Program to calculate Euler's Totient Function.

tests/eulers_totient.aer

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+// A simple C program to calculate Euler's Totient Function 
+class Program {
+
+	// Function to return gcd of a and b
+	private int gcd(int $a, int $b) {
+		if($a == 0)
+			return $b;
+		return $this->gcd($b % $a, $a);
+	}
+
+	// A simple method to evaluate Euler Totient Function
+	private int phi(int $n) {
+		int $result = 1;
+		for(int $i = 2; $i < $n; $i++)
+			if($this->gcd($i, $n) == 1)
+				$result++;
+		return $result;
+	}
+
+
+	// Driver program to test above function
+	public int main() {
+		int $n;
+		for($n = 1; $n <= 10; $n++)
+			printf("phi(%d) = %d\n", $n, $this->phi($n));
+		return 0;
+	}
+
+}

tests/eulers_totient.exp

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+phi(1) = 1
+phi(2) = 1
+phi(3) = 2
+phi(4) = 2
+phi(5) = 4
+phi(6) = 2
+phi(7) = 6
+phi(8) = 4
+phi(9) = 6
+phi(10) = 4