【Java开源代码栏目提醒】:网学会员,鉴于大家对Java开源代码十分关注,论文会员在此为大家搜集整理了“Ch4_8.java”一文,供大家参考学习!
import java.util.Scanner;
public class Ch4_8
{
public static void main(String[] args)
{
int count=0;
int s=0;
int n;
int num=1000;
for(int i=4;i<=num;i=i+2)
{
for(n=2;n<=i/2;n++)
{
if((suShu(n))&&(suShu(i-n)))
{
// System.out.print(i+"="+n+"+"+(i-n)+" ");
System.out.printf("%3d=%2d+%3d ",i,n,(i-n));
count++;
s++;
break;
}
}
if(n==i/2+1)
System.out.print("error "+i);
if(count%5==0)
{
System.out.println();
count=0;
}
}
System.out.print("\n表达式个数:"+s);
}
public static boolean suShu(int n)
{
for(int i=2;i<=(int)(Math.sqrt((double)n));i++)
{
if(n%i==0)
return false;
}
return true;
}
}
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Ch4_7.java
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还记得,那年的风车吗?