Yes, sometimes even tests can not always detect an STI.
For example: Lesions that are suspected to be Herpes can be swabbed and tested but may not come back as Herpes. Sometimes a blood test can be ordered to find out for sure.
However, with the correct testing for each STI there should be a correct result that is certain. Chlamydia and Gonorrhea should be tested from a swab cultures, viral STI's should be detected by blood.
Syphilis and gonorrhea come to mind.
A logical error is an error that violates a class invariant or a logical precondition. Logic errors are typically detected at compile time and typically throw a derivative of std::logic_error exception. By contrast, runtime exceptions throw a derivative of std::runtime_error. Both classes can be found in <stdexcept>. The built-in std::logic_error types are: domain_error, invalid_argument, length_error, out_of_range and future_error.
#include<iostream> int main() { std::cout << "sin(1) = " << std::sin(1.0) << std::endl; std::cout << "cos(1) = " << std::cos(1.0) << std::endl; std::cout << "tan(1) = " << std::tan(1.0) << std::endl; std::cout << "asin(1) = " << std::asin(1.0) << std::endl; std::cout << "acos(1) = " << std::acos(1.0) << std::endl; std::cout << "atan(1) = " << std::atan(1.0) << std::endl; } Output: sin(1) = 0.841471 cos(1) = 0.540302 tan(1) = 1.55741 asin(1) = 1.5708 acos(1) = 0 atan(1) = 0.785398
#include<iostream> #include<vector> #include<string> std::vector<std::string> parse (const std::string& s, const char delim) { std::vector<std::string> result {}; auto start = 0U; auto end = s.find (delim); while (end != s.npos) { result.push_back (s.substr(start, end - start)); start = ++end; end = s.find (delim, start); } result.push_back (s.substr (start, s.npos - start)); return result; } std::vector<std::string> parse (const std::string& s, const std::string& delim) { std::vector<std::string> result {}; auto start = 0U; auto end = s.find (delim); while (end != s.npos) { result.push_back (s.substr(start, end - start)); start = end + delim.length(); end = s.find (delim, start); } result.push_back (s.substr (start, s.npos - start)); return result; } int main() { std::string str1 = "This is a string that will be parsed by a single-space delimiter."; std::string str2 = "This==is==a==string==that==will==be==parsed==by==equal==operator."; std::string str3 = "This string has no delimiter."; std::cout << str1 << std::endl; std::vector<std::string> v1 = parse (str1, ' '); for (auto i : v1 ) std::cout << i << std::endl; std::cout << std::endl; std::cout << str2 << std::endl; std::vector<std::string> v2 = parse (str2, "=="); for (auto i : v2 ) std::cout << i << std::endl; std::cout << std::endl; std::cout << str3 << std::endl; std::vector<std::string> v3 = parse (str3, '\\'); for (auto i : v3 ) std::cout << i << std::endl; std::cout << std::endl; }
The following example demonstrates all 4 loop structures in C++. #include<iostream> int main() { int i; std::cout<<"For loop...\n"<<std::endl; for(i=0; i<10; ++i) std::cout<<i; std::cout<<'\n'<<std::endl; std::cout<<"While loop...\n"<<std::endl; i=0; while(i<10) std::cout<<i++; std::cout<<'\n'<<std::endl; std::cout<<"Do-while loop...\n"<<std::endl; i=0; do { std::cout<<i; }while( ++i<10 ); std::cout<<'\n'<<std::endl; std::cout<<"Goto loop...\n"<<std::endl; i=0; again: std::cout<<i; if(++i<10) goto again; std::cout<<'\n'<<std::endl; } Output: For loop... 0123456789 While loop... 0123456789 Do-while loop... 0123456789 Goto loop... 0123456789
Mumps is not a STD.
Haemophilus is not a STD.
int main() { std::string first, last; std::cout << "Enter your first name: "; std::cin >> first; std::cout << "Enter your last name: "; std::cin >> last; }
The following code demonstrates how the end of file can be detected. Note that you do not test std::istream::eof() directly. The eof flag is only set when you read past the end of a file, not when you read the last character in a file. That is, if the file has three characters and you extract three characters, eof is not set at that point. It is only set when you attempt to read another character and there is no character there. At that point you are past the end of the file and the flag is set. #include<iostream> #include<fstream> int main() { char * filename = "test.txt"; // create a 3-character file std::ofstream outfile; outfile.open (filename, std::ios::out); outfile << "ABC"; outfile.close(); std::ifstream infile; infile.open (filename, std::ios::in); char ch; while (infile.get(ch)) { std::cout << ch; std::cout << "\tEOF flag is " << (infile.eof()?"":"not") << " set\n"; } std::cout << "EOF flag is " << (infile.eof()?" ":"not ") << "set\n"; infile.close(); }
std::cout << std::bitset<CHAR_BIT>( 876 ) << std::endl;
#include<iostream> int main() { int num1, num2; std::cout << "C++ addition program" << std::endl; std::cout << "Enter a number: "; std::cin >> num1; std::cout << "Enter another number: "; std::cin >> num2; std::cout << "The sum is " << num1 + num2 << std::endl; }
#include<iostream> #include<string> #include<sstream> #include<vector> #include<stack> std::string convert (const std::string& str) { std::string valid("abcdefghijklmnopqrstuvwxyz"); std::string result; for (auto it=str.begin(); it!=str.end(); ++it) { // convert to lower case const char c = (char) tolower(*it); // ensure character is a letter if (valid.find(c)!=valid.npos) result += c; } return result; } bool equal (const std::string& a, const std::string& b) { return convert(a)==convert(b); } std::vector<std::string> get_words (const std::string& s) { std::vector<std::string> elems; std::stringstream ss (s); std::string item; while (std::getline(ss, item, ' ')) elems.push_back (item); return elems; } std::string remove_duplicates (const std::string& s) { std::vector<std::string> elems = get_words (s); std::stack<std::string> stack; while (!elems.empty()) { std::string last = elems.back(); elems.pop_back(); bool found = false; for (auto it=elems.begin(); !found && it!=elems.end(); ++it) found = equal(last, *it); if (!found) stack.push (last); } std::string result; while (!stack.empty()) { if (result.size()) result += ' '; result += stack.top(); stack.pop(); } return result; } int main() { std::string test_string ("The fox and and the hound."); std::string result = remove_duplicates (test_string); std::cout << "Test string:\t"" << test_string << ""\n"; std::cout << "Result:\t\t"" << result << ""\n" << std::endl; }