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funzioni/descrizione_numero.cpp

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+/*
+AUTORE: Manuel Vichi
+Descrizione di un numero
+*/
+#include <iostream>
+#include <cmath>
+#include <cstdlib>
+using namespace std;
+//Function to calculate the square of a number (because why not??)
+int square(int x) {
+	return x * x;
+}
+
+//Boolean function to determinate if a number is automorphic
+bool isAutomorphic(int num) {
+    int temp = num;
+    int digits = 0;
+    while (temp > 0) {
+        digits++;
+        temp /= 10;
+    }
+    int lastDigits = square(num) % static_cast<int>(pow(10, digits));
+    return lastDigits == num;
+}
+
+//Function to check if a number is prime
+bool isPrimeNumber(int num) {
+    if (num <= 1)
+		return false;
+    for (int i = 2; i * i <= num; i++) {
+        if (num % i == 0)
+			return false;
+    }
+    return true;
+}
+
+//Function to check if a number is perfect
+bool isPerfectNumber(int n) {
+    if (n <= 1)
+		return false;
+    int sum = 0;
+    for (int i = 1; i <= n / 2; ++i)
+        if (n % i == 0)
+            sum += i;
+    return sum == n;
+}
+
+//Function to reverse the number
+int reverseNumber(int number) {
+	int original = number;
+    int reversed = 0;
+    while (number > 0) {
+        int digit = number % 10;
+        reversed = reversed * 10 + digit;
+        n /= 10;
+    }
+    return reversed;
+}
+
+//Function to check if a number is palindrome
+bool isPalindrome(int n) {
+    int original = n;
+    int reversed = reverseNumber(n);
+    return original == reversed;
+}
+
+
+//Main function, asks in input the number and prints if it's automorphic or not
+int main() {
+	int numero;
+    cout << "Inserisci il numero: ";
+    cin >> numero;
+    cout << endl;
+    cout << "Il numero " << numero << " fornito in input ha le seguenti caratteristiche:" << endl;
+    if (isAutomorphic(numero))
+    	cout << "Il numero e' automorfo" << endl;
+    else
+    	cout << "Il numero non e' automorfo" << endl;
+    if (isPrimeNumber(numero))
+    	cout << "Il numero e' primo" << endl;
+    else
+    	cout << "Il numero non e' primo" << endl;
+    if (isPerfectNumber(numero))
+    	cout << "Il numero e' perfetto" << endl;
+    else
+    	cout << "Il numero non e' perfetto" << endl;
+    if (isPalindrome(numero))
+    	cout << "Il numero e' palindromo" << endl;
+    else
+    	cout << "Il numero non e' palindromo" << endl;
+    cout << endl; //Just to separate the output of the program
+    cout << "Il numero " << numero << " invertito e': " << reverseNumber(numero) << endl;
+    system("pause"); //Needed on Windows to display the console output if the executable is not runned from a console
+    return 0;
+}