Add source code of Lesson 4

Bai thuc hanh so 4/bai1.cpp

@@ -0,0 +1,21 @@
+#include <iostream>
+
+using namespace std;
+
+int main(){
+  int n;
+  float a[1000];
+  cout << "Nhap so phan tu cua day: ";
+  cin >> n;
+  for (int i=0;i<n;i++){
+    cout << "Nhap phan thu thu " << i+1 << ": ";
+    cin >> a[i];
+  }
+  float min=a[0],max=a[0];
+  for (int i=1;i<n;i++){
+    if (a[i]>max) max=a[i];
+    if (a[i]<min) min=a[i];
+  }
+  cout << "Phan tu nho nhat trong day la " << min << " va phan tu lon nhat trong day la " << max << "\n";
+  return 0;
+}

Bai thuc hanh so 4/bai2.cpp

@@ -0,0 +1,29 @@
+#include <iostream>
+
+using namespace std;
+
+int main(){
+  int n;
+  cout << "Nhap vao so phan tu cua mang: ";
+  cin >> n;
+  int a[n];
+  for (int i=0;i<n;i++){
+    cout << "Nhap phan thu thu " << i+1 << ": ";
+    cin >> a[i];
+  }
+  for (int j=n-1;j>=1;j--){
+    for (int i=0;i<=j-1;i++){
+      if (a[i]>a[i+1]){
+        int tg=a[i];
+        a[i]=a[i+1];
+        a[i+1]=tg;
+      }
+    }
+  }
+  cout << "Mang sau khi da sap xep tang dan la: \n";
+  for (int i=0;i<n;i++){
+    cout << a[i] << " ";
+  }
+  cout << "\n";
+  return 0;
+}

Bai thuc hanh so 4/bai3.cpp

@@ -0,0 +1,24 @@
+#include <iostream>
+
+using namespace std;
+
+int main(){
+  int n;
+  cout << "Nhap so chieu cua vector: ";
+  cin >> n;
+  int x[n],y[n];
+  for (int i=0;i<n;i++){
+    cout << "Nhap x[" << i+1 << "]: ";
+    cin >> x[i];
+  }
+  for (int i=0;i<n;i++){
+    cout << "Nhap y[" << i+1 << "]: ";
+    cin >> y[i];
+  }
+  int ans=0;
+  for (int i=0;i<n;i++){
+    ans+=x[i]*y[i];
+  }
+  cout << "Tich vo huong cua hai vector x va y la " << ans << "\n";
+  return 0;
+}

Bai thuc hanh so 4/bai4.cpp

@@ -0,0 +1,50 @@
+#include <iostream>
+
+using namespace std;
+
+int main(){
+  int n;
+  cout << "Nhap vao so phan tu cua mang: ";
+  cin >> n;
+  int a[n];
+  for (int i=0;i<n;i++){
+    cout << "Nhap phan thu thu " << i+1 << ": ";
+    cin >> a[i];
+  }
+  float min=a[0],max=a[0];
+  for (int i=1;i<n;i++){
+    if (a[i]>max) max=a[i];
+    if (a[i]<min) min=a[i];
+  }
+  for (int i=0;i<n;i++){
+    if (a[i]==min){
+      a[i]=9999;
+    }
+    if (a[i]==max){
+      a[i]=-9999;
+    }
+  }
+  for (int j=n-1;j>=1;j--){
+    for (int i=0;i<=j-1;i++){
+      if (a[i]>a[i+1]){
+        int tg=a[i];
+        a[i]=a[i+1];
+        a[i+1]=tg;
+      }
+    }
+  }
+  for (int i=0;i<n;i++){
+    if (a[i]==9999){
+      a[i]=min;
+    }
+    if (a[i]==-9999){
+      a[i]=max;
+    }
+  }
+  cout << "Mang sau khi sap xep theo yeu cau cua de bai la: \n";
+  for (int i=0;i<n;i++){
+    cout << a[i] << " ";
+  }
+  cout << "\n";
+  return 0;
+}

Bai thuc hanh so 4/bai5.cpp

@@ -0,0 +1,71 @@
+#include <iostream>
+
+using namespace std;
+
+bool tang(int a[],int n){
+  for (int i=0;i<=n-2;i++){
+    if (a[i]>a[i+1]){
+      return false;
+    }
+  }
+  return true;
+}
+
+bool giam(int a[],int n){
+  for (int i=0;i<=n-2;i++){
+    if (a[i]<a[i+1]){
+      return false;
+    }
+  }
+  return true;
+}
+
+bool tangngat(int a[],int n){
+  for (int i=0;i<=n-2;i++){
+    if (a[i]>=a[i+1]){
+      return false;
+    }
+  }
+  return true;
+}
+
+bool giamngat(int a[],int n){
+  for (int i=0;i<=n-2;i++){
+    if (a[i]<=a[i+1]){
+      return false;
+    }
+  }
+  return true;
+}
+
+int main(){
+  int n;
+  cout << "Nhap vao so phan tu cua mang: ";
+  cin >> n;
+  int a[n];
+  for (int i=0;i<n;i++){
+    cout << "Nhap phan thu thu " << i+1 << ": ";
+    cin >> a[i];
+  }
+  if (tangngat(a,n)==true){
+    cout << "Day so tren tang ngat.\n";
+    return 0;
+  }
+  else if (tang(a,n)==true){
+    cout << "Day so tren tang.\n";
+    return 0;
+  }
+
+  if (giamngat(a,n)==true){
+    cout << "Day so tren giam ngat.\n";
+    return 0;
+  }
+  else if (giam(a,n)==true){
+    cout << "Day so tren giam.\n";
+    return 0;
+  }
+  else{
+    cout << "Day so tren chua duoc sap.\n";
+    return 0;
+  }
+}

Bai thuc hanh so 4/bai6.cpp

@@ -0,0 +1,29 @@
+#include <iostream>
+#include <math.h>
+
+using namespace std;
+
+int main(){
+  int n;
+  cout << "Nhap so chieu cua vector: ";
+  cin >> n;
+  int x[n];
+  for (int i=0;i<n;i++){
+    cout << "Nhap x[" << i+1 << "]: ";
+    cin >> x[i];
+  }
+
+  float c1=0,c2=0,c0=0,cinf=-99999;
+  for (int i=0;i<n;i++){
+    c1+=abs(x[i]);
+    c2+=x[i]*x[i];
+    if (x[i]!=0) c0++;
+    if (x[i]>cinf) cinf=x[i];
+  }
+  c2=sqrt(c2);
+  cout << "Chuan 1 cua X la " << c1 << "\n";
+  cout << "Chuan 2 cua X la " << c2 << "\n";
+  cout << "Chuan vo cung cua X la " << cinf << "\n";
+  cout << "Chuan 0 cua X la " << c0 << "\n";
+  return 0;
+}