放射密码java实现

				import java.io.*;				public class function {				public int function (int d,int f ){				    int x1=1,x2=0,y1=0,y2=1,x3=f,y3=d,q=0;				    int t1,t2,t3,temp;				    for(; ;){				            temp=x3;				            if (y3==0) {y2=NULL;System.out.println("无逆元");break;}				            if (y3==1) break;				            while(x3>=y3){				            q++;				            x3=x3-y3;				            }				            x3=temp;				    t1=x1-q*y1;t2=x2-q*y2;t3=x3-q*y3;				    x1=y1;x2=y2;x3=y3;				    y1=t1;y2=t2;y3=t3;				    q=0;				    }				    if (y2>0) {y2=y2%f;}				    if (y2				return y2;				}								}