function.java

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<0) {y2=y2+f;}
return y2;
}
public int convertnum(int a){
        a=a+97;
        return a;

}
public int convertchar(char b){
        b=b-97;
            return b;
    }


}