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Description html markup shown to student	​ Write a function <tt>string complement(string dna)</tt> that takes a string containing only the capital letters <tt>A</tt>, <tt>C</tt>, <tt>T</tt>, <tt>G</tt>, (representing DNA), and returns its <i>Watson-Crick complement</i>: replace <tt>A</tt> with <tt>T</tt>, <tt>C</tt> with <tt>G</tt>, and vice-versa. ​ <p>For example, <tt>complement("GATTACA")</tt> should return <tt>"CTAATGT"</tt>. (You may assume the input is valid, there is no need to check for non-DNA characters.) ​ ​
Epilogue html markup shown when solved	​ remove
Public permissions	open: anyone can solve, see in listings, see sourceopen: open, but when viewing source, redact solution (default)closed-source, but list publicly and anyone can attempt itclosed-source, and hide from listings (need direct URL to attempt)draft: don't let anyone other than me see this at all remove
Remarks Comments, history, license, etc.	​ remove
Engine	Select one... (default)JavaC++ (call main with stdin and args)C++ (call functions directly)Multiple true/falseShort answer
Choices json list of string, bool pairs e.g. [["good", true], ["bad", false]]	​
Correct answer
Template / Reference solution	​
Template / Reference solution	​ #include <iostream> #include <string> using namespace std; ​ // replace all 'C's with 'G's and vice-versa // replace all 'A's with 'T's and vice-versa string complement(string dna) { \[ string result = dna; // create string of same length int n = dna.length(); for (int i=0; i<n; i++) { if (dna[i] == 'C') result[i] = 'G'; else if (dna[i] == 'G') result[i] = 'C'; else if (dna[i] == 'A') result[i] = 'T'; else if (dna[i] == 'T') result[i] = 'A'; } return result; ]\ }
Java test suite See manual	​
C++ test suite json list of stdin/args tests e.g. [{"stdin":"hi", "args":["4", "5"]}, {"stdin":"noargs"}] to just run once with no input use [{}]	​
C++ test suite See manual	[ ["check-function", "complement", "string", ["string"]], ["call-function", "complement", ["\"GAATTACA\""]], ["call-function", "complement", ["\"CAT\""]], ["call-function", "complement", ["\"TAGACAT\""]], ["call-function", "complement", ["\"GCGAGTGAGC\""]], ["call-function", "complement", ["\"\""]] ] ​
Forbidden substrings json list of strings e.g. ["for","while"]	​ remove
Solution visibility	AlwaysAfter 1 attemptAfter solving or 2 attemptsAfter solving or 3 attemptsAfter solving or 4 attemptsAfter solving or 5 attemptsAfter solving (default)Never remove
Java imports json list of importables e.g. ["java.util.*"]	​ remove
Override Java classname else defaults to websheet name	remove
Dependent on other websheets? json list of websheet names in this folder e.g. ["DataStructure"]	​ remove
Is example? i.e., just a demo	False (default)True remove
Add compiler flag(s) json list of flags e.g. ["-Wno-unused-variable"]	​ remove
Remove default compiler flag(s) json list of flags see default_cppflags e.g. ["-Wno-write-strings"]	​ remove

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Note: problems are open-source by default (see 'Public permissions'). Assumed license for open problems is Creative Commons 4.0 Attribution-ShareAlike unless specified in 'Remarks'.