مشاهده نسخه کامل
: mojibk
07-05-2009, 23:40
لام دوستان من یک برنامه نوشته ام که در ان شما یک عدد مثبت اعداد اولی که که در ان عدد می سود با هم خمع کرد را نمایش می دهد اما با مشکل مواجه شده است اگر از دوستان می تواند ای مشکل را حل کند به من کمک کنید
#include<stdio.h>
#include<conio.h>
#include<math.h>
int IsPrime(int); //returns 1 if prime. returns 0 if not prime.
void main()
{
int i,r,num;
clrscr();
printf ("__________________________________________________ ___________\n");
printf (" This program will calculate all possible combination of two\n prime numbers which produce a given even number. \n");
printf ("__________________________________________________ ___________\n");
printf ("\nPlease input an even number: ");
scanf ("%d",&num); // Getting a number from the user.
if (num%2 != 0) // Checking if the given number is even or not.
{
printf("\n%d is not an even number",num);
getch();
return; //Exit the program.
}
//---------- Start -----------//
/*
This program uses just one 'For' statement
as we know 'A+(B-A)=B' so if 'A' AND '(B-A)'
are prime numbers, they are the answer.
*/
for (i=2;i<=(num/2);i++)
{
if ( IsPrime(i) && IsPrime(num-i) )
{ // If BOTH of them are prime, Show them.
printf ("\n %4d + %4d = %d ",i,(num-i),num);
}
}
printf("\n\n Thanks for using this program.\n Morteza Zafari\n 2001");
getch();
}
//---------- End -----------//
IsPrime(int num)
{
int i;
if (num==1) return(0); //If it's 1, it's not prime.
if (num==2) return(1); //If it's 2, it's prime.
if (num%2==0) return(0); //If it is even then sure it's not prime.
else
{
for (i=2;i<=sqrt(num);i++)
{
if ( (num%i) == 0 ) return(0);
}
return(1);
}
}
با تشکر
#include<stdio.h>
#include<conio.h>
#include<math.h>
int IsPrime(int); //returns 1 if prime. returns 0 if not prime.
void main()
{
int i,r,num;
clrscr();
printf ("__________________________________________________ ___________\n");
printf (" This program will calculate all possible combination of two\n prime numbers which produce a given even number. \n");
printf ("__________________________________________________ ___________\n");
printf ("\nPlease input an even number: ");
scanf ("%d",&num); // Getting a number from the user.
if (num%2 != 0) // Checking if the given number is even or not.
{
printf("\n%d is not an even number",num);
getch();
return; //Exit the program.
}
//---------- Start -----------//
/*
This program uses just one 'For' statement
as we know 'A+(B-A)=B' so if 'A' AND '(B-A)'
are prime numbers, they are the answer.
*/
for (i=2;i<=(num/2);i++)
{
if ( IsPrime(i) && IsPrime(num-i) )
{ // If BOTH of them are prime, Show them.
printf ("\n %4d + %4d = %d ",i,(num-i),num);
}
}
printf("\n\n Thanks for using this program.\n Morteza Zafari\n 2001");
getch();
}
//---------- End -----------//
IsPrime(int num)
{
int i;
if (num==1) return(0); //If it's 1, it's not prime.
if (num==2) return(1); //If it's 2, it's prime.
if (num%2==0) return(0); //If it is even then sure it's not prime.
else
{
for (i=2;i<=sqrt(num);i++)
{
if ( (num%i) == 0 ) return(0);
}
return(1);
}
}
با تشکر