#include<iostream>
using namespace std;
void fun(int k)
{
if(k>0)
fun(k-1);
cout<<k;
}
int main()
{
int w=5;
fun(w);
cout<<endl;
return 0;
}
(2)
#include <iostream>
using namespace std;
void recur(char);
int main()
{
recur('0');
}
void recur(char c)
{
cout<<c;
if(c<'5')
recur(c+1);
cout<<c;
}
(3)
#include<iostream>
using namespace std;
int fun2(int a,int b)
{
int c;
c=a*b%3;
return c;
}
int fun1(int &a,int &b)
{
int c;
a+=a;
b+=b;
c=fun2(a,b);
return c*c;
}
int main()
{
int x=11,y=19;
cout<<fun1(x,y)<<endl;
return 0;
}