对数的操作 开始我的JAVA历程

package Text;public class Sumn {public static void main (String args[]){System.out.println("整数和");Sum S=new Sum();S.prient();System.out.println("偶数和");sum1 s1=new sum1();s1.prient();System.out.println("N!");sum2 s2=new sum2();s2.prient();System.out.println("Fibonacci数列的前N项");sum3 s3=new sum3();s3.prient();}}package Text;public class Sum {public int sum(int n){ int x=0;for(int i=1;i<=n;i++){x=x+i;}int s=x;return s;} public void prient(){System.out.println(sum(100));}}package Text;public class sum2 {public int sum(int n){ int x=1;for(int i=1;i<=n;i++){x=x*i;}int s=x;return s;} public void prient(){System.out.println(sum(10));}}package Text;public class sum3 {int [] intfib=new int[20];public void prient(){int i;int n= 20;for(i=1;i<=n;i++){if(i==1)intfib[0]=1;else if(i==2)intfib[1]=1;else intfib[i-1]=intfib[i-2]+intfib[i-3];System.out.print(intfib[i-1]+"  ");}}}package Text;public class sum1 {public int sum(int n){ int x=0;for(int i=2;i<=n;i+=2){x=x+i;}int s=x;return s;} public void prient(){System.out.println(sum(100));}}

1楼sxhelijian昨天 16:07

不写注释，不职业