C++ Coding Practice - JinMing Lab

Definition first

What C++ means

C++ is a programming language for writing exact instructions, often used for performance systems algorithms and contests. Start with one mental model: input goes through steps and becomes output.

Minimum run factsFile main.cppRun g++ main.cpp -std=c++17 && ./a.outHabit Trace memory values indexes and container state before compiling

Program

An ordered set of instructions. It reads input, follows rules, and produces output.

Value and variable

A value is data. A variable is the name you use to hold and reuse that data.

Function

A named piece of work. It takes input, does one job, and can return a result.

Runtime

C++17 compiler is the place that actually runs code from main.cpp.

First readable code

Input output

cin cout headers namespace

#include <iostream>
using namespace std;
int main() {
  cout << 42;
}

Output 42

Language lineage

C++ family tree

See where C++ comes from, which languages feel close, and what to learn next.

roots

CSimulaAlgol

currentC++C systems family

relatives

C Rust Java C Sharp

familyC systems family

best used for

performance, memory, algorithms, engines, and systems foundations

learn next

C Rust Go

Zero base path

1Read one rule2Predict output3Type from memory4Run checklist5Repeat with one change

Question bank

Search before practice

Pick a stage or search across the open programming bank. Jump straight to the matching drill.

18 matching questions

Search programming questions

Q 1ChoiceStage 1 definitions

C++ practice 1

C++ question 1. Choose the statement that matches output stream.

Q 2ChoiceStage 1 definitions

C++ practice 2

C++ question 2. Choose the statement that matches integer type.

Q 3ChoiceStage 1 definitions

C++ practice 3

C++ question 3. Choose the statement that matches vector push.

Q 4ChoiceStage 1 definitions

C++ practice 4

C++ question 4. Choose the statement that matches reference.

Q 5ChoiceStage 1 definitions

C++ practice 5

C++ question 5. Choose the statement that matches output stream.

Q 6ChoiceStage 1 definitions

C++ practice 6

C++ question 6. Choose the statement that matches integer type.

Q 7ChoiceStage 1 definitions

C++ practice 7

C++ question 7. Choose the statement that matches vector push.

Q 8ChoiceStage 1 definitions

C++ practice 8

C++ question 8. Choose the statement that matches reference.

Q 9ChoiceStage 1 definitions

C++ practice 9

C++ question 9. Choose the statement that matches output stream.

Q 10ChoiceStage 1 definitions

C++ practice 10

C++ question 10. Choose the statement that matches integer type.

Q 11ChoiceStage 1 definitions

C++ practice 11

C++ question 11. Choose the statement that matches vector push.

Q 12ChoiceStage 1 definitions

C++ practice 12

C++ question 12. Choose the statement that matches reference.

Q 13ChoiceStage 1 definitions

C++ practice 13

C++ question 13. Choose the statement that matches output stream.

Q 14ChoiceStage 1 definitions

C++ practice 14

C++ question 14. Choose the statement that matches integer type.

Q 15ChoiceStage 1 definitions

C++ practice 15

C++ question 15. Choose the statement that matches vector push.

Q 16ChoiceStage 1 definitions

C++ practice 16

C++ question 16. Choose the statement that matches reference.

Q 17ChoiceStage 1 definitions

C++ practice 17

C++ question 17. Choose the statement that matches output stream.

Q 18ChoiceStage 1 definitions

C++ practice 18

C++ question 18. Choose the statement that matches integer type.

Multiple choice

C++ practice 1

Q 1Choicenew

Question

C++ question 1. Choose the statement that matches output stream.

cout << 42;

Reference

Patterns for main.cpp

C++17 compilerg++ main.cpp -std=c++17 && ./a.out

Recall from memoryRead a small point then write it back without looking

Trace the codeWrite variable values line by line before you run the answer

Type it yourselfCopy less type more and fix one small error at a time

cin cout headers namespace

Input output

#include <iostream>
using namespace std;
int main() {
  cout << 42;
}

Include the right headers
Use cout for output
Return from main

int double bool string vector

Types

int score = 40 + 2;
cout << score;

Choose the right type
Watch integer division
Initialize variables

vector map set queue stack

STL

vector<int> v = {1, 2, 3};
cout << v.size();

Know the container behavior
Use size for count
Trace push pop operations

Definition first

What C++ means

C++ is a programming language for writing exact instructions, often used for performance systems algorithms and contests. Start with one mental model: input goes through steps and becomes output.

Minimum run factsFile main.cppRun g++ main.cpp -std=c++17 && ./a.outHabit Trace memory values indexes and container state before compiling

Program

An ordered set of instructions. It reads input, follows rules, and produces output.

Value and variable

A value is data. A variable is the name you use to hold and reuse that data.

Function

A named piece of work. It takes input, does one job, and can return a result.

Runtime

C++17 compiler is the place that actually runs code from main.cpp.

First readable code

Input output

cin cout headers namespace

#include <iostream>
using namespace std;
int main() {
  cout << 42;
}

Output 42

Language lineage

C++ family tree

See where C++ comes from, which languages feel close, and what to learn next.

roots

CSimulaAlgol

currentC++C systems family

relatives

C Rust Java C Sharp

familyC systems family

best used for

performance, memory, algorithms, engines, and systems foundations

learn next

C Rust Go

Zero base path

1Read one rule2Predict output3Type from memory4Run checklist5Repeat with one change

Question bank

Search before practice

Pick a stage or search across the open programming bank. Jump straight to the matching drill.

18 matching questions

Search programming questions

Q 1ChoiceStage 1 definitions

C++ practice 1

C++ question 1. Choose the statement that matches output stream.

Q 2ChoiceStage 1 definitions

C++ practice 2

C++ question 2. Choose the statement that matches integer type.

Q 3ChoiceStage 1 definitions

C++ practice 3

C++ question 3. Choose the statement that matches vector push.

Q 4ChoiceStage 1 definitions

C++ practice 4

C++ question 4. Choose the statement that matches reference.

Q 5ChoiceStage 1 definitions

C++ practice 5

C++ question 5. Choose the statement that matches output stream.

Q 6ChoiceStage 1 definitions

C++ practice 6

C++ question 6. Choose the statement that matches integer type.

Q 7ChoiceStage 1 definitions

C++ practice 7

C++ question 7. Choose the statement that matches vector push.

Q 8ChoiceStage 1 definitions

C++ practice 8

C++ question 8. Choose the statement that matches reference.

Q 9ChoiceStage 1 definitions

C++ practice 9

C++ question 9. Choose the statement that matches output stream.

Q 10ChoiceStage 1 definitions

C++ practice 10

C++ question 10. Choose the statement that matches integer type.

Q 11ChoiceStage 1 definitions

C++ practice 11

C++ question 11. Choose the statement that matches vector push.

Q 12ChoiceStage 1 definitions

C++ practice 12

C++ question 12. Choose the statement that matches reference.

Q 13ChoiceStage 1 definitions

C++ practice 13

C++ question 13. Choose the statement that matches output stream.

Q 14ChoiceStage 1 definitions

C++ practice 14

C++ question 14. Choose the statement that matches integer type.

Q 15ChoiceStage 1 definitions

C++ practice 15

C++ question 15. Choose the statement that matches vector push.

Q 16ChoiceStage 1 definitions

C++ practice 16

C++ question 16. Choose the statement that matches reference.

Q 17ChoiceStage 1 definitions

C++ practice 17

C++ question 17. Choose the statement that matches output stream.

Q 18ChoiceStage 1 definitions

C++ practice 18

C++ question 18. Choose the statement that matches integer type.

Multiple choice

C++ practice 1

Q 1Choicenew

Question

C++ question 1. Choose the statement that matches output stream.

cout << 42;

Reference

Patterns for main.cpp

C++17 compilerg++ main.cpp -std=c++17 && ./a.out

Recall from memoryRead a small point then write it back without looking

Trace the codeWrite variable values line by line before you run the answer

Type it yourselfCopy less type more and fix one small error at a time

cin cout headers namespace

Input output

#include <iostream>
using namespace std;
int main() {
  cout << 42;
}

Include the right headers
Use cout for output
Return from main

int double bool string vector

Types

int score = 40 + 2;
cout << score;

Choose the right type
Watch integer division
Initialize variables

vector map set queue stack

STL

vector<int> v = {1, 2, 3};
cout << v.size();

Know the container behavior
Use size for count
Trace push pop operations