostream>
```
```
    #include <string>
```
```
    using namespace std;
```
```
    int main ()
```
```
    {
```
```
        string name ("Jobs");
```
```
        string family ("Steve");
```
```
        name += " Apple ";
```
```
        name += family;
```
```
        name += '\n';
```
```
        cout << name;
```
```
        return 0;
```
```
    }
```

a) Steve Jobs
b) Apple
c) Jobs Apple Steve
d) Apple Steve
View Answer

Answer: c
Explanation: In this program, We are adding the characters at the end of the current value.
Output:

$ g++ str1.cpp
$ a.out
Jobs Apple Steve

7. What will be the output of the following C++ code?

```
    #include <iostream>
```
```
    #include <string>
```
```
    using namespace std;
```
```
    int main ()
```
```
    {
```

        string str="Steve Jobs founded the apple";

        string str2 = str.substr (6, 4);

```
        unsigned pos = str.find("the");
```
```
        string str3 = str.substr (pos);
```

        cout << str2 << ' ' << str3 << '\n';

```
        return 0;
```
```
    }
```

a) Jobs the apple
b) the apple
c) Steve
d) Jobs
View Answer

Answer: a
Explanation: In this program, We are finding the substring of the string by using the substr function.
Output:

$ g++ str2.cpp
$ a.out
Jobs the apple

8. What will be the output of the following C++ code?

```
    #include <iostream>
```
```
    #include <string>
```
```
    using namespace std;
```
```
    int main ()
```
```
    {
```
```
        string str ("Steve jobs");
```
```
        cout << str.length();
```
```
        return 0;
```
```
    }
```

a) 8
b) 10
c) 12
d) 9
View Answer

Answer: b
Explanation: In this program, We are finding the length of the string.
Output:

$ g++ str3.cpp
$ a.out
10

9. Where are the strings stored?
a) Stack
b) Heap
c) Both Stack & Heap
d) Queue
View Answer

Answer: c
Explanation: Dynamic strings(dynamic length) are stored in heap and static string(with fixed size) are stored in stack.

10. What will happen if a string is empty?
a) It can’t be created
b) Raises an error
c) It can be used
d) It cannot be used
View Answer

Answer: c
Explanation: An empty string is a character array with the NULL character in the zeroth index position.

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