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  1. #include <iostream>
  2. #include <cstring>
  3. #include <algorithm>
  4. using namespace std;
  5.  
  6. int main() {
  7.  
  8.     // INITIALIZATION
  9.  
  10.     string a;   // Empty string
  11.     string b("Quora");
  12.     string c = "Quora";
  13.     string d = b;
  14.     string e(c);
  15.  
  16.     // INITIALIZING WITH C-STYLE STRING
  17.     char str[10] = "Quora";
  18.     string f = str;
  19.     string g(str);
  20.  
  21.  
  22.     // CHECK STRING IS EMPTY OR NOT
  23.     if (a.empty())
  24.         cout << "Empty string\n";
  25.  
  26.  
  27.     // FIND LENGTH OF STRING
  28.     int bLen = b.length();
  29.     // cout << bLen << endl;
  30.  
  31.  
  32.     // CONCATENATION OF STRING
  33.     string abc = b + d;
  34.  
  35.     // Note : For concatenation to work, atleast one of them must be <string> type
  36.     // string tN = "Does" + "not" + "work"  // compile time error
  37.  
  38.     string tY = string("This") + "will" + "work";
  39.     // tY = "This will work"
  40.  
  41.  
  42.  
  43.     // FIND A SUBSTRING
  44.  
  45.     // string.find() -> finds first occurence
  46.     // string.rfind() -> finds last occurence
  47.  
  48.     int found = tY.find("will");
  49.  
  50.     if (found == -1)
  51.         cout << "Not Found\n";
  52.     else
  53.         cout << "Found at index : " << found << endl;
  54.  
  55.  
  56.  
  57.     // MAKE THE STRING EMPTY
  58.     // tY.clear();
  59.  
  60.  
  61.     // ERASE ANY SUBSTRING 
  62.     // string.erase(index, length)
  63.  
  64.     tY.erase(0, 5);
  65.     // cout << tY << endl;
  66.  
  67.  
  68.     // STRING TO SUBSTRING
  69.     // string.substr(index, length)
  70.  
  71.     string subString = b.substr(1, 3);
  72.     // cout << subString << endl;
  73.  
  74.  
  75.  
  76.     // INSERT A STRING 
  77.     // string.insert(index, string)
  78.  
  79.     tY.insert(0, "Quora "); // inserts at beginning 
  80.     // cout << tY << endl;    
  81.  
  82.  
  83.     // COMPARE STRINGS
  84.     // all relational operator work on string
  85.     //  ==  !=  >  <  >=  <=  
  86.  
  87.     if (d == c)
  88.         cout << "Equal strings\n";
  89.  
  90.     // Alternatively
  91.     // s1.compare(s2) 
  92.  
  93.  
  94.  
  95.     // Compatibility of <string> with C-style string
  96.  
  97.     /********* string.c_str()  behaves as C-style string *******/
  98.  
  99.     int len = strlen(tY.c_str());
  100.     cout << len << endl; 
  101.  
  102.     string number = "12345";
  103.     int num = atoi(number.c_str());
  104.     cout << num << endl;
  105.  
  106.  
  107.     // Whenever char * is required rather than const char * USE
  108.     // const_cast<char *> (string.c_str())
  109.  
  110.     // Splitting a string based on a tokenizer
  111.     // strtok(char *, const char *)
  112.  
  113.      string sentence = "Today is Monday 29-07-14";
  114.      char *p = strtok(const_cast<char *>(sentence.c_str()), " ");
  115.      while (p != NULL) {
  116.           cout << p << endl;
  117.           p = strtok(NULL, " ");
  118.      }
  119.  
  120.     return 0;
  121. }
Success #stdin #stdout 0s 3232KB
comments (?)
stdin
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Standard input is empty
stdout
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Empty string
Found at index : 4
Equal strings
13
12345
Today
is
Monday
29-07-14
https://ideone.com/hZzJUs
language:
C++ (gcc 8.3)
created:
8 years ago
visibility:
public

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