diff --git a/base/CMakeLists.txt b/base/CMakeLists.txt
index 7d1aca0..4460b71 100644
--- a/base/CMakeLists.txt
+++ b/base/CMakeLists.txt
@@ -92,4 +92,29 @@ add_executable(list stl/list.cpp)
 add_executable(setops stl/setops.cpp)
 add_executable(multimap stl/multimap.cpp)
 add_executable(functor stl/functor.cpp)
-add_executable(funadap stl/funadap.cpp)
\ No newline at end of file
+add_executable(funadap stl/funadap.cpp)
+add_executable(strgst1 stl/strgst1.cpp)
+add_executable(listrmv stl/listrmv.cpp)
+add_executable(usealgo stl/usealgo.cpp)
+add_executable(valvect stl/valvect.cpp)
+add_executable(vslice stl/vslice.cpp)
+add_executable(ilist stl/ilist.cpp)
+add_executable(write io/write.cpp)
+add_executable(defaults io/defaults.cpp)
+add_executable(manip io/manip.cpp)
+add_executable(width io/width.cpp)
+add_executable(fill io/fill.cpp)
+add_executable(precise io/precise.cpp)
+add_executable(showpt io/showpt.cpp)
+add_executable(setf io/setf.cpp)
+add_executable(iomanip io/iomanip.cpp)
+add_executable(check_it io/check_it.cpp)
+add_executable(cinexcp io/cinexcp.cpp)
+add_executable(get_gun io/get_gun.cpp)
+add_executable(peeker io/peeker.cpp)
+add_executable(truncate io/truncate.cpp)
+add_executable(filleio io/filleio.cpp)
+add_executable(count io/count.cpp)
+add_executable(append io/append.cpp)
+add_executable(strout io/strout.cpp)
+add_executable(strin io/strin.cpp)
\ No newline at end of file
diff --git a/base/stl/ilist.cpp b/base/stl/ilist.cpp
index 14b668d..3e57c6c 100644
--- a/base/stl/ilist.cpp
+++ b/base/stl/ilist.cpp
@@ -3,12 +3,41 @@
 //
 
 #include <iostream>
-#include "ilist.h"
+#include <initializer_list>
 
 using namespace std;
 
-int main(){
-    
+inline double sum(initializer_list<double> il);
+
+inline double average(const initializer_list<double> &ril);
+
+int main() {
+
+    cout << "List 1: sum = " << sum({2, 3, 4}) << ", ave = " << average({2, 3, 4}) << endl;
+    initializer_list<double> dl = {1.1, 2.2, 3.3, 4.4, 5.5};
+    cout << "List 2: sum = " << sum(dl) << ", ave = " << average(dl) << endl;
+    dl = {16.0, 25.0, 36.0, 40.0, 64.0};
+    cout << "List 3: sum = " << sum(dl) << ", ave = " << average(dl) << endl;
     return 0;
 }
 
+inline double sum(initializer_list<double> il) {
+    double tot = 0;
+    for (auto p = il.begin(); p != il.end(); p++) {
+        tot += *p;
+    }
+    return tot;
+}
+
+inline double average(const initializer_list<double> &ril) {
+    double tot = 0;
+    int n = ril.size();
+    double ave = 0.0;
+    if (n > 0) {
+        for (auto p = ril.begin(); p != ril.end(); p++) {
+            tot += *p;
+        }
+        ave = tot / n;
+    }
+    return ave;
+}
\ No newline at end of file
diff --git a/base/stl/listrmv.cpp b/base/stl/listrmv.cpp
index 3c75e86..3ce7c6d 100644
--- a/base/stl/listrmv.cpp
+++ b/base/stl/listrmv.cpp
@@ -3,12 +3,43 @@
 //
 
 #include <iostream>
-#include "listrmv.h"
+#include <list>
+#include <algorithm>
 
 using namespace std;
 
-int main(){
-    
+void Show(int);
+
+const int LIM = 10;
+
+int main() {
+
+    int ar[LIM]{
+            4, 5, 4, 2, 2, 3, 4, 8, 1, 4
+    };
+    list<int> la(ar, ar + LIM);
+    list<int> lb(la);
+    cout << "Original list contents:\n\t";
+    for_each(la.begin(), la.end(), Show);
+    cout << endl;
+    la.remove(4);
+    cout << "After using the remove() methond:\n";
+    cout << "la:\t";
+    for_each(la.begin(), la.end(), Show);
+    cout << endl;
+    auto last = remove(lb.begin(), lb.end(), 4);
+    cout << "After using the remove() function:\n";
+    cout << "lb:\t";
+    for_each(lb.begin(), lb.end(), Show);
+    cout << endl;
+    lb.erase(last, lb.end());
+    cout << "After using the earse() methond:\n";
+    cout << "lb:\t";
+    for_each(lb.begin(), lb.end(), Show);
+    cout << endl;
     return 0;
 }
 
+void Show(int v) {
+    cout << v << ' ';
+}
\ No newline at end of file
diff --git a/base/stl/strgst1.cpp b/base/stl/strgst1.cpp
index 6437b6a..c79086f 100644
--- a/base/stl/strgst1.cpp
+++ b/base/stl/strgst1.cpp
@@ -10,6 +10,16 @@ using namespace std;
 
 int main() {
 
-
+    string letters;
+    cout << "Enter the letter grouping (quit to quit): ";
+    while (cin >> letters && letters != "quit") {
+        cout << "Permutations of " << letters << endl;
+        sort(letters.begin(), letters.end());
+        cout << letters << endl;
+        while (next_permutation(letters.begin(), letters.end()))
+            cout << letters << endl;
+        cout << "Enter next sequence (quit to quit): ";
+    }
+    cout << "Done.\n";
     return 0;
 }
diff --git a/base/stl/usealgo.cpp b/base/stl/usealgo.cpp
index 78427b1..0fa253a 100644
--- a/base/stl/usealgo.cpp
+++ b/base/stl/usealgo.cpp
@@ -3,12 +3,60 @@
 //
 
 #include <iostream>
-#include "usealgo.h"
+#include <string>
+#include <vector>
+#include <set>
+#include <map>
+#include <iterator>
+#include <algorithm>
+#include <cctype>
 
 using namespace std;
 
-int main(){
-    
+char toLower(char ch) {
+    return tolower(ch);
+}
+
+string &ToLower(string &st);
+
+void display(const string &s);
+
+int main() {
+
+    vector<string> words;
+    cout << "Enter words(enter quit to quit) :\n";
+    string input;
+    while (cin >> input && input != "quit")
+        words.push_back(input);
+
+    cout << "You entered the following words:\n";
+    for_each(words.begin(), words.end(), display);
+    cout << endl;
+
+    set<string> wordset;
+    transform(words.begin(), words.end(), insert_iterator<set<string> >(wordset, wordset.begin()), ToLower);
+    cout << "\nAlphabetic list of words:\n";
+    for_each(wordset.begin(), wordset.end(), display);
+    cout << endl;
+
+    map<string, int> wordmap;
+    set<string>::iterator si;
+    for (si = wordset.begin(); si != wordset.end(); si++) {
+        wordmap[*si] = count(words.begin(), words.end(), *si);
+    }
+
+    cout << "\nWord frequency:\n";
+    for (si = wordset.begin(); si != wordset.end(); si++) {
+        cout << *si << " : " << wordmap[*si] << endl;
+    }
     return 0;
 }
 
+string &ToLower(string &st) {
+    transform(st.begin(), st.end(), st.begin(), toLower);
+    return st;
+}
+
+void display(const string &s) {
+    cout << s << " ";
+}
\ No newline at end of file
diff --git a/base/stl/valvect.cpp b/base/stl/valvect.cpp
index 91fe784..1254d0d 100644
--- a/base/stl/valvect.cpp
+++ b/base/stl/valvect.cpp
@@ -3,12 +3,37 @@
 //
 
 #include <iostream>
-#include "valvect.h"
-
+#include <valarray>
+#include <vector>
+#include <algorithm>
 using namespace std;
 
-int main(){
-    
+int main() {
+    vector<double> data;
+    double temp;
+
+    cout<<"Enter numbers (<=0 to quit):\n";
+    while (cin>>temp && temp >0)
+        data.push_back(temp);
+    sort(data.begin(), data.end());
+    int size =data.size();
+    valarray<double> numbers(size);
+    for (int i = 0; i < size; ++i) {
+        numbers[i] = data[i];
+    }
+    valarray<double> sq_rts(size);
+    sq_rts = sqrt(numbers);
+    valarray<double> result(size);
+    result = numbers + 2.0 * sq_rts;
+    cout.setf(ios_base::fixed);
+    cout.precision(4);
+    for (int i = 0; i < size; ++i) {
+        cout.width(8);
+        cout<<numbers[i]<<": ";
+        cout.width(8);
+        cout<<result[i]<<endl;
+    }
+    cout << "done\n";
     return 0;
 }
 
diff --git a/base/stl/vslice.cpp b/base/stl/vslice.cpp
index bca685e..e927bcf 100644
--- a/base/stl/vslice.cpp
+++ b/base/stl/vslice.cpp
@@ -3,12 +3,49 @@
 //
 
 #include <iostream>
-#include "vslice.h"
+#include <valarray>
+#include <cstdlib>
 
 using namespace std;
 
-int main(){
-    
+const int SIZE = 12;
+typedef valarray<int> vint;
+
+void show(const vint &v, int cols);
+
+int main() {
+
+    vint valint(SIZE);
+    for (int i = 0; i < SIZE; ++i) {
+        valint[i] = rand() % 10;
+    }
+    cout << "Original array:\n";
+    show(valint, 3);
+    vint vcol(valint[slice(1, 4, 3)]);
+    cout << "Second column:\n";
+    show(vcol, 1);
+    vint vrow(valint[slice(3, 3, 1)]);
+    cout << "Second row:\n";
+    show(vrow, 3);
+    valint[slice(2, 4, 3)] = 10;
+    cout << "Set last column to 10:\n";
+    show(valint, 3);
+    cout << "Set first column to sum of next two:\n";
+    valint[slice(0, 4, 3)] = vint(valint[slice(1, 4, 3)]) + vint(valint[slice(2, 4, 3)]);
+    show(valint, 3);
     return 0;
 }
 
+void show(const vint &v, int cols) {
+    int lim = v.size();
+    for (int i = 0; i < lim; ++i) {
+        cout.width(3);
+        cout << v[i];
+        if (i % cols == cols - 1)
+            cout << endl;
+        else
+            cout << ' ';
+    }
+    if (lim % cols != 0)
+        cout << endl;
+}
\ No newline at end of file