Format factoriel Java

Question

Ma méthode factorielle fonctionne correctement, bien que je souhaite changer la sortie en sortant simplement le nombre et le résultat factoriel. Par exemple, je voudrais si l'utilisateur entre 6 pour la sortie de dire 6 * 5 * 4 * 3 * 2 * 1 = 720, au lieu de factoriel de 6 est: 720.

int count, number;//declared count as loop and number as user input 
    int fact = 1;//declared as 1 
    Scanner reader = new Scanner(System.in); // Reading from System.in 
    System.out.println("Please enter a number above 0:"); 
    number = reader.nextInt(); // Scans the next token of the input as an int 
    System.out.println(number);//prints number the user input 
    if (number > 0) { 
     for (i = 1; i <= number; i++) {//loop 
      fact = fact * i; 
     } 
     System.out.println("Factorial of " + number + " is: " + fact); 
    } 
    else 
    { 
     System.out.println("Enter a number greater than 0"); 
    } 
} 

Answer 1

créer une chaîne et un magasin les nombres.

essayez quelque chose comme ceci.

int count, number;//declared count as loop and number as user input 
    String s; //create a string 
    Scanner reader = new Scanner(System.in); // Reading from System.in 
    System.out.println("Please enter a number above 0:"); 
    number = reader.nextInt(); // Scans the next token of the input as an int 
    int fact = number;//store the number retrieved 
    System.out.println(number);//prints number the user input 
    if (number > 0) { 
     s=String.valueOf(number); 
     for (int i = 1; i < number; i++) {//loop 
      fact = fact * i; 
      s = s +" * "+String.valueOf(number-i); 
     } 
     System.out.println(s+ " = " + fact); 
    } 
    else 
    { 
     System.out.println("Enter a number greater than 0"); 
    } 

Answer 2

Vérifiez cette approche récursive: (vérifier les nombres négatifs vous-même: D)

public static void main(String[] args) { 
    Scanner scanner = new Scanner(System.in); 
    int num = scanner.nextInt(); 
    System.out.println(getFactorialString(num, " = " + getFactorial(num))); 
} 

public static String getFactorialString(int num, String result) { 
    if (num == 0) return "0 => 1"; 
    if (num == 1) { 
     result = "" + num + "" + result; 
    } else { 
     result = getFactorialString(num - 1, result); 
     result = "" + num + " x " + result; 
    } 
    return result; 
} 

public static int getFactorial(int num) { 
    if (num == 0) return 1; 
    return num * getFactorial(num - 1); 
}