/* Author - ~swim~ Date - 30-Apr-2018 Description [ASSIGNMENT] Question marks ! (coderbyte problem) Code QuestionsMarks(str) take the str string parameter, which will contain single digit numbers, letters, and question marks, and check if there are exactly 3 question marks between every pair of two numbers that add up to 10. If so, then your program should return the string true, otherwise it should return the string false. If there aren't any two numbers that add up to 10 in the string, then your program should return false as well. For example: if str is "arrb6???4xxbl5???eee5" -> true */ #include #include #include using namespace std; bool Validate(auto & ustr) { string const dig{"0123456789"}; auto pos{0}, priv{pos}; pos = ustr.find_first_of(dig, pos); if (string::npos != pos) { priv = pos; bool No_sum10_pairs{false}; bool sum10_pairs{false}; while ((pos=ustr.find_first_of( dig, pos + 1)) != string::npos) { size_t privv = ustr.at(priv) - '0'; size_t posv = ustr.at(pos) - '0'; if (10 != (privv + posv)) { priv = pos; No_sum10_pairs = true; continue; } sum10_pairs = true; int cnt = 0; for (auto s = priv; s != pos; ++s) { if ('?' == ustr.at(s)) ++cnt; // '?' count is > 3, then string is // invalid if (cnt > 3) break; } // end for if(cnt != 3) return false; priv = pos; } // end while if(No_sum10_pairs && !sum10_pairs) return false; } // end if(string::npos != pos) return true; } // end Validate int main() { string teststr[] { "5???5???5", "arrb6???4?xbl5???eee5", "arrb6???3?xbl5???eee5", "0arrb5???5xxbl4???eee0", "arrb6???4x?bl5???eee5", "4?r5", "-12???22$$%$%%%%???×××8....6??5", "2???7&&&8???2", "8??2", "8??????2", "10???", "1bgbgdbh???dfbdbdxfg8", "1bgbgdbh???dfbdbdxfg9", "1bgbgdbh??dfbdbdxfg9", "8???2???84", "46???4???5", "5?a??5???5", "2aa*^8", "0???5", "5???0", "3?7", "454", "4???6???3" }; for (auto && e:teststr) { cout << boolalpha << e << " - " << Validate(e) << "\n"; } } // end main

[Assignment] Three_question_marks.cpp