please solve within 30 minutes... Complete implementations of the following functions.// first_digit (n) returns the first decimal digit of n// requires: 0 <= n < 10^9int first digit(int n);// double_digits (n) returns the number consisting of the decimal digits of n// doubled, so 123 becomes 246; digits 5 to 9 should be replaced with 9// requires: 0 <= n < 10^9int double_digits (int n);Provide at least five tests per function including edge cases.Provide a comment at the bottom of your code describing how your implementations work usingcomplete sentences. You will be marked on if your description demonstrates an understanding ofyour code.Please use C and use recursion to solve this question.Please give some explanation about double_digit.There are some example of double-digit1234->24684567-> 8999579-> 999

if(n>=0) return true; // if n is greater than 0 or equal to 0 than return true int…

Complete implementations of the following functions. // first_digit (n) returns the first decimal digit of n // requires: 0 <= n < 10^9 int first digit(int n); // double_digits (n) returns the number consisting of the decimal digits of r // doubled, so 123 becomes 246; digits 5 to 9 should be replaced with 9 // requires: 0 <= n < 10^9 int double_digits (int n);

Complete implementations of the following functions. // first_digit (n) returns the first decimal digit of n // requires: 0 <= n < 10^9 int first digit(int n); // double_digits (n) returns the number consisting of the decimal digits of r // doubled, so 123 becomes 246; digits 5 to 9 should be replaced with 9 // requires: 0 <= n < 10^9 int double_digits (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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