找素数
package package1;
import java.util.Scanner;
public class zhaosushu {
public static void main(String[] args) {
System.out.println("输入1个数");
Scanner A=new Scanner(System.in);
int a=A.nextInt();
int i;
for(i=2;i
{
if(a%i==0){System.out.println("素数");break;}
}
System.out.println("无判断则为非素数");
}
}
数组排序
package package1;
import java.io.*;
import java.lang.reflect.Array;
import java.util.*;
public class shuzupaixu {
public static void main(String[] args) throws NumberFormatException, IOException {
int i,j,n;
System.out.println("输入数组个数:");
Scanner sc = new Scanner(System.in);
n=sc.nextInt();
int []A = new int [n];
System.out.println("输入数组:");
Scanner a = new Scanner(System.in);
for(i=0;i A[i]=a.nextInt();
for(i=0;i {
for(j=i+1;j if(A[i]>A[j])
{
int t = A[i];
A[i] = A[j];
A[j] = t;
}
}
System.out.println("The sorted numbers:");
for(i=0;i System.out.print(A[i]+" ");
}
}
比较
package package1;
import java.util.Scanner;
public class bijiao {
public static void main(String[] args) {
System.out.println("输入4个数");
double a,b,c,d,t,m,n,h,g,l;
Scanner A=new Scanner(System.in);
a=A.nextDouble();
Scanner B=new Scanner(System.in);
b=B.nextDouble();
Scanner C=new Scanner(System.in);
c=C.nextDouble();
Scanner D=new Scanner(System.in);
d=D.nextDouble();
if(a>b){t=a;a=b;b=t;}
if(a>c){m=a;a=c;c=m;}
if(a>d){n=a;a=d;d=n;}
if(b>c){h=b;b=c;c=h;}
if(b>d){g=b;b=d;d=g;}
if(c>d){l=c;c=d;d=l;}
System.out.println("a="+a+"b="+b+"c="+c+"d="+d);
}
}
求和
package package1;
public class addclass {
private double sum;
addclass(double x,double y)
{
sum=x+y;
}
addclass(double x,double y,double z)
{
sum=x+y+z;
}
addclass(double x,double y,double z,double w)
{
sum=x+y+z+w;
}
public void pt()
{
System.out.println("sum= "+sum);
}
}
找中间值
package package1;
import java.util.*;
public class findPrime {
public static void main(String[] args) {
int num, i, j, k = 0;
int []A = new int [5];
System.out.println("pleas input the numbers");
Scanner sc = new Scanner(System.in);
for(i=0;i A[i] = sc.nextInt();
for (i = 0; i num = A[i];
for (j = 2; j <= num; j++)
if (num % j == 0)
break;
if (num == j) {
System.out.print(num + " ");
k++;
if (k % 10 == 0)
System.out.println();
}
}
}
}
求面积
package package1;
public class qiuarea {
public static void main(String[] args){
Crrectangle reat1=new Crrectangle();
reat1.width=10;
reat1.
height=20;
System.out.println(reat1. area());
}
}