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What is the bug in this program? when I run it I get false false true false the output should be false false true true

What is the bug in this program? when I run it I get false false true false the output should be false false true true

Database System Concepts
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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What is the bug in this program? when I run it I get false false true false the output should be false false true true
8. bool isPalindrome (const vector<int>& v); 10 Dint main() { 11 vector<int> v1False{ 1, 2, 3, 4, 1 }; 12 cout <« boolalpha << isPalindrome (vlFalse) << endl; 13 14 vector<int> v2False{ 1, 2, 3, 4, 2, 1 }; 15 cout << boolalpha << isPalindrome (v2False) << endl; 16 17 vector<int> v1True{ 1, 2, 3, 2, 1 }; 18 cout << boolalpha << isPalindrome (v1True) <« endl; 19 20 vector<int> v2True{ 1, 2, 3, 3, 2, 1 }; 21 cout << boolalpha << isPalindrome (v2True) <« endl; 22 23 system ("pause"); 24 return 0; 25 26 Obool isPalindrome (const vector<int>& v) { 0) { 27 28 if (v.size () == 29 return true; 30 } auto front = v.begin (); // first element of v. auto rear = --v.end() ; // last element of v. 31 32 33 34 // algorithm: // iterators front and rear move towards center. // if there is a mismatch, the loop ends // if palindrome, front and rear both get to middle. 35 36 37 38 // as long as front and rear elements have the same value // and front hasn't gone past rear, increment both. 39 40 41 for (; *front == *rear && front < rear; ++front, --rear 42 // check positions of front and rear. // if 43 44 re is a mismatch, it will happen 45 // before front passes rear. 46 return front == rear; 47
Transcribed Image Text:8. bool isPalindrome (const vector<int>& v); 10 Dint main() { 11 vector<int> v1False{ 1, 2, 3, 4, 1 }; 12 cout <« boolalpha << isPalindrome (vlFalse) << endl; 13 14 vector<int> v2False{ 1, 2, 3, 4, 2, 1 }; 15 cout << boolalpha << isPalindrome (v2False) << endl; 16 17 vector<int> v1True{ 1, 2, 3, 2, 1 }; 18 cout << boolalpha << isPalindrome (v1True) <« endl; 19 20 vector<int> v2True{ 1, 2, 3, 3, 2, 1 }; 21 cout << boolalpha << isPalindrome (v2True) <« endl; 22 23 system ("pause"); 24 return 0; 25 26 Obool isPalindrome (const vector<int>& v) { 0) { 27 28 if (v.size () == 29 return true; 30 } auto front = v.begin (); // first element of v. auto rear = --v.end() ; // last element of v. 31 32 33 34 // algorithm: // iterators front and rear move towards center. // if there is a mismatch, the loop ends // if palindrome, front and rear both get to middle. 35 36 37 38 // as long as front and rear elements have the same value // and front hasn't gone past rear, increment both. 39 40 41 for (; *front == *rear && front < rear; ++front, --rear 42 // check positions of front and rear. // if 43 44 re is a mismatch, it will happen 45 // before front passes rear. 46 return front == rear; 47
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