Answered: Consider the following function…

Computer Networking: A Top-Down Approach (7th Edition)

7th Edition

ISBN:9780133594140

Author:James Kurose, Keith Ross

Publisher:James Kurose, Keith Ross

Chapter1: Computer Networks And The Internet

Section: Chapter Questions

Problem R1RQ: What is the difference between a host and an end system? List several different types of end...

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Question

Consider the following function reverse, that attempts to reverse an array in place (i.e. without the use of additional storage). It does it by interchanging the first and last elements, then the second and second from last etc. All of the interchanges are done by calling function interchange. Here are the two functions and a main program:

#include <iostream> using namespace std; void interchange(int* x, int* y) { int temp; temp = *x; *x = *y; *y = temp;

}

void reverse(int *ptr, int first, int last) { int *endptr; endptr = ptr + last; for ( ptr += first; ptr <= endptr; ptr++, endptr-- ) { interchange(&ptr, &endptr); }

}

int main() {

int a[3] = { 1, 2, 3 }; reverse(a, 0, 2); for ( int i = 0; i < 3; i++ ) cout << a[i] << ", ";

}

(a) When I run the program, I expect to see the output reverse the array, but it doesn’t. Why?
(b) What very simple change will fix it (so the program will print 3, 2, 1, ) and explain your change.

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