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C++ Academy · Lesson

Branching: if-else, ternary, switch-case

Choose between if-else chains, ternary expressions, and switch statements for clear branching.

Branching: if-else, ternary, switch-case is a free C++ Academy lesson on CoddyKit — lesson 1 of 4. You can read the complete lesson below for free — then practise it hands-on in the browser with a built-in code editor and a 24/7 AI tutor. It is part of the C++ Academy learning path, one of 4 lessons in the course, and your progress syncs across the web and the CoddyKit app.

The if Statement

The basic conditional. The body executes when the condition is true. Curly braces are optional for a single statement but always recommended.

int score = 85;
if (score >= 60) {
    std::cout << "Pass\n";
}

if-else Chains

Test alternatives with else if and a final else. The first true branch runs.

if (score >= 90) std::cout << "A";
else if (score >= 80) std::cout << "B";
else if (score >= 70) std::cout << "C";
else std::cout << "F";

Boolean Conditions

Any expression convertible to bool works. Pointers test as false when null, and integers as false when zero. Be explicit for clarity.

Initializing in the if (C++17)

C++17 lets you declare a variable inside the if. The variable is scoped to the if-else body.

if (auto it = map.find(key); it != map.end()) {
    std::cout << it->second;
}

The Ternary Operator

condition ? a : b returns one of two values. Great for simple choices, terrible for nested logic.

int max = (a > b) ? a : b;
std::string msg = (n == 1) ? "item" : "items";

Nested Ternaries: Avoid

Nested ternaries are hard to read. Use if-else or refactor into a helper function instead.

// Hard to read
auto label = (n < 0) ? "neg" : (n == 0) ? "zero" : "pos";

// Clearer
std::string label;
if (n < 0) label = "neg";
else if (n == 0) label = "zero";
else label = "pos";

The switch Statement

Compare one value against several constants. Each branch needs break to avoid falling through to the next case.

switch (day) {
    case 1: std::cout << "Mon"; break;
    case 2: std::cout << "Tue"; break;
    default: std::cout << "?";  break;
}

Intentional Fallthrough

Group multiple cases that share code. C++17 added [[fallthrough]] as a marker for the compiler.

switch (c) {
    case 'a': case 'e': case 'i': case 'o': case 'u':
        std::cout << "vowel"; break;
    default:
        std::cout << "consonant";
}

switch Constraints

switch works only on integer and enum types. For strings, use if-else or a hash map.

Initializer in switch (C++17)

Similar to if, you can declare a variable inside the switch header.

switch (auto value = compute(); value) {
    case 0: ...
    default: ...
}

Pattern: Lookup Map

For string-keyed branches, a std::unordered_map can be cleaner than an if-else chain.

std::unordered_map<std::string, std::function<void()>> commands = {
    {"start", []{ start(); }},
    {"stop",  []{ stop();  }}
};
if (auto it = commands.find(cmd); it != commands.end())
    it->second();

Quick Check

What happens if a case in a switch lacks a break and the next case is non-empty?

Recap

Use if-else for general branching, the ternary operator for short value choices, and switch when comparing one value against many integer constants. C++17 init-statements clean up scoping.

Frequently asked questions

Is the “Branching: if-else, ternary, switch-case” lesson free?

Yes — the full text of “Branching: if-else, ternary, switch-case” is free to read here on the web, and the C++ Academy course includes 4 lessons in total. To practise it interactively (a built-in code editor and a 24/7 AI tutor) and unlock the rest of the C++ Academy course, upgrade to CoddyKit PRO.

What will I learn in “Branching: if-else, ternary, switch-case”?

Choose between if-else chains, ternary expressions, and switch statements for clear branching. You practise C++ Academy with hands-on code you run directly in the browser, and a 24/7 AI tutor answers your questions as you work through the lesson.

Do I need any experience to start C++ Academy?

No prior experience is required. C++ Academy on CoddyKit is structured for beginners through advanced learners; this is — lesson 1 of 4, so you can start here or from the beginning and move at your own pace.

How long does the “Branching: if-else, ternary, switch-case” lesson take?

Most CoddyKit lessons take about 5–10 minutes. Each one is bite-sized and interactive, so you make steady progress and pick up exactly where you left off across the web and the app.

Can I write and run code in this C++ Academy lesson?

Yes. Every C++ Academy lesson includes a built-in code editor, so you write and run real code right in your browser and get instant AI feedback — no local setup required.

All lessons in this course

  1. Branching: if-else, ternary, switch-case
  2. Loop Patterns: for, while, do-while
  3. Range-Based for Loop with Containers
  4. Early Returns break continue and goto
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