ProgramGuru

Store Student Names

Store Student Names

Std::string owns a sequence of characters and supports copying, comparison and concatenation.

Combine a student name with a report label without handling a manual character buffer.

Before this lesson, review Make Evaluation Clear when needed.

What you’ll learn

  • Use strings to store Student Names.
  • Explain how the complete example produces Diya passed.
  • Make the practice change and explain why the result changes or stays the same.

Follow a complete C++ example

Combine a student name with a report label without handling a manual character buffer.

Read the declarations above main before tracing its statements. Each declared name supplies the value, type or operation used later. The std:: prefix selects a name from the standard library, and cout << sends a value to the output stream.

C++17 · main.cpp · complete program

#include <iostream>
#include <string>

int main()  {
  std::string name = "Diya";
  std::cout << name + " passed" << '\n';
  return 0;
}

Expected output

Diya passed
Run in C++ compiler →

Connect the code to its result

C++17 · source used in this explanation

#include <iostream>
#include <string>

int main()  {
  std::string name = "Diya";
  std::cout << name + " passed" << '\n';
  return 0;
}

Expected output

Diya passed

Std::string owns a sequence of characters and supports copying, comparison and concatenation. Combine a student name with a report label without handling a manual character buffer.

Trace the result: Read the complete program below from its starting values to the output operations. Each std::cout statement displays the value supplied at that point; \n begins the next line. The resulting lines, in order, are Diya passed. In this example, distinguish what the program calculates or changes from what it actually displays.

Important mistakes and boundaries

String positions and size count char elements, not necessarily human-visible Unicode characters. C-style string literals and std::string have different ownership behavior.

Change the school example

C++17 · edit this complete example

#include <iostream>
#include <string>

int main()  {
  std::string name = "Diya";
  std::cout << name + " passed" << '\n';
  return 0;
}

Your task: Replace Diya with Saira. Before running your edited program, predict the new output and explain which stored value, condition or object changes. Keep the rest of the example intact.

Use the complete source repeated here; this task does not depend on remembering code from another section.

Worked answer and reasoning

Worked variation: Replace Diya with Saira. The report becomes Saira passed.

Std::string owns a sequence of characters and supports copying, comparison and concatenation. Combine a student name with a report label without handling a manual character buffer.

String positions and size count char elements, not necessarily human-visible Unicode characters. C-style string literals and std::string have different ownership behavior.

For a baseline run, save this source as main.cpp and use clang++ -std=c++17 -Wall -Wextra -pedantic main.cpp -o school, or equivalent g++ flags. Recompile after editing so that you run the updated executable.

The source and output below belong to the edited program. Compare them with the original example to see the consequence of this single change.

C++17 · worked variation · complete program

#include <iostream>
#include <string>

int main()  {
  std::string name = "Saira";
  std::cout << name + " passed" << '\n';
  return 0;
}

Expected output

Saira passed
Run in C++ compiler →

Check your understanding

C++17 · original program for this question

#include <iostream>
#include <string>

int main()  {
  std::string name = "Diya";
  std::cout << name + " passed" << '\n';
  return 0;
}
Before making the practice edit, what does the original C++17 program print?
Choose one answer. You can try again.

Answer and explanation

Diya passed

Std::string owns a sequence of characters and supports copying, comparison and concatenation. Combine a student name with a report label without handling a manual character buffer. String positions and size count char elements, not necessarily human-visible Unicode characters. C-style string literals and std::string have different ownership behavior.

What to remember

Std::string owns a sequence of characters and supports copying, comparison and concatenation. String positions and size count char elements, not necessarily human-visible Unicode characters. C-style string literals and std::string have different ownership behavior.

Useful connections: Make Evaluation Clear, Give a Task a Name.

Language and design guidance: C++ Core Guidelines and C++ working draft. The draft describes an evolving language; these examples deliberately target C++17.

Reaching the recap and completing the quizzes are separate milestones.

    Next lesson: Choose Between Outcomes →