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));
}
}
}