de using namespace std; //definig numSevens function int numSevens(int s){ //checking if number is 0 if(s==0)

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Explain in detail how this recursive function works:

Program description: The program counts then number of 7's in a number

 

C++ code:

#include <iostream>
using namespace std;
//definig numSevens function
int numSevens(int s){
//checking if number is 0
if(s==0)
//returning 0
return 0;
//checking if last digit is 7
else if(s%10==7)
//returning 1 and recursively calling numSevens function for the next digit
return(1+numSevens(s/10));
else
//returning 0 and recursively calling numSevens function for the next digit
return(0+numSevens(s/10));
}
int main()
{
//calling numSevens function for a sample value and printing result
cout<<numSevens(47364778)<<endl;
return 0;
}

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