Learn VALA with Real Code Examples

int count = 0;
bool isDark = false;

void updateUI() {
    stdout.printf("Counter: %d\n", count);
    stdout.printf("Theme: %s\n", isDark ? "Dark" : "Light");
}

void increment() {
    count++;
    updateUI();
}

void decrement() {
    count--;
    updateUI();
}

void reset() {
    count = 0;
    updateUI();
}

void toggleTheme() {
    isDark = !isDark;
    updateUI();
}

// Simulate actions
updateUI();
increment();
increment();
toggleTheme();
decrement();
reset();

Demonstrates a simple counter with theme toggling using Vala variables and methods.

Random rng = new Random();
for (int i = 1; i <= 3; i++) {
    int num = rng.next_int() % 100 + 1;
    stdout.printf("Random %d: %d\n", i, num);
}

Generates random numbers between 1 and 100 and prints them.

List<string> todos = new List<string>();

void addTask(string task) {
    todos.add(task);
    stdout.printf("%s\n", string.Join(", ", todos));
}

void removeTask(int index) {
    todos.remove_at(index);
    stdout.printf("%s\n", string.Join(", ", todos));
}

// Simulate actions
addTask("Buy milk");
addTask("Write Vala code");
removeTask(0);

Maintains a simple todo list with add and remove functionality.

Random rng = new Random();
for (int i = 1; i <= 3; i++) {
    int roll = rng.next_int() % 6 + 1;
    stdout.printf("Roll %d: %d\n", i, roll);
}

Rolls a six-sided dice three times.

int count = 5;
while (count >= 0) {
    stdout.printf("Countdown: %d\n", count);
    count--;
}
stdout.printf("Done!\n");

Counts down from 5 to 0.

bool isPrime(int n) {
    if (n < 2) return false;
    for (int i = 2; i*i <= n; i++) {
        if (n % i == 0) return false;
    }
    return true;
}

int[] nums = {7, 10, 13};
foreach (int n in nums) {
    stdout.printf("%d is %s\n", n, isPrime(n) ? "Prime" : "Not Prime");
}

Checks if numbers are prime.

float cToF(float c) { return c*9/5 + 32; }
float fToC(float f) { return (f-32)*5/9; }
stdout.printf("25°C = %.1f°F\n", cToF(25));
stdout.printf("77°F = %.1f°C\n", fToC(77));

Converts Celsius to Fahrenheit and Fahrenheit to Celsius.

List<string> cart = new List<string>();
List<int> prices = new List<int>();

void addItem(string item, int price) {
    cart.add(item);
    prices.add(price);
    stdout.printf("Cart: %s\n", string.Join(", ", cart));
    stdout.printf("Total: %d\n", prices.sum());
}

void removeItem(int index) {
    cart.remove_at(index);
    prices.remove_at(index);
    stdout.printf("Cart: %s\n", string.Join(", ", cart));
    stdout.printf("Total: %d\n", prices.sum());
}

// Simulate actions
addItem("Apple", 2);
addItem("Banana", 3);
removeItem(0);

Adds and removes items in a shopping cart with total cost.

void greet(string name) {
    stdout.printf("Hello, %s! Welcome!\n", name);
}

// Simulate actions
greet("Saurav");
greet("Alice");
greet("Bob");

Greets users by name.

int time = 0;
while (time < 5) {
    stdout.printf("Stopwatch: %d seconds\n", time);
    time++;
}
stdout.printf("Done!\n");

Simulates a stopwatch incrementing seconds.