Beginning java

aminsky · January 5th, 2006, 07:22 AM

this is about 1!+2!+3!+...+n!=?
below is program code,it can run but there is out error.

public class Demo{
public static void main(String args[]){
double num=1,sum=0;
int n=0;
System.out.print("Please input a number:");
try{
n=integer.parInt(System.in.read());
}catct(IOException e){}
for(int i=1;i<=n;i++){
num=num*i;
sum=sum+num;
System.out.println(n+"result is:"+sum);
}
}
}
when it run,
if i input 4,
output is "53 result is:....",
why?

Knydig · January 12th, 2006, 08:20 AM

You misspelled alot of things in the code...

Code:

import java.util.*;

public class Demo{

    public static void main(String args[]){

        int num=1,sum=0;

            System.out.print("Please input a number:");
            Scanner in = new Scanner(System.in);
            int n = in.nextInt();


            for(int i=1;i<=n;i++){
                num=num*i;
                sum=sum+num;
            System.out.println(n+" result is:"+sum);

            }
    }
}

jetbrains · January 15th, 2006, 09:50 AM

Below code is very good and sample
Scanner in = new Scanner(System.in);
int n = in.nextInt();

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