CODEWITHSUNDEEP
java
Tando
Tando

Reputation: 1

How do I calculate factorial and show working?

Hey I am really new to java and need a little help with this please.

I have some basic code that works fine it calculates the factor of a number lets say 5 and it gives the output answer of in this case "Factorial = 120.00"

That's great but I want it to give me the output like this "5 * 4 * 3 * 2 * 1 = 120.00" but I just can't figure out how to do it.

Thanks for any help

public static void main(String[] args)
{
Scanner kboard = new Scanner(System.in);

int nos1=0;
int total=1;
DecimalFormat df = new DecimalFormat("#.00");

System.out.print("Please enter number to factor ");
nos1 = kboard.nextInt();

for (int x=1;x<=nos1;x++)
{
total = total *x;   
}
System.out.println("Factorial = "+df.format(total));
}

Upvotes: 0

Views: 181

Answers (2)

sunleo
sunleo

Reputation: 10947

String s = "";
for (int x = nos1; x >= 1; x--) {
    total = total * x;
    // print here it will work
    if(!s.isEmpty())
        s+="*";
    s += x;
}
System.out.println(s + "=" + df.format(total));

Upvotes: 1

Sam I am says Reinstate Monica
Sam I am says Reinstate Monica

Reputation: 31184

This will only get you part of the way there.

this code will print

1 * 2 * 3 * 4 * 5 * = 120

for (int x=1;x<=nos1;x++)
{
    System.out.print(x + " * ");
    total = total *x;   
}
System.out.println(" = " + df.format(total));

I'll let you figure out a way to print it in the order you want and get rid of the last * at the end. there are a few ways.

Upvotes: 1

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