{"id":7680,"date":"2022-10-16T10:43:37","date_gmt":"2022-10-16T10:43:37","guid":{"rendered":"https:\/\/www.jquery-az.com\/?p=7680"},"modified":"2024-01-30T18:30:44","modified_gmt":"2024-01-30T18:30:44","slug":"cpp-string-find-function","status":"publish","type":"post","link":"https:\/\/www.jquery-az.com\/cpp-string-find-function\/","title":{"rendered":"5 Examples to Learn C++ String find() Function"},"content":{"rendered":"

\"Exploring<\/p>\n

\n

An Introduction to C++ String Find Function<\/strong><\/h3>\n
    \n
  • The string find() function in C++ is used to find a substring<\/strong> in the given string<\/strong>.<\/li>\n
  • The find() function belongs to the C++ string class<\/strong>.<\/li>\n
  • We must include <string><\/strong><\/em> in the header<\/em> section (see the programs below)<\/li>\n
  • For example, we have the string \u201cThis is C++ tutorial\u201d.<\/li>\n
  • We want to find out if the above string contains the word \u201ctutorial\u201d or not.<\/li>\n
  • In the find() function of C++, we can specify that string and provide the word \u201ctutorial\u201d.<\/li>\n
  • The find method returns the position of the word if found.<\/li>\n
  • If the position of the given word\/character is found \u2013 that means the word exists \u2013 otherwise, it is not.<\/li>\n
  • If the searched string is not found the find method returns string::npos<\/em><\/strong>. npos is the static member constant value with the greatest value for an element of size_t<\/em><\/strong>.<\/li>\n<\/ul>\n<\/div>\n

    Syntax of using C++ find() function<\/strong><\/h3>\n

    Following is the syntax for using the find() function:<\/p>\n

    str.find(seq, position, count)<\/div>\n

    Following are the parameters description of the find function:<\/strong><\/p>\n\n\n\n\n\n\n\n
    Parameter<\/strong><\/td>\nDescription<\/strong><\/td>\n<\/tr>\n
    Str<\/strong><\/td>\nThe string object. The string you want to search in.<\/td>\n<\/tr>\n
    Seq<\/strong><\/td>\nIt\u2019s the sequence of characters that you want to search in the str.<\/td>\n<\/tr>\n
    Pos<\/strong><\/td>\n\n
      \n
    • The position or index in the str to start the search.<\/li>\n
    • The default is 0.<\/li>\n
    • It’s optional.<\/li>\n<\/ul>\n<\/td>\n<\/tr>\n
    Count<\/strong><\/td>\n\n
      \n
    • Number of characters that must match in the str.<\/li>\n
    • The default is the length of the seq.<\/li>\n
    • This is also an optional parameter.<\/li>\n<\/ul>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

      Now let us look at a few examples of using the string find function with one or more parameters.<\/p>\n

      An example of C++ find with a single parameter<\/strong><\/h3>\n

      In this example, we only used the required parameter in the find() function. We have created a string (str1) and used it with the find method.<\/p>\n

      Another string variable is declared (str2) which is used as the sequence to search in the find method. See the code and output:<\/p>\n

      #include <iostream>\r\n\r\n#include <string>\r\n\r\nusing namespace std;\r\n\r\nint main(){\r\n\r\n\u00a0 \/\/Creating string object to search in\r\n\r\n\u00a0 string str1 = \"This is C++ tutorial\";\r\n\r\n\r\n\u00a0 \/\/substring or seq to search in str1\r\n\r\n\u00a0 string str2 = \"tutorial\";\r\n\r\n\u00a0 \/\/Using find function\r\n\r\n\u00a0 cout <<\"The tutorial starts at: \" << str1.find(str2);\r\n\r\n}<\/pre>\n
      Output:<\/strong><\/p>\n
      \"CPP-string-find\"<\/p>\n
      What if a given sequence occurs twice or more?<\/strong><\/h3>\n
      In this example, we searched for a character \u2018s\u2019<\/strong> in the given string. It occurs twice in the sentence. See what it outputs:<\/p>\n
      #include <iostream>\r\n\r\n#include <string>\r\n\r\nusing namespace std;\r\n\r\nint main(){\r\n\r\n\u00a0 \/\/Creating string object to search in\r\n\r\n\u00a0 string str1 = \"Hang on, I am coming!\";\r\n\r\n\u00a0 \/\/substring or seq to search in str1\r\n\r\n\u00a0 string str2 = \"o\";\r\n\r\n\u00a0 \/\/Using find function\r\n\r\n\u00a0 cout <<\"The o starts at: \" << str1.find(str2);\r\n\r\n}<\/pre>\n
      Output:<\/strong><\/p>\n
      \"CPP-find-twice\"<\/p>\n
      An example with sequence and position parameter<\/strong><\/h3>\n
        \n
      • In the program below, we used two parameters in the find function.<\/li>\n
      • The first is the sequence (just like the above example i.e. str2) and the second is the position parameter.<\/li>\n<\/ul>\n
        First, have a look at the code and output below:<\/p>\n
        #include <iostream>\r\n\r\n#include <string>\r\n\r\nusing namespace std;\r\n\r\n\r\nint main(){\r\n\r\n\u00a0 \/\/Creating string object to search in\r\n\r\n\u00a0 string str1 = \"Have a nice day!\";\r\n\r\n\u00a0 \/\/substring or seq to search in str1\r\n\r\n\u00a0 string str2 = \"nice\";\r\n\r\n\r\n\u00a0 \/\/Using find function with position parameter\r\n\r\n\u00a0 cout <<\"The nice starts at: \" << str1.find(str2, 3);\r\n\r\n\r\n}<\/pre>\n
        First output as we set position 3:<\/p>\n
        \"CPP-string-find-pos\"<\/p>\n
        When we set position 8:<\/strong><\/p>\n
        #include <iostream>\r\n\r\n#include <string>\r\n\r\nusing namespace std;\r\n\r\n\r\nint main(){\r\n\r\n\u00a0 \/\/Creating string object to search in\r\n\r\n\u00a0 string str1 = \"Have a nice day!\";\r\n\r\n\r\n\u00a0 \/\/substring or seq to search in str1\r\n\r\n\u00a0 string str2 = \"nice\";\r\n\r\n\r\n\u00a0 \/\/Using find function with position parameter\r\n\r\n\u00a0 cout <<\"The nice starts at: \" << str1.find(str2, 8);\r\n\r\n}<\/pre>\n
        \"CPP-string-find-pos-2\"<\/p>\n
        \n
          \n
        • As sequence\/word \u201cnice\u201d starts at position 7. In the first program, we see the output as 7.<\/li>\n
        • However, in the second program, we set the searching position to start at 8.<\/li>\n
        • As the find function was unable to find the word \u201cnice\u201d from position 8, so it returned string::npos<\/em><\/strong>. Which is described in the first section.<\/li>\n<\/ul>\n<\/div>\n
          What if the sequence occurs twice?<\/strong><\/h3>\n
          We will search for the letter \u2018o\u2019 in this example. It occurs twice in the given sentence. However, the position is given so the first occurrence should be bypassed.<\/p>\n
          Let us see the output:<\/p>\n
          #include <iostream>\r\n\r\n#include <string>\r\n\r\nusing namespace std;\r\n\r\n\r\n\r\nint main(){\r\n\r\n\u00a0 \/\/Creating string object to search in\r\n\r\n\u00a0 string str1 = \"Hang on, I am coming!\";\r\n\r\n\r\n\r\n\u00a0 \/\/substring or seq to search in str1\r\n\r\n\u00a0 string str2 = \"o\";\r\n\r\n\r\n\r\n\u00a0 \/\/Using find function\r\n\r\n\u00a0 cout <<\"The o starts at: \" << str1.find(str2, 6);\r\n\r\n\r\n}<\/pre>\n
          Output:<\/strong><\/p>\n
          \"CPP-find-twice-pos\"<\/p>\n
          You saw though the first occurrence is at position 5, it did not return. The reason is we set position 6. So it returned the next occurrence of \u2018s\u2019 which is 15.<\/p>\n
          Using all three parameters example<\/strong><\/h3>\n
          In the following program, we also used a third optional parameter i.e., count<\/strong>. See the code and output below:<\/p>\n
          #include <iostream>\r\n\r\n#include <string>\r\n\r\nusing namespace std;\r\n\r\n\r\n\r\nint main(){\r\n\r\n\u00a0 \/\/Creating string object to search in\r\n\r\n\u00a0 string str1 = \"Have a nice day!\";\r\n\r\n\r\n\r\n\u00a0 \/\/Using find function with position and count parameter\r\n\r\n\u00a0 cout <<\"The nice starts at: \" << str1.find(\"nicee\", 7, 3);\r\n\r\n\r\n}<\/pre>\n
          Output:<\/strong><\/p>\n
          \"CPP-string-find-count\"<\/p>\n
          `<\/p>\n","protected":false},"excerpt":{"rendered":"
          The string find() function in C++ is used to find a substring in the given string.
          \nThe find() function belongs to the C++ string class.
          \nWe must include  in the header section<\/p>\n","protected":false},"author":1,"featured_media":12342,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[140],"tags":[],"yoast_head":"\n5 Examples to Learn C++ String Find Function<\/title>\n<meta name=\"description\" content=\"The string find() function in C++ is used to find a substring in the given string.The find() function belongs to the C++ string class.We must include in the header section\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.jquery-az.com\/cpp-string-find-function\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"5 Examples to Learn C++ String Find Function\" \/>\n<meta property=\"og:description\" content=\"The string 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