Help me with java programs for computing and printing prime numbers/factorial of a no

[nyadimo]

1.write a program which computes and prints prime numbers

2. write a program which computes and prints the factorial of a number

 

[ieropsaltic]

Re: java programming

to calculate factorial ;

public class P1
{
public static void main(String[] args)
{
int num=5;//the number required to calc its factorial .
int res=1;
for(int i=1;i<=num;i++)
res*=i;<
System.out.println(res);
}
}
to get prime numbers :

public class P2
{
public static void main(String[] args)
{
for(int i=1;i<=50;i++) //50 can be replaced by max num to calc to .
{
int x=2;
while((i%x)!=0 && x<50)
x++;

if (x==i)
System.out.println(i);
}
}
}


note : I haven't tried these codes so they may contain some bugs .

 

[jinics]

java programming

Are we doing people's homework here ?

 

[zhi_yi]

Re: java programming

For prime, odd, and even numbers.. I hope I am not doing people's homework.

class prima{
public static void main(String args[])
throws java.io.IOException{
utama();
}

public static void utama()
throws java.io.IOException{
int pil;
System.out.println("Pilihlah salah satu dari pilihan di bawah ini ");
System.out.println("1. Tampilin bilangan prima");
System.out.println("2. Tampilin bilangan ganjil");
System.out.println("3. Tampilin bilangan genap");
System.out.print("Masukkan pilihan anda: ");
do{
pil = (int) System.in.read();
}while(pil < '1' || pil > '5');
switch(pil){
case '1': prima1(); break;
case '2': ganjil(); break;
case '3': genap(); break;
default:
}
}

private static void prima1()
throws java.io.IOException{
System.out.println("\n \nbilangan prima diantara 1 sampai 100 yaitu:");
for(int i = 1;i<=100;i++){
int k=0;
for(int j=1;j<=i;j++){
if(i%j==0) k++;
}
if(k==2) System.out.print(i+ " ");
}
}
private static void ganjil(){
System.out.println("\n \nbilangan ganjil diantara 1 sampai 100 yaitu: ");
for(int i = 2;i<=100;i+=2)
System.out.print(i-1+" ");
System.out.println();
}
private static void genap(){
System.out.println("\n\nbilangan genap diantara 1 sampai 100 yaitu: ");
for(int i = 2;i<=100;i+=2)
System.out.print(i + " ");
System.out.println();
}
}

 

[Beeblebrox]

Re: java programming

Dear nyadimo,

did you try to use GOOGLE? Google is an internet index and search engine. Very useful
And sorry for the sarcasm...