Program 1.

1
#include<stdio.h>

int main(){

char ch; // Store input character

printf("Xin moi nhap vao ky tu: ");

scanf("%c",&ch);

printf("\nMa ASCII cua ky tu vua nhap la: %d",ch);

printf("\nMa co so 8 cua ky tu vua nhap la: %o",ch);

printf("\nMa co so 16 cua ky tu vua nhap la: %x",ch);

Program 1.2
#include<iostream>

#define PI 3.14

int main(){

double f,C;

std::cout<<"Xin moi nhap gia tri tan so: ";

std::cin>>f;
 std::cout<<"\nXin moi nhap gia tri dien dung cua tu: ";

std::cin>>C;

std::cout<<"\nGia tri dien khang cua tu la: "<<1/(2*PI*f*C);

Program 1.3
#include<iostream>

int check(char ch1[], char ch2[2]){

for(int i = 0;ch1[i]; i++)

if(ch1[i] != ch2[i])

return 0;

return 1;

int main(){

double R1,R2,R3,Rtd;

char ch[10];

std::cout<<"Xin moi nhap vao gia tri dien tro R1 R2 R3:";

std::cin>>R1>>R2>>R3;
 std::cout<<"\nXin moi nhap vao cach mac dien tro 'noi tiep' hoac 'song song'";

fflush(stdin);

std::cin.getline(ch,10);

if(check(ch,"noi tiep"))

std::cout<<"\n Gia tri dien tro tuong duong la: "<<R1+R2+R3;

if(check(ch,"song song"))

std::cout<<"\n Gia tri dien tro tuong duong la: "<<(R1*R2*R3)/(R1*R2 + R1*R3 +
R2*R3);

Program 2.1
#include<iostream>

double nt(double a[], int n){

double s = 0;

for(int i = 0 ; i < n; i++)

s += a[i];

return s;

}
double ss(double a[], int n){

double s = 0;

for(int i = 0 ; i < n; i++)

s += 1/a[i];

return 1/s;

int check(char ch1[], char ch2[2]){

for(int i = 0;ch1[i]; i++)

if(ch1[i] != ch2[i])

return 0;

return 1;

int main(){

int n;

double *a = new double[n];

char ch[10];

do{

std::cout<<"Nhap vao so dien tro";

std::cin>>n;

}while(n<0 || n>20);

for(int i = 0; i < n;i++){

std::cout<<"\nNhap vao gia tri dien tro (>0) thu "<<i+1 <<": ";

std::cin>>a[i];
 if(a[i]<0){

printf("\nNhap sai moi nhap lai: ");

i--;

continue;

std::cout<<"\nNhap vao cach mac dien tro 'noi tiep' hoac 'song song': ";

fflush(stdin);

std::cin.getline(ch,10);

if(check(ch,"noi tiep"))

std::cout<<"\n Gia tri dien tro tuong duong la: "<<nt(a,n);

if(check(ch,"song song"))

std::cout<<"\n Gia tri dien tro tuong duong la: "<<ss(a,n);

Program 2.2
#include <iostream>
using namespace std;

int check(char ch){

if((ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z'))

return 1;

if(ch == ' ' )

return 2;

if(ch == '.' || ch == '?' || ch == '!' || ch == ',')

return 3;

return 0;

int main(){

char s[201];

int count = 0;

int kt = 1;

cin.getline(s,200);

for(int i = 0; s[i]; i++){

if(!check(s[i])){

printf("Du lieu khong hop le\n");

kt = 0;

break;

if((i == 0 && check(s[i]) == 1) || (check(s[i]) == 1 && check(s[i-1]) == 2))

count++;
 }

if(kt)

printf("\nCo %d tu",count);

Program 2.3
#include <iostream>

using namespace std;

int main(){

double A[9][9];

int M, N,i,j;

std::cout<<"Moi nhap so hang 0<M<10: ";cin>>M;

std::cout<<"Moi nhap so cot 0<N<10: ";cin>>N;

for (i=0;i<M;i++)

for (j=0;j<N;j++)

cout<<"Nhap phan tu cua hang"<< i+1<<" cot "<<j+1 << ": "; cin>>A[i][j];

}
int tonghang;

tonghang=0;

for (i=0;i<M;i++)

cout<<"Tong hang"<<i+1<<" la: ";

for(j=0;j<N;j++)

tonghang+=A[i][j];

cout<<tonghang<<endl;

tonghang=0;

for (j=0;j<M;j++)

cout<<"Tong cot"<<j+1<<" la: ";

for (i=0;i<M;i++)

tonghang+=A[i][j];

cout<<tonghang<<endl;

tonghang=0;

}
 int tong=0;

for(i=0;i<M;i++)

for(j=0;j<N;j++)

tong+=A[i][j];

cout<<"Tong la: "<< tong;

Bài tập 1
#include <iostream>

using namespace std;

int Factorial(int N){

if(N == 1)

return 1;

return N*Factorial(N-1);

int main(){
 int N;

cout << "Nhap vao N >= 0: ";

cin >> N;

cout <<"N! = "<<Factorial(N);

Bài tập 2
#include <iostream>

using namespace std;

double Pow(double x, int n){

if(n == 0)

return 1;

return

(n > 0) ? x*Pow(x,n-1) : 1/Pow(x,-n);

int main(){

double x;
 int n;

cout << "Nhap vao gia tri x = "; cin >> x;

cout << "\nNhap vao so mu n = "; cin >> n;

cout << "\n" <<x << "^" << n << " = " << Pow(x,n);

Bài tập 3
#include <iostream>

using namespace std;

int USCLN(int a, int b){

if(a == b)

return a;

if(a < b)

return USCLN(a,b-a);

else

return USCLN(a-b,b);

int main(){
 int a = 12, b = 6;

std::cout<<"USCLN cua "<< a << " va " << b << " la: " << USCLN(a,b);

Bài tập 4
#include <iostream>

#include <math.h>

using namespace std;

double Value(double a[], int n, double x0){

x0 = 1;

double s = 0;

for(int i = 0; i <= n; i++){

x0 *= x0;

s += a[i]*x0;

return s;

}
int main(){

double a[10];

int n;

double x0;

cout << "Nhap vao bac cua da thuc: "; cin >> n;

cout << "\nNhap vao mang cac he so: ";

for(int i = 0; i <= n; i++){

cout <<"\nNhap vao he so a" << i <<": "; cin >> a[i];

cout <<"\nNhap vao gia tri x0: "; cin >> x0;

cout <<"\nGia tri da thuc tai x0 la: " << Value(a,n,x0);

Lớp Complex
// Complex.cpp : Defines the entry point for the console application.

//

#include <iostream>
using namespace std;

class Complex

private:

double re,im;

public:

Complex(double r = 0, double i = 0)

: re(r), im(i)

Complex(Complex &C) // Copy constructor

:re(C.re), im(C.im)

Complex &operator + (const Complex c);

Complex &operator - (Complex c);

Complex &operator * (Complex c);

Complex &operator / (Complex c);

friend ostream & operator << (ostream & os, Complex &C){

return os << '(' << C.re << " + " << C.im <<"i) ";

};

Complex& Complex::operator+(const Complex c){

return z;

Complex& Complex::operator-(Complex c){

Complex z(this->re - c.re,this->im - c.im);

return z;

Complex& Complex::operator*(Complex c){

Complex z(this->re * c.re - this->im * c.im, this->re * c.im + this->im * c.re);

return z;

Complex& Complex::operator/(Complex c){

Complex a(c.re,-c.im);

double b;

b = c.re * c.re + c.im * c.im;

a = *this * a;

Complex z(a.re/b,a.im/b);

return z;

int main()

Complex y(1,2);
 Complex z(2,3);

double a = 8;

std::cout << y << " + " << z << " = " << y + z << endl;

std::cout << y << " - " << z << " = " << y - z << endl;

std::cout << y << " * " << z << " = " << y * z << endl;

std::cout << y << " / " << z << " = " << y / z << endl;

return 0;

Lớp String
#include <iostream>

#include <string.h>

using namespace std;

class String{

private:

int lenght;

char* data;
private:

String(char* data, int lenght )

: lenght(lenght), data(data)

{}

public:

String()

: lenght(0), data(new char[1])

data[0] = 0;

String(const char*s){

lenght = strlen(s);

data = new char[lenght+1];

strcpy(data,s);

String(String &s){

lenght = s.lenght;

data = new char[lenght+1];

for(int i = 0; i < lenght; i++)

data[i] = s[i];

data[lenght] = 0;

~String(){
 delete []data;

/* int getLenght(){

return this->lenght;

*/

char* getData(){

return data;

public:

// So sanh 2 string

// tra ve -1 , 0 , 1 tuong ung voi String < , = , > string s

int Compare(String s){

for(int i = 0; i < this->lenght; i++)

if(data[i] != s[i])

return data[i] > s[i] ? 1:-1;

return 0;

public:

char& operator[] (int index){

return data[index];

String & operator = (String &s){ // Toan tu gan

data = new char[lenght+1];

for(int i = 0; i < lenght; i++)

data[i] = s[i];

data[lenght] = 0;

*/

delete []data;

lenght = s.lenght;

data = new char[lenght+1];

strcpy(data, s.data);

return(*this);

public:

String operator + (char c){

/*char * data1 = new char[lenght+2];

for(int i = 0; i < lenght; i++)

data1[i] = data[i];

data1[lenght] = c;

data1[lenght+1] = 0;

String s1(data1,lenght+1);

return s1;

*/

int lenght = this->lenght+1;

strcpy(data,this->data);

data[this->lenght] = c;

data[lenght] = 0;

String s1(data,lenght);

return s1;

String operator + ( String s){

/*char* data1 = new char[lenght+s.lenght+1];

for(int i = 0; i < lenght; i++)

data1[i] = data[i];

for(int i = 0; i < s.lenght; i++)

data1[i+lenght] = s[i];

data[lenght+s.lenght] = 0;

String s1(data1,lenght+s.lenght);

return s1;

*/

int lenght = this->lenght + s.lenght;

char * data = new char [lenght+1];

strcpy(data,this->data);

strcpy(data+this->lenght,s.data);

String s1(data,lenght);

return s1;
 }

public:

friend ostream& operator << (ostream& os,const String &s){

return os << s.data;

};

int main(){

char c = '1';

String s1("HaiTran");

cout <<"s1 = "<<s1;

String s2("1994");

cout <<"\ns2 = "<<s2;

cout <<"\nc = "<<c;

cout <<"\ns1 + c = "<<s1+c;

cout <<"\ns1 + s2 = "<<s1+s2;