{"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\/en\/tutorials\/compare-strings-in-c-plus-plus\/","title":{"rendered":"3 ways to compare Strings in C++"},"content":{"rendered":"<h2 id=\"%d9%85%d9%82%d8%af%d9%85%d9%87\">Introduction<\/h2>\n<p>In this article, you will learn how to compare strings in C++.<\/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. Using the strcmp() function in C++<\/h2>\n<p>C++ String has built-in functions for manipulating String data. The strcmp() function is a C library function used to compare two strings lexicographically.<\/p>\n<ul>\n<li>The input string must be a character array of C-style strings.<\/li>\n<li>strcmp() also compares strings in a case-sensitive form.<\/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>This function returns the following values depending on the matching items:<\/p>\n<ul>\n<li>Returns 0 if both strings are the same.<\/li>\n<li>If the character value of the first string is smaller compared to the second string input, it returns &lt; 0 (less than zero).<\/li>\n<li>When the second string in the comparison is larger, the results are &gt; 0 (greater than zero).<\/li>\n<\/ul>\n<p>Run the following code:<\/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>This produces the following output:<\/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) results in -9. The values of str_inp1 and str_inp2 are different.<\/p>\n<p>Run the following code:<\/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>This produces the following output:<\/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) returns 0. The values of str_inp1 and str_inp2 are the same.<\/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. Using the compare() function in C++<\/h2>\n<p>C++ has a built-in compare() function to compare two strings.<\/p>\n<p>The compare() function compares two strings:<\/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>This function returns the following values depending on the matching items:<\/p>\n<ul>\n<li>Returns 0 if both strings are the same.<\/li>\n<li>If the character value of the first string is smaller compared to the second string input, it returns &lt; 0 (less than zero).<\/li>\n<li>When the second string in the comparison is larger, the results are &gt; 0 (greater than zero).<\/li>\n<\/ul>\n<p>Run the following code:<\/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>In this example, str_inp1 and str_inp2 are compared with compare():<\/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>Both strings are lexically identical, so the function returns 0.<\/p>\n<p>Run the following code:<\/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>In this example, str_inp0 is compared to str_inp1:<\/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>Then str_inp0 is compared to str_inp2:<\/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>This code directly compares a string to another input string with the compare() function.<\/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. Relational operators in C++<\/h2>\n<p>C++ relational operators such as == (equals) and != (not equal) can be useful in comparing strings.<\/p>\n<p>Check if two values are equal:<\/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>Check if two values are not equal:<\/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\">Example 1: Using the C++ == operator<\/h5>\n<p>Run the following code:<\/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>Provide the values &quot;String 1&quot; and &quot;String 2&quot;:<\/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>The code compares two strings with ==.<\/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\">Example 2: Using the C++ != operator<\/h5>\n<p>Run the following code:<\/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>Provide the values &quot;String 1&quot; and &quot;String 2&quot;:<\/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>The code compares two strings with !=.<\/p>\n<h2 id=\"%d9%86%d8%aa%db%8c%d8%ac%d9%87\">Result<\/h2>\n<p>In this article, you learned about string comparison methods in C++. This included the String strcmp() function, the built-in compare() function, and the relational operators (==, !=).<\/p>","protected":false},"excerpt":{"rendered":"Introduction In this article, you will learn how to compare strings in C++. 1. 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