String Interview Questions Mock Test

Question 1: C++ String Declaration

Which is the correct way to declare a string in C++ using the Standard Library?

Question 2: C++ Guess the Output – String Initialization

What will the following code print?

#include <iostream>
#include <string>
using namespace std;

int main() {
    string s = "Hello";
    cout << s;
    return 0;
}

Question 3: C++ String Length

Which function is used to get the length of a string in C++?

Question 4: C++ Guess the Output – String Concatenation

What will be the output of this code?

#include <iostream>
#include <string>
using namespace std;

int main() {
    string a = "Good";
    string b = "Morning";
    cout << a + " " + b;
    return 0;
}

Question 5: C++ Character Access

How can we access the 3rd character of a string s?

Question 6: C++ Guess the Output – String Substring

What will the following code print?

#include <iostream>
#include <string>
using namespace std;

int main() {
    string s = "Programming";
    cout << s.substr(0, 4);
    return 0;
}

Question 7: C++ String Comparison

Which operator can be used to compare two strings in C++?

Question 8: C++ Guess the Output – String Append

What will the output of the following code be?

#include <iostream>
#include <string>
using namespace std;

int main() {
    string s = "Code";
    s.append("Lab");
    cout << s;
    return 0;
}

Question 9: C++ String to C-Style String

Which function is used to convert a C++ string to a C-style character array?

Question 10: C++ Guess the Output – String Replace

What will this code print?

#include <iostream>
#include <string>
using namespace std;

int main() {
    string s = "HelloWorld";
    s.replace(5, 5, " C++");
    cout << s;
    return 0;
}