rekursif #2

#include <iostream>
using namespace std;



float der(int,int);
int derx(int,int);

main(){

    cout<<der(5,1)<<endl;
    cout<<derx(5,1);

}


float der(int n,int c){
    char k;
    if(!n){

        return 0;
    }
    int x;
    if(n%4==0){
        x=1;
    }else{
        x= -1;
    }

        if(c%4==0){

            k='+';
        }
        else{
            k='-';
        }
    cout<<k<<1<<"/"<<(2*(c));
    if(n==1)
    cout<<endl<<"S: ";
    return 1/(2.0*n*x)+der(n-1,c+1);


}

int derx(int n,int c){

    int x;
    char y;
    if(!n){
     cout<<endl<<"S =";
    return 0;

}

    if(n%2==0){
        x=-1;
    }else{
        x= 1;
    }
    y= x==1 ? '\0': c%1==0 ? '+' : '-';
    cout<<x*(1+(c-1)*2)<<y;
    return x*(1+(n-1)*2)+derx(n-1,c+1);
}