1. Use recursion to write a function count_ones that returns how many Is there are in a number n when represented in decimal (base 10). For example, 1231 has two 1s. You can assume that n is nonnegative and at most 9 digits long. Do not use global (or static) variables. In main perform at least three tests of count_ones and use assert to check that the returned value is correct. Your function should have the following prototype: // count_ones (n) returns the number of is in the decimal 77 representation of n // requires: 0 <= n < 10^9 int count_ones (int n);

1. Use recursion to write a function count_ones that returns how many Is there are in a number n when represented in decimal (base 10). For example, 1231 has two 1s. You can assume that n is nonnegative and at most 9 digits long. Do not use global (or static) variables. In main perform at least three tests of count_ones and use assert to check that the returned value is correct. Your function should have the following prototype: // count_ones (n) returns the number of is in the decimal 77 representation of n // requires: 0 <= n < 10^9 int count_ones (int n);

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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Concept explainers

Declaring and Defining the function

A set of statements, which performs a particular task is called a function. The program gains modularity by using function. The application is quite easy to understand, read, and edit when they are created with functions. The developer/programmer creates a function and uses main() to call the function. Once the function gets executed, the control is transferred to the main program.

Question

Midterm Practice Problems
1. Use recursion to write a function count_ones that returns how many Is there are in
a number n when represented in decimal (base 10). For example, 1231 has two 1s.
You can assume that n is nonnegative and at most 9 digits long. Do not use global
(or static) variables.
In main perform at least three tests of count_ones and use assert to check that the
returned value is correct. Your function should have the following prototype:
// count_ones (n) returns the number of is in the decimal
representation of n
// requires: 0 <= n < 10^9
int count_ones (int n);

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