oneLineRecursiveCall return integer,if input as abcd,return is dcba

recursionExample.cpp

#include<iostream>
using namespace std;


/*
    int number(int a,int b=0){ return(a==0 ? b : number(a/10,b*10+a%10));}

    understandable form of this recursive call
*/
int number(int i,int a,int b=0)
{
    cout<<"i="<<i<<" a="<<a<<" b="<<b<<endl;
    ++i;

    if(a==0)
        return b;
    else
        return number(i,a/10,b*10+a%10);
}


int main(void)
{
    cout<<number(0,1234);

    return 0;
}