歌德巴赫猜想的C语言和Java语言版源程序(给出任何一个大于6的偶数写出两个素数之和）

C语言版

#include<stdio.h>
int isPrime(int n)
{
	int j,x;
	for(j=2;j<n;j++)
	if(n%j==0)	
	{
		x=0;
		break;
	}else
	x=1;
	return x;
}
int main()
{
	int n,i;
	printf("Please input a even number(>6):");
	scanf("%d",&n);
	while(n<6||n%2!=0)
	{
		printf("Bad number!Please input again:");
		scanf("%d",&n);
	}
	for(i=3;i<(n/2);i++)
	{
		if(isPrime(i)!=0&&isPrime(n-i)!=0)
		printf("%d=%d+%d\n",n,i,n-i);
	}
}

Java语言版

import java.util.Scanner;

public class Prime {
	public int n,i;
	public int isPrime(int n) {
		int j, x = 0;
		for (j = 2; j < n; j++)
			if (n % j == 0) {
				x = 0;
				break;
			} else
				x = 1;
		return x;
	}

	public static void main(String[] args) {
		
		Prime num =new Prime();
		System.out.printf("Please input a even number(>6):");
		Scanner input1 = new Scanner(System.in);
		int n = input1.nextInt();
		while (n < 6 || n % 2 != 0) {
			System.out.printf("Bad number!Please input again:");
			n = input1.nextInt();
		}
		for (int i = 3; i < (n / 2); i++) {
			if (num.isPrime(i)!= 0 && num.isPrime(n - i) != 0)
				System.out.println(n + "=" + i + "+" + (n - i));
		}
	}
}