strings

047.cpp

@@ -0,0 +1,39 @@
+#include <iostream>
+#include <set>
+
+using namespace std;
+
+int main() {
+    set<char> s;
+
+    s.insert('a');
+    s.insert('b');
+    s.insert('a');
+    s.insert('c');
+
+    for (set<char>::const_iterator iter = s.begin(); iter != s.end(); iter++) {
+        cout << *iter << endl;
+    }
+
+    cout << "\n";
+
+    s.erase('b');
+
+    for (set<char>::const_iterator iter = s.begin(); iter != s.end(); iter++) {
+        cout << *iter << endl;
+    }
+
+    if (s.find('a') != s.end()) {
+        cout << "a exists" << "\n";
+    }
+    else {
+        cout << "a does not exist" << "\n";
+    }
+
+    if (s.find('b') != s.end()) {
+        cout << "b exists" << "\n";
+    }
+    else {
+        cout << "b does not exist" << "\n";
+    }
+}

048.cpp

@@ -0,0 +1,16 @@
+#include <iostream>
+#include <string>
+#include <map>
+
+using namespace std;
+
+int main() {
+    map<string, double> m;
+
+    m["pi"] = 3.14;
+    m["e"] = 2.71;
+
+    for (map<string, double>::const_iterator iter = m.begin(); iter != m.end(); iter++) {
+        cout << iter->first << '=' << iter->second << "\n";
+    }
+}

049.cpp

@@ -0,0 +1,28 @@
+#include <iostream>
+#include <string>
+
+using namespace std;
+
+int main() {
+    string s = "abcdef";
+
+    for (string::const_iterator i = s.begin(); i != s.end(); i++) 
+        cout << *i << "\n";
+
+    for (auto i = s.begin(); i != s.end(); i++)
+        cout << *i << "\n";
+
+    for (auto x : s)
+        cout << x << "\n";
+
+    cout << s.length() << ' ' << s.size() << "\n";
+
+    for (int i = 0; i != s.length(); i++)
+        cout << s[i] << "\n";
+
+    if (s.find('x') != string::npos) cout << "x in string\n";
+    else cout << "x not in string\n";
+
+    if (s.find('e') != string::npos) cout << "e in string\n";
+    else cout << "e not in string\n";
+}

050.cpp

@@ -0,0 +1,28 @@
+#include <iostream>
+#include <iomanip>
+
+using namespace std;
+
+int main() {
+    cout << setw(10) << 8 << endl;
+    cout << 9 << endl;
+
+    cout.width(10);
+    cout << 8 << endl;
+    cout << 9 << endl;
+
+    cout << setprecision(4) << 3.1415926 << "\n";
+
+    cout << setw(10) << setfill('_') << "Yo" << endl;
+    cout << setw(10) << setfill('_') << "Yo\n";
+
+    cout << setbase(16) << 254 << endl;
+
+    cout << hex << 254 << endl;
+    cout << setiosflags(std::ios::showbase | std::ios::uppercase) << 254 << endl;
+
+    cout << 123 << endl;
+
+    cout << resetiosflags(std::ios::hex | std::ios::showbase | std::ios::uppercase) << 254 << endl;
+    cout << 123 << endl;
+}

README.txt

@@ -274,12 +274,28 @@ STL
             pop
     Associative containers
         set
+            insert
+            erase
+            find
         map
-
-
-
-
-strings
+            iter->first, iter->second
+    <string>
+        iterators (and rbegin, begin, end, rend)
+        auto instead of iterators
+        for (auto x : s)
+        size, length
+        [], at
+        +, +=
+        c_str
+        find, string::npos
+    <iomanip>
+        setw
+        setfill
+        setbase
+        setprecision
+        > exersise: print table
+        hex
+        setiosflags/resetiosflags (std::ios::showbase | std::ios::uppercase);
 
 io
 iomanips