{"id":2990,"date":"2012-08-30T02:42:02","date_gmt":"2012-08-30T02:42:02","guid":{"rendered":"http:\/\/ddolgi.pe.kr\/blog\/index.php\/2012\/08\/30\/cstringcompare-vs-strcmp\/"},"modified":"2012-08-30T02:42:02","modified_gmt":"2012-08-30T02:42:02","slug":"cstringcompare-vs-strcmp","status":"publish","type":"post","link":"http:\/\/ddolgi.pe.kr\/blog\/archives\/2990","title":{"rendered":"[C++]string.compare() vs strcmp()"},"content":{"rendered":"

\uacb0\uacfc<\/SPAN><\/H2>
\n

strA==strA<\/P>
\n

==> elapsed time : 1.08 sec<\/BLOCKQUOTE>
\n

strA==strB<\/P>
\n

==> elapsed time : 1.09 sec<\/BLOCKQUOTE>
\n

strcmp(szA,szB)<\/P>
\n

==> elapsed time : 0.12 sec<\/BLOCKQUOTE>
\n

strcmp(szA,szA)<\/P>
\n

==> elapsed time : 0.11 sec<\/BLOCKQUOTE>
\n

strcmp(strA,strB)<\/P>
\n

==> elapsed time : 0.25 sec<\/BLOCKQUOTE>
\n

strcmp(strA,strA)<\/P>
\n

==> elapsed time : 0.25 sec<\/BLOCKQUOTE><\/SPAN>
\n

Source Code<\/H2>
\n

\n#include <stdio.h>
\n#include <stdlib.h>
\n#include <string.h><\/p>\n
#include <string>
\n#include “Blib.h”<\/p>\n
using namespace std;
\n#define TEST_SIZE 1<<20
\n#define ITER 1<<25<\/p>\n
void compare()
\n{
\n  string strBuffer1(TEST_SIZE, ‘a’);
\n  string strBuffer2(TEST_SIZE, ‘b’);<\/p>\n
  char szBuffer1[TEST_SIZE+1];
\n  memset(szBuffer1 , ‘a’, TEST_SIZE);
\n  szBuffer1[TEST_SIZE]=’\\0′;
\n  char szBuffer2[TEST_SIZE+1];
\n  memset(szBuffer2 , ‘b’, TEST_SIZE);
\n  szBuffer2[TEST_SIZE]=’\\0′;<\/p>\n
  Blib::TStopWatch w;
\n  puts(“strA==strA\\n”);
\n  for (int i=0;i<ITER;i++)
\n    strBuffer1 == strBuffer2;
\n  w.Print(stderr);<\/p>\n
  w.Reset();
\n  puts(“strA==strB\\n”);
\n  for (int i=0;i<ITER;i++)
\n    strBuffer1 == strBuffer2;
\n  w.Print(stderr);<\/p>\n
  w.Reset();
\n  puts(“strcmp(szA,szB)\\n”);
\n  for (int i=0;i<ITER;i++)
\n    strcmp(szBuffer1, szBuffer2);
\n  w.Print(stderr);<\/p>\n
  w.Reset();
\n  puts(“strcmp(szA,szA)\\n”);
\n  for (int i=0;i<ITER;i++)
\n    strcmp(szBuffer1, szBuffer1);
\n  w.Print(stderr);<\/p>\n
  w.Reset();
\n  puts(“strcmp(strA,strB)\\n”);
\n  for (int i=0;i<ITER;i++)
\n    strcmp(strBuffer1.c_str(), strBuffer2.c_str());
\n  w.Print(stderr);<\/p>\n
  w.Reset();
\n  puts(“strcmp(strA,strA)\\n”);
\n  for (int i=0;i<ITER;i++)
\n    strcmp(strBuffer1.c_str(), strBuffer1.c_str());
\n  w.Print(stderr);
\n}<\/p>\n
main()
\n{
\n  compare();
\n}
\n<\/PRE>
\n
\ubd84\uc11d<\/SPAN><\/H2>
\n\uc5b4\uc774\uc5c6\ub2e4;;; string \uc548\uc5d0 \ubb50\uac00 \ub4e4\uc5b4\uc788\uae38\ub798 \uc800\ub9ac \ucc28\uc774\uac00 \ub098\ub204???<\/p>\n","protected":false},"excerpt":{"rendered":"
\uacb0\uacfc strA==strA ==> elapsed time : 1.08 sec strA==strB ==> elapsed time : 1.09 sec strcmp(szA,szB) ==> elapsed time : 0.12 sec strcmp(szA,szA) ==> elapsed time : 0.11 sec strcmp(strA,strB) ==> elapsed time : 0.25 sec strcmp(strA,strA) ==> elapsed time : 0.25 sec Source Code #include <stdio.h> #include <stdlib.h> #include <string.h> #include <string> #include “Blib.h” […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[275],"tags":[278],"class_list":["post-2990","post","type-post","status-publish","format-standard","hentry","category-275","tag-c"],"_links":{"self":[{"href":"http:\/\/ddolgi.pe.kr\/blog\/wp-json\/wp\/v2\/posts\/2990","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/ddolgi.pe.kr\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/ddolgi.pe.kr\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/ddolgi.pe.kr\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/ddolgi.pe.kr\/blog\/wp-json\/wp\/v2\/comments?post=2990"}],"version-history":[{"count":0,"href":"http:\/\/ddolgi.pe.kr\/blog\/wp-json\/wp\/v2\/posts\/2990\/revisions"}],"wp:attachment":[{"href":"http:\/\/ddolgi.pe.kr\/blog\/wp-json\/wp\/v2\/media?parent=2990"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/ddolgi.pe.kr\/blog\/wp-json\/wp\/v2\/categories?post=2990"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/ddolgi.pe.kr\/blog\/wp-json\/wp\/v2\/tags?post=2990"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}