c.java

用java写的

package oop;

public class C {
public static void main(String args[]){
	double i=2,ii=3,iii;
	double j=1,jj=2, jjj;
	double sum=2/1+3/2;
	for(int count=3;count<=20;count++){
	iii=i+ii;
	jjj=j+jj;
	sum=sum+jjj/iii;
	i=ii;ii=iii;
	j=jj;jj=jjj;
	}
	System.out.println(sum);
}

}