{"id":15412,"date":"2024-04-23T15:43:11","date_gmt":"2024-04-23T12:13:11","guid":{"rendered":"https:\/\/www.itpiran.net\/blog\/?p=15412"},"modified":"2024-04-23T15:43:11","modified_gmt":"2024-04-23T12:13:11","slug":"compare-strings-in-c-plus-plus","status":"publish","type":"post","link":"https:\/\/www.itpiran.net\/blog\/ja\/tutorials\/compare-strings-in-c-plus-plus\/","title":{"rendered":"C++\u3067\u6587\u5b57\u5217\u3092\u6bd4\u8f03\u3059\u308b3\u3064\u306e\u65b9\u6cd5"},"content":{"rendered":"<h2 id=\"%d9%85%d9%82%d8%af%d9%85%d9%87\">\u5c0e\u5165<\/h2>\n<p>\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001C++ \u3067\u6587\u5b57\u5217\u3092\u6bd4\u8f03\u3059\u308b\u65b9\u6cd5\u3092\u5b66\u7fd2\u3057\u307e\u3059\u3002.<\/p>\n<h2 id=\"1-%d8%a7%d8%b3%d8%aa%d9%81%d8%a7%d8%af%d9%87-%d8%a7%d8%b2-%d8%aa%d8%a7%d8%a8%d8%b9-strcmp-%d8%af%d8%b1-c\">1. C++\u3067strcmp()\u95a2\u6570\u3092\u4f7f\u7528\u3059\u308b<\/h2>\n<p>C++ String\u306b\u306f\u3001\u6587\u5b57\u5217\u30c7\u30fc\u30bf\u3092\u64cd\u4f5c\u3059\u308b\u305f\u3081\u306e\u7d44\u307f\u8fbc\u307f\u95a2\u6570\u304c\u3042\u308a\u307e\u3059\u3002strcmp()\u95a2\u6570\u306f\u30012\u3064\u306e\u6587\u5b57\u5217\u3092\u8f9e\u66f8\u9806\u306b\u6bd4\u8f03\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u308bC\u30e9\u30a4\u30d6\u30e9\u30ea\u95a2\u6570\u3067\u3059\u3002.<\/p>\n<ul>\n<li>\u5165\u529b\u6587\u5b57\u5217\u306f\u3001C \u30b9\u30bf\u30a4\u30eb\u306e\u6587\u5b57\u5217\u306e\u6587\u5b57\u914d\u5217\u3067\u3042\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002.<\/li>\n<li>strcmp() \u306f\u5927\u6587\u5b57\u3068\u5c0f\u6587\u5b57\u3092\u533a\u5225\u3057\u3066\u6587\u5b57\u5217\u3092\u6bd4\u8f03\u3057\u307e\u3059\u3002.<\/li>\n<\/ul>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-cpp\" data-lang=\"C++\"><code>int strcmp(const char *str1, const char *str2);<\/code><\/pre>\n<\/div>\n<p>\u3053\u306e\u95a2\u6570\u306f\u3001\u4e00\u81f4\u3059\u308b\u9805\u76ee\u306b\u5fdc\u3058\u3066\u6b21\u306e\u5024\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n<ul>\n<li>\u4e21\u65b9\u306e\u6587\u5b57\u5217\u304c\u540c\u3058\u5834\u5408\u306f 0 \u3092\u8fd4\u3057\u307e\u3059\u3002.<\/li>\n<li>\u6700\u521d\u306e\u6587\u5b57\u5217\u306e\u6587\u5b57\u5024\u304c 2 \u756a\u76ee\u306e\u6587\u5b57\u5217\u5165\u529b\u3088\u308a\u3082\u5c0f\u3055\u3044\u5834\u5408\u306f\u3001&lt; 0 (\u30bc\u30ed\u672a\u6e80) \u3092\u8fd4\u3057\u307e\u3059\u3002.<\/li>\n<li>\u6bd4\u8f03\u306e 2 \u756a\u76ee\u306e\u6587\u5b57\u5217\u304c\u5927\u304d\u3044\u5834\u5408\u3001\u7d50\u679c\u306f &gt; 0 (\u30bc\u30ed\u3088\u308a\u5927\u304d\u3044) \u306b\u306a\u308a\u307e\u3059\u3002.<\/li>\n<\/ul>\n<p>\u6b21\u306e\u30b3\u30fc\u30c9\u3092\u5b9f\u884c\u3057\u307e\u3059\u3002<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-cpp\" data-lang=\"C++\"><code>#include &lt;iostream&gt;\r\n#include &lt;string.h&gt;\r\nint main()\r\n{\r\nconst char *str_inp1 = \"String Match\";\r\nconst char *str_inp2 = \"String Unmatch\";\r\nstd::cout &lt;&lt; \"String 1: \" &lt;&lt; str_inp1 &lt;&lt; std::endl;\r\nstd::cout &lt;&lt; \"String 2: \" &lt;&lt; str_inp2 &lt;&lt; std::endl;\r\nif (strcmp(str_inp1, str_inp2) == 0)\r\nstd::cout &lt;&lt; \"\\nBoth the input strings are equal.\" &lt;&lt; std::endl;\r\nelse\r\nstd::cout &lt;&lt; \"\\nThe input strings are not equal.\" &lt;&lt; std::endl;\r\n}<\/code><\/pre>\n<\/div>\n<p>\u3053\u308c\u306b\u3088\u308a\u3001\u6b21\u306e\u51fa\u529b\u304c\u751f\u6210\u3055\u308c\u307e\u3059\u3002<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-plain\" data-lang=\"Plain Text\"><code>OutputString 1: String Match\r\nString 2: String Unmatch\r\nThe input strings are not equal.<\/code><\/pre>\n<\/div>\n<\/div>\n<p>strcmp(str_inp1, str_inp2) \u306e\u7d50\u679c\u306f -9 \u3067\u3059\u3002str_inp1 \u3068 str_inp2 \u306e\u5024\u304c\u7570\u306a\u308a\u307e\u3059\u3002.<\/p>\n<p>\u6b21\u306e\u30b3\u30fc\u30c9\u3092\u5b9f\u884c\u3057\u307e\u3059\u3002<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-plain\" data-lang=\"Plain Text\"><code>#include &lt;iostream&gt;\r\n#include &lt;string.h&gt;\r\nint main()\r\n{\r\nconst char *str_inp1 = \"String Match\";\r\nconst char *str_inp2 = \"String Match\";\r\nstd::cout &lt;&lt; \"String 1: \" &lt;&lt; str_inp1 &lt;&lt; std::endl;\r\nstd::cout &lt;&lt; \"String 2: \" &lt;&lt; str_inp2 &lt;&lt; std::endl;\r\nif (strcmp(str_inp1, str_inp2) == 0)\r\nstd::cout &lt;&lt; \"\\nBoth the input strings are equal.\" &lt;&lt; std::endl;\r\nelse\r\nstd::cout &lt;&lt; \"\\nThe input strings are not equal.\" &lt;&lt; std::endl;\r\n}<\/code><\/pre>\n<\/div>\n<p>\u3053\u308c\u306b\u3088\u308a\u3001\u6b21\u306e\u51fa\u529b\u304c\u751f\u6210\u3055\u308c\u307e\u3059\u3002<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-plain\" data-lang=\"Plain Text\"><code>Output\r\nString 1: String Match\r\nString 2: String Match\r\nBoth the input strings are equal.<\/code><\/pre>\n<\/div>\n<p>strcmp(str_inp1, str_inp2)\u306f0\u3092\u8fd4\u3057\u307e\u3059\u3002str_inp1\u3068str_inp2\u306e\u5024\u306f\u540c\u3058\u3067\u3059\u3002.<\/p>\n<h2 id=\"2-%d8%a7%d8%b3%d8%aa%d9%81%d8%a7%d8%af%d9%87-%d8%a7%d8%b2-%d8%aa%d8%a7%d8%a8%d8%b9-compare-%d8%af%d8%b1-c\">2. C++\u3067compare()\u95a2\u6570\u3092\u4f7f\u3046<\/h2>\n<p>C++ \u306b\u306f\u30012 \u3064\u306e\u6587\u5b57\u5217\u3092\u6bd4\u8f03\u3059\u308b\u305f\u3081\u306e compare() \u95a2\u6570\u304c\u7d44\u307f\u8fbc\u307e\u308c\u3066\u3044\u307e\u3059\u3002.<\/p>\n<p>compare() \u95a2\u6570\u306f 2 \u3064\u306e\u6587\u5b57\u5217\u3092\u6bd4\u8f03\u3057\u307e\u3059\u3002<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-cpp\" data-lang=\"C++\"><code>int compare (const string&amp; string-name) const;<\/code><\/pre>\n<\/div>\n<p>\u3053\u306e\u95a2\u6570\u306f\u3001\u4e00\u81f4\u3059\u308b\u9805\u76ee\u306b\u5fdc\u3058\u3066\u6b21\u306e\u5024\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n<ul>\n<li>\u4e21\u65b9\u306e\u6587\u5b57\u5217\u304c\u540c\u3058\u5834\u5408\u306f 0 \u3092\u8fd4\u3057\u307e\u3059\u3002.<\/li>\n<li>\u6700\u521d\u306e\u6587\u5b57\u5217\u306e\u6587\u5b57\u5024\u304c 2 \u756a\u76ee\u306e\u6587\u5b57\u5217\u5165\u529b\u3088\u308a\u3082\u5c0f\u3055\u3044\u5834\u5408\u306f\u3001&lt; 0 (\u30bc\u30ed\u672a\u6e80) \u3092\u8fd4\u3057\u307e\u3059\u3002.<\/li>\n<li>\u6bd4\u8f03\u306e 2 \u756a\u76ee\u306e\u6587\u5b57\u5217\u304c\u5927\u304d\u3044\u5834\u5408\u3001\u7d50\u679c\u306f &gt; 0 (\u30bc\u30ed\u3088\u308a\u5927\u304d\u3044) \u306b\u306a\u308a\u307e\u3059\u3002.<\/li>\n<\/ul>\n<p>\u6b21\u306e\u30b3\u30fc\u30c9\u3092\u5b9f\u884c\u3057\u307e\u3059\u3002<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-cpp\" data-lang=\"C++\"><code>#include &lt;iostream&gt;\r\nint main()\r\n{\r\nstd::string str_inp1(\"String Match\");\r\nstd::string str_inp2(\"String Match\");\r\nstd::cout &lt;&lt; \"String 1: \" &lt;&lt; str_inp1 &lt;&lt; std::endl;\r\nstd::cout &lt;&lt; \"String 2: \" &lt;&lt; str_inp2 &lt;&lt; std::endl;\r\nint res = str_inp1.compare(str_inp2);\r\nif (res == 0)\r\nstd::cout &lt;&lt; \"\\nBoth the input strings are equal.\" &lt;&lt; std::endl;\r\nelse if (res &lt; 0)\r\nstd::cout &lt;&lt; \"\\nString 1 is smaller as compared to String 2.\" &lt;&lt; std::endl;\r\nelse\r\nstd::cout &lt;&lt; \"\\nString 1 is greater as compared to String 2.\" &lt;&lt; std::endl;\r\n}<\/code><\/pre>\n<\/div>\n<p>\u3053\u306e\u4f8b\u3067\u306f\u3001str_inp1 \u3068 str_inp2 \u304c compare() \u3067\u6bd4\u8f03\u3055\u308c\u307e\u3059\u3002<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-plain\" data-lang=\"Plain Text\"><code>Output\r\nString 1: String Match\r\nString 2: String Match\r\nBoth the input strings are equal.<\/code><\/pre>\n<\/div>\n<p>\u4e21\u65b9\u306e\u6587\u5b57\u5217\u306f\u8a9e\u5f59\u7684\u306b\u540c\u4e00\u306a\u306e\u3067\u3001\u95a2\u6570\u306f 0 \u3092\u8fd4\u3057\u307e\u3059\u3002.<\/p>\n<p>\u6b21\u306e\u30b3\u30fc\u30c9\u3092\u5b9f\u884c\u3057\u307e\u3059\u3002<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-cpp\" data-lang=\"C++\"><code>#include &lt;iostream&gt;\r\nint main()\r\n{\r\nstd::string str_inp0(\"String Match\");\r\nstd::string str_inp1(\"String Match\");\r\nstd::string str_inp2(\"String Unmatch\");\r\nstd::cout &lt;&lt; \"String 1: \" &lt;&lt; str_inp1 &lt;&lt; std::endl;\r\nif (str_inp1.compare(str_inp0) == 0)\r\nstd::cout &lt;&lt; \"\\nStrings are equal.\" &lt;&lt; std::endl;\r\nelse\r\nstd::cout &lt;&lt; \"\\nStrings are not equal.\" &lt;&lt; std::endl;\r\nstd::cout &lt;&lt; \"String 2: \" &lt;&lt; str_inp2 &lt;&lt; std::endl;\r\nif (str_inp2.compare(str_inp0) == 0)\r\nstd::cout &lt;&lt; \"\\nStrings are equal.\" &lt;&lt; std::endl;\r\nelse\r\nstd::cout &lt;&lt; \"\\nStrings are not equal.\" &lt;&lt; std::endl;\r\n}<\/code><\/pre>\n<\/div>\n<p>\u3053\u306e\u4f8b\u3067\u306f\u3001str_inp0 \u304c str_inp1 \u3068\u6bd4\u8f03\u3055\u308c\u307e\u3059\u3002<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-plain\" data-lang=\"Plain Text\"><code>Output\r\nString 1: String Match\r\nStrings are equal.<\/code><\/pre>\n<\/div>\n<p>\u6b21\u306b\u3001str_inp0 \u3068 str_inp2 \u3092\u6bd4\u8f03\u3057\u307e\u3059\u3002<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-plain\" data-lang=\"Plain Text\"><code>Output\r\nString 2: String Unmatch\r\nStrings are not equal.<\/code><\/pre>\n<\/div>\n<p>\u3053\u306e\u30b3\u30fc\u30c9\u306f\u3001compare() \u95a2\u6570\u3092\u4f7f\u7528\u3057\u3066\u6587\u5b57\u5217\u3092\u5225\u306e\u5165\u529b\u6587\u5b57\u5217\u3068\u76f4\u63a5\u6bd4\u8f03\u3057\u307e\u3059\u3002.<\/p>\n<h2 id=\"3-%d8%b9%d9%85%d9%84%da%af%d8%b1%d9%87%d8%a7%db%8c-%d8%b1%d8%a7%d8%a8%d8%b7%d9%87-%d8%a7%db%8c-%d8%af%d8%b1-c\">3. C++\u306b\u304a\u3051\u308b\u95a2\u4fc2\u6f14\u7b97\u5b50<\/h2>\n<p>== (\u7b49\u3057\u3044) \u3084 != (\u7b49\u3057\u304f\u306a\u3044) \u306a\u3069\u306e C++ \u95a2\u4fc2\u6f14\u7b97\u5b50\u306f\u3001\u6587\u5b57\u5217\u306e\u6bd4\u8f03\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002.<\/p>\n<p>2\u3064\u306e\u5024\u304c\u7b49\u3057\u3044\u304b\u3069\u3046\u304b\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-cpp\" data-lang=\"C++\"><code>string1 == string2<\/code><\/pre>\n<\/div>\n<\/div>\n<p>2\u3064\u306e\u5024\u304c\u7b49\u3057\u304f\u306a\u3044\u304b\u3069\u3046\u304b\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-cpp\" data-lang=\"C++\"><code>string1 != string2<\/code><\/pre>\n<\/div>\n<h5 id=\"%d9%85%d8%ab%d8%a7%d9%84-1-%d8%a7%d8%b3%d8%aa%d9%81%d8%a7%d8%af%d9%87-%d8%a7%d8%b2-%d8%b9%d9%85%d9%84%da%af%d8%b1-c\">\u4f8b1: C++ ==\u6f14\u7b97\u5b50\u306e\u4f7f\u7528<\/h5>\n<p>\u6b21\u306e\u30b3\u30fc\u30c9\u3092\u5b9f\u884c\u3057\u307e\u3059\u3002<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-cpp\" data-lang=\"C++\"><code>#include &lt;iostream&gt;\r\nint main()\r\n{\r\nstd::string str_inp1;\r\nstd::string str_inp2;\r\nstd::cout &lt;&lt; \"Enter the String 1:\\n\";\r\nstd::cin &gt;&gt; str_inp1;\r\nstd::cout &lt;&lt; \"Enter the String 2:\\n\";\r\nstd::cin &gt;&gt; str_inp2;\r\nif (str_inp1 == str_inp2)\r\nstd::cout &lt;&lt; \"Strings are equal\" &lt;&lt; std::endl;\r\nelse\r\nstd::cout &lt;&lt; \"Strings are not equal\" &lt;&lt; std::endl;\r\n}<\/code><\/pre>\n<\/div>\n<p>\u300c\u6587\u5b57\u52171\u300d\u3068\u300c\u6587\u5b57\u52172\u300d\u306e\u5024\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-plain\" data-lang=\"Plain Text\"><code>Enter the String 1:\r\nDigitalOcean\r\nEnter the String 2:\r\ndigitalocean\r\nStrings are not equal<\/code><\/pre>\n<\/div>\n<p>\u3053\u306e\u30b3\u30fc\u30c9\u306f 2 \u3064\u306e\u6587\u5b57\u5217\u3092 == \u3067\u6bd4\u8f03\u3057\u307e\u3059\u3002.<\/p>\n<h5 id=\"%d9%85%d8%ab%d8%a7%d9%84-2-%d8%a7%d8%b3%d8%aa%d9%81%d8%a7%d8%af%d9%87-%d8%a7%d8%b2-%d8%b9%d9%85%d9%84%da%af%d8%b1-c\">\u4f8b2: C++ !=\u6f14\u7b97\u5b50\u306e\u4f7f\u7528<\/h5>\n<p>\u6b21\u306e\u30b3\u30fc\u30c9\u3092\u5b9f\u884c\u3057\u307e\u3059\u3002<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-cpp\" data-lang=\"C++\"><code>#include &lt;iostream&gt;\r\nint main()\r\n{\r\nstd::string str_inp1;\r\nstd::string str_inp2;\r\nstd::cout &lt;&lt; \"Enter the String 1:\\n\";\r\nstd::cin &gt;&gt; str_inp1;\r\nstd::cout &lt;&lt; \"Enter the String 2:\\n\";\r\nstd::cin &gt;&gt; str_inp2;\r\nif (str_inp1 != str_inp2)\r\nstd::cout &lt;&lt; \"Strings are not equal\" &lt;&lt; std::endl;\r\nelse\r\nstd::cout &lt;&lt; \"Strings are equal\" &lt;&lt; std::endl;\r\n}<\/code><\/pre>\n<\/div>\n<p>\u300c\u6587\u5b57\u52171\u300d\u3068\u300c\u6587\u5b57\u52172\u300d\u306e\u5024\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-plain\" data-lang=\"Plain Text\"><code>Enter the String 1:\r\nDigitalOcean\r\nEnter the String 2:\r\nDigitalOcean\r\nStrings are equal<\/code><\/pre>\n<\/div>\n<p>\u3053\u306e\u30b3\u30fc\u30c9\u306f != \u3092\u4f7f\u7528\u3057\u3066 2 \u3064\u306e\u6587\u5b57\u5217\u3092\u6bd4\u8f03\u3057\u307e\u3059\u3002.<\/p>\n<h2 id=\"%d9%86%d8%aa%db%8c%d8%ac%d9%87\">\u7d50\u679c<\/h2>\n<p>\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001C++\u306b\u304a\u3051\u308b\u6587\u5b57\u5217\u6bd4\u8f03\u30e1\u30bd\u30c3\u30c9\u306b\u3064\u3044\u3066\u5b66\u3073\u307e\u3057\u305f\u3002String\u95a2\u6570\u306estrcmp()\u3001\u7d44\u307f\u8fbc\u307f\u95a2\u6570\u306ecompare()\u3001\u305d\u3057\u3066\u95a2\u4fc2\u6f14\u7b97\u5b50\uff08==\u3001!=\uff09\u306b\u3064\u3044\u3066\u5b66\u3073\u307e\u3057\u305f\u3002.<\/p>","protected":false},"excerpt":{"rendered":"\u306f\u3058\u3081\u306b \u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001C++ \u3067\u6587\u5b57\u5217\u3092\u6bd4\u8f03\u3059\u308b\u65b9\u6cd5\u3092\u5b66\u3073\u307e\u3059\u30021. 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