Create string_example.cpp

encrypted-def · web-flow · commit 02747ff74cf7 · 2022-03-02T20:23:29.000+09:00
diff --git a/0x1E/string_example.cpp b/0x1E/string_example.cpp
@@ -0,0 +1,43 @@
+#include <bits/stdc++.h>
+using namespace std;
+
+vector<string> split(string s, string sep){
+  vector<string> ret;
+  int pos = 0;
+  while(pos < s.size()){
+    int nxt_pos = s.find(sep, pos);
+    if(nxt_pos == -1) nxt_pos = s.size();
+    if(nxt_pos - pos > 0)
+      ret.push_back(s.substr(pos, nxt_pos - pos));
+    pos = nxt_pos + sep.size();
+  }
+  return ret;
+}
+
+int main(){
+  string s = "hello";
+  s += " BKD!"; // hello BKD!
+  cout << s.size() << '\n'; // 10
+  cout << s.substr(2, 3) << '\n'; // llo
+  cout << s[1] << '\n'; // e
+  s.replace(6, 4, "guys"); // hello guys
+  cout << s << '\n';
+  int it = s.find("guys"); // 6
+  s.replace(it, 4, "everyone"); // hello everyone
+  cout << s << '\n';
+  s.erase(7, 6); // hello ee
+  cout << s << '\n';
+  s[6] = 'm'; // hello me
+  cout << s << '\n';
+  s.insert(0, "say ");// say hello me
+  cout << s << '\n';
+  if(s.find("to") == string::npos) // string::npos == -1
+    cout << "'to' is not in string 's'\n";
+  vector<string> chunks1 = split("welcome to the black parade", " ");
+  // welcome/to/the/black/parade/
+  for(auto chunk : chunks1) cout << chunk << '/';
+  cout << '\n';
+  vector<string> chunks2 = split("b*!*ac*!*e*!*y*!*", "*!*");
+  // b/ac/a/y/
+  for(auto chunk : chunks2) cout << chunk << '/';
+}
