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#include<iostream>
 
using namespace std;
 
void aa(int i){
 
	if(i==0 || i==1 ){
	int sum = 1 ;                                             /*    0!不見了  ?     */
	cout << i << "!= " << sum <<  endl ;
	}
	else{
 
	aa(i-1);        
	int sum = i*(i-1);                                        /*   else 這邊的算式我想不出來怎麼寫才對     */
 
	cout << i << "!= " << sum <<  endl ;
 
}
 
}
 
int main(){
	int a =5 ;
 
	aa(a);
 
 
}

Main.java:1: error: illegal character: '#'
#include<iostream>
^
Main.java:1: error: class, interface, or enum expected
#include<iostream>
        ^
Main.java:5: error: class, interface, or enum expected
void aa(int i){
^
Main.java:9: error: class, interface, or enum expected
	cout << i << "!= " << sum <<  endl ;
	^
Main.java:10: error: class, interface, or enum expected
	}
	^
Main.java:14: error: class, interface, or enum expected
	int sum = i*(i-1);                                        /*   else ???????????????     */
	^
Main.java:16: error: class, interface, or enum expected
	cout << i << "!= " << sum <<  endl ;
	^
Main.java:18: error: class, interface, or enum expected
}
^
Main.java:25: error: class, interface, or enum expected
	aa(a);
	^
Main.java:28: error: class, interface, or enum expected
}
^
10 errors

Standard output is empty