What You’ll Gain
By the end of this post, you’ll:
- Revisit all major topics covered in the C++ series
- Strengthen your understanding with quick concept checks
- A 30 points quiz to test yourself
- Solve practical coding exercises
- Know what to revise before your exam or next course (e.g., Data Structures)
Part 1: Topic-by-Topic Revision
1. Basics & Syntax
main()
function is the entry point.- Use
#include
to include standard libraries. cout
andcin
for output and input.
Quick Check:
- Write a program that reads a number and prints it.
2. Variables & Data Types
- Use
int
,float
,double
,char
,bool
, andstring
. - Constants are declared with
const
.
Quick Check:
- Declare a
double
for temperature and abool
for status.
3. Control Flow
- Use
if
,else if
, andelse
to make decisions. - Combine conditions with
&&
,||
,!
.
Quick Check:
- Write a program that checks if a number is even or odd.
4. Loops
- Use
for
,while
, anddo-while
. - Use
break
andcontinue
to control loop flow.
Quick Check:
- Print numbers from 10 to 1 using a
for
loop.
5. Arrays & Vectors
- Arrays have fixed size:
int arr[5]
. - Vectors are dynamic:
vector<int> nums; nums.push_back(5);
Quick Check:
- Store 5 numbers in a vector and print the sum.
6. 2D Arrays
- Syntax:
int matrix[3][3];
- Use nested loops to access elements.
Quick Check:
- Input a 3×3 matrix and print its transpose.
7. Input / Output
- Use
cin
,cout
, and formatting from<iomanip>
. - Use
<fstream>
for reading/writing files.
Quick Check:
- Write 3 lines to a file, then read and print them.
8. Functions
- Use parameters, return values, and function overloading.
- Pass by value or reference.
Quick Check:
- Write a function
int max(int a, int b)
.
9. Memory & Pointers
- Stack vs Heap.
int* p = new int; delete p;
- Use
&
(address-of) and*
(dereference).
Quick Check:
- Write a function that swaps two values using pointers.
10. Recursion
- Use a base case to stop recursion.
- Useful for factorial, Fibonacci, etc.
Quick Check:
- Write a recursive function to compute
n!
.
11. Structures
- Group multiple variables into a custom type.
- Access members using the dot
.
operator.
Quick Check:
- Create a
Book
struct with title, author, and price.
12. Classes & Operator Overloading
- Use
class
for encapsulation. - Overload
+
,==
,<<
to improve readability.
Quick Check:
- Write a
Fraction
class and overload the+
operator.
Revision Test: C++ Basics
Question 1/7
Part 2: Practice Problems
Try solving these to test your complete understanding:
1. Student Records Manager
- Use a
struct Student
with name, roll number, GPA. - Input and store data for
n
students. - Display all students with GPA above 3.5.
2. Basic Calculator
- Create a function for each operation:
add
,subtract
,multiply
,divide
. - Ask the user to select an operation and two numbers.
- Display the result.
3. Matrix Operations
- Input two 2×2 matrices.
- Write functions to:
- Add matrices
- Multiply matrices
- Transpose a matrix
4. Mini Game – Number Guessing
- Generate a random number.
- Let the user guess until they get it right.
- Give hints: “too high” or “too low”.
5. Library System (Advanced)
- Use a
Book
class with title, author, copies. - Allow user to:
- Add books
- Search by title
- Borrow and return books
Part 3: Final Tips
- Practice writing full programs—not just snippets.
- Debug step-by-step and use output statements to track variable values.
- Focus on clear naming and code readability.
- Don’t memorize—understand how concepts connect.
- Use online judges like HackerRank, Codeforces, or LeetCode to practice.
Summary
This post helped you:
- Revisit each core C++ concept from this course
- Practice with quick checks and full problems
- Prepare yourself for coding interviews, data structures, or your final exam
Final Word
You’ve now completed the full C++ foundational course here on painlessprogramming.com. Whether you’re a university student or a self-learner, this knowledge gives you the confidence to tackle more advanced topics like:
- Data Structures and Algorithms
- Object-Oriented Design
- Competitive Programming
- Real-World Projects