Add source code of Lesson 6

Bai thuc hanh so 6/bai1.cpp

@@ -0,0 +1,25 @@
+#include <iostream>
+#include <string>
+
+using namespace std;
+
+int main(){
+  string s;
+  cout << "Nhap xau ki tu: ";
+  getline(cin,s);
+  int count=0;
+  for (int i=0;i<s.length();i++){
+    if (s[i]>='a' && s[i]<='z'){
+      count++;
+    }
+  }
+  cout << "Xau vua nhap co " << count << " chu cai thuong.\n";
+  for (int i=0;i<s.length();i++){
+    if (s[i]=='a'){
+      s.erase(i,1);
+      i--;
+    }
+  }
+  cout << "Xau sau khi xoa moi ki tu 'a' la: " << s << "\n";
+  return 0;
+}

Bai thuc hanh so 6/bai2.cpp

@@ -0,0 +1,28 @@
+#include <iostream>
+#include <string>
+
+using namespace std;
+
+int main(){
+  string s;
+  cout << "Nhap xau ki tu: ";
+  getline(cin,s);
+  bool ans=true;
+  int n=s.length(),words=1;
+  for (int i=0;i<n-1;i++){
+    if (s[i]==' ' && s[i+1]==' '){
+      ans=false;
+      break;
+    }
+    if (s[i]==' ' && s[i+1]!=' '){
+      words++;
+      if (words>10){
+        ans=false;
+        break;
+      }
+    }
+  }
+  if (ans==true) cout << "Xau tren hop le.\n";
+  else cout << "Xau tren khong hop le.\n";
+  return 0;
+}

Bai thuc hanh so 6/bai3.cpp

@@ -0,0 +1,19 @@
+#include <iostream>
+#include <string>
+
+using namespace std;
+
+int main(){
+  string s;
+  cout << "Nhap xau ki tu: ";
+  getline(cin,s);
+  char c;
+  cout << "Nhap ki tu c: ";
+  cin >> c;
+  int k;
+  cout << "Nhap so nguyen k: ";
+  cin >> k;
+  s.insert(k,1,c);
+  cout << "Xau sau khi chen them ki tu " << c << " vao vi tri " << k << " la: " << s << "\n";
+  return 0;
+}

Bai thuc hanh so 6/bai4.cpp

@@ -0,0 +1,38 @@
+#include <iostream>
+#include <stack>
+#include <string>
+
+using namespace std;
+
+bool arePair(char opening,char closing){
+	if (opening == '(' && closing == ')') return true;
+	else if (opening == '{' && closing == '}') return true;
+	else if (opening == '[' && closing == ']') return true;
+	return false;
+}
+
+bool balanced(string str){
+	stack <char> S;
+	for (int i=0;i<str.length();i++){
+		if(str[i] == '(' || str[i] == '{' || str[i] == '[')
+			S.push(str[i]);
+		else if(str[i] == ')' || str[i] == '}' || str[i] == ']'){
+			if (S.empty() || !arePair(S.top(),str[i]))
+				return false;
+			else
+				S.pop();
+		}
+	}
+	return S.empty() ? true:false;
+}
+
+int main(){
+	string s;
+	cout << "Nhap xau dau ngoac: ";
+	cin >> s;
+	if (balanced(s))
+		cout << "Hop le.\n";
+	else
+		cout << "Khong hop le.\n";
+  return 0;
+}

Bai thuc hanh so 6/bai5.cpp

@@ -0,0 +1,30 @@
+#include <iostream>
+#include <stdlib.h>
+
+using namespace std;
+
+int main(){
+  int n;
+  cout << "Nhap so phan tu cua mang: ";
+  cin >> n;
+  int *a=new int[n];
+  for (int i=0;i<n;i++){
+    cout << "Nhap phan tu thu " << i+1 << " cua mang: ";
+    cin >> *(a+i);
+  }
+  int k=n;
+  for (int i=0;i<n;i++){
+    if (*(a+i)%2!=0){
+      k++;
+      a=(int*) realloc(a,k*sizeof(int));
+      *(a+k-1)=*(a+i);
+    }
+  }
+  n=k;
+  cout << "Mang sau khi sao chep cac phan tu le vao cuoi la:\n";
+  for (int i=0;i<n;i++){
+    cout << *(a+i) << " ";
+  }
+  cout << "\n";
+  return 0;
+}

Bai thuc hanh so 6/bai6.cpp

@@ -0,0 +1,34 @@
+#include <iostream>
+#include <stdlib.h>
+
+using namespace std;
+
+int main(){
+  int n;
+  cout << "Nhap so phan tu cua mang: ";
+  cin >> n;
+  int *a;
+  a = new int[n];
+  for (int i=0;i<n;i++){
+    cout << "Nhap phan tu thu " << i+1 << " cua mang: ";
+    cin >> *(a+i);
+  }
+
+  for (int i=0;i<n;i++){
+    if (*(a+i)%2==0){
+      n--;
+      for (int j=i;j<n;j++){
+        *(a+j)=*(a+j+1);
+      }
+      a = (int*) realloc(a,n*sizeof(int));
+      i--;
+    }
+  }
+
+  cout << "Mang sau khi xoa het cac phan tu chan la:\n";
+  for (int i=0;i<n;i++){
+    cout << *(a+i) << " ";
+  }
+  cout << "\n";
+  return 0;
+}