Bab 7

Kasus

                7.1

#include <iostream>

/* run this program using the console pauser or add your own getch, system("pause") or input loop */

using namespace std;

class HitungRATA {

friend ostream& operator<<(ostream&, HitungRATA&);

friend istream& operator>>(istream&, HitungRATA&);

public:

float rata();

private:

int n;

int A[20];

};

istream& operator>>(istream& in, HitungRATA& a) {

cout << "Banyaknya data : ";

in >> a.n;

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

cout << "Masukkan data ke- : " << i+1 << " > ";

cin >> a.A[i];

}

return in;

}

float HitungRATA::rata() {

float total=0;

for (int i = 0; i<n; i++) total = total + A[i];

return(total/n);

}

ostream& operator<<(ostream& out, HitungRATA& a) {

cout << "Rata-rata dari " << a.n;

cout << " bilangan adalah : "<< a.rata();

return out;

}

main() {

HitungRATA run;

cin >> run;

cout << run;

return 0;

 }

                7.2

#include <iostream>

#include <math.h>

#include <conio.h>

using namespace std;

class HitungStatistik {

friend ostream& operator<<(ostream&, HitungStatistik&);

friend istream& operator>>(istream&, HitungStatistik&);

public:

float rata();

float STD();

private:

long sqrt(int n) { return(n*n); }

int n;

int A[20];

};

istream& operator>>(istream& in, HitungStatistik& a)

{

cout << "Banyaknya data : ";

cin >> a.n;

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

{

cout << "Masukkan data ke- : " << i+1 << " > ";

cin >> a.A[i];

}

return in;

}

float HitungStatistik::rata()

{

float total=0;

for (int i = 0; i<n; i++) total = total + A[i];

return(total/n);

}

float HitungStatistik::STD ()

{ float rerata = rata();

float jumlah=0.0;

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

jumlah = jumlah + sqrt(A[i] - rerata);

return(sqrt (jumlah/(n-1)));

}

ostream& operator<<(ostream& out, HitungStatistik& a) {

cout << "Rata-rata dari " << a.n;

cout<< " bilangan adalah : " << a.rata() << endl;

cout << "Standar deviasi= " << a.STD();

return out;

}

Main() {

HitungStatistik run;

cin >> run;

cout << run;

return 0;

}

                      7.3

#include <iostream>

#include <math.h>

using namespace std;

class HitungStatistik {

friend ostream& operator<<(ostream&, HitungStatistik&);

friend istream& operator>>(istream&, HitungStatistik&);

public:

int maksimum();

private:

int maksimum2(int, int);

int n;

int A[20];

};

istream& operator>>(istream& in, HitungStatistik& a)

{

cout << "Banyaknya data : ";

cin >> a.n;

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

{

cout << "Data ke- : " << i+1 << " > ";

cin >> a.A[i];

}

return in;

}

int HitungStatistik::maksimum2(int a, int b)

{ if (a>b) return(a);

else return(b);

}

int HitungStatistik::maksimum()

{ int temp = A[0];

for (int i = 1; i<n; i++)

temp = maksimum2(temp, A[i]);

return(temp);

}

ostream& operator<<(ostream& out, HitungStatistik& a) {

cout << "Nilai terbesar: " << a.maksimum();

return out;

}

main() {

HitungStatistik run;

cin >> run;

cout << run;

return 0;

}

                      7.4

#include <iostream>

#include <math.h>

using namespace std;

class HitungStatistik {

friend ostream& operator<<(ostream&, HitungStatistik&);

friend istream& operator>>(istream&, HitungStatistik&);

public:

void maks_min();

private:

int m1, m2;

int n;

int A[20];

};

istream& operator>>(istream& in, HitungStatistik& a)

{

cout << "Banyaknya data : ";

cin >> a.n;

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

{

cout << "Data ke- : " << i+1 << " > ";

cin >> a.A[i];

}

return in;

}

void HitungStatistik::maks_min()

{ m1 = m2 = A[0];

for (int i=1; i<n; i++)

{

if (A[i] > m1) m1 = A[i];

if (A[i] < m2) m2 = A[i];

}

}

ostream& operator<<(ostream& out, HitungStatistik& a) {

a.maks_min();

cout << "Nilai terbesar : " << a.m1 << endl;

cout << "Nilai terkecil : " << a.m2;

return out;

}

main() {

HitungStatistik run;

cin >> run;

cout << run;

return 0;

}

                7.5

#include <iostream>

#include <math.h>

using namespace std;

class HitungStatistik {

friend ostream& operator<<(ostream&, HitungStatistik&);

friend istream& operator>>(istream&, HitungStatistik&);

public:

HitungStatistik();

void hitung_modus();

private:

void maksimum();

void frekuensi();

int maks, item;

int n;

int A[20];

int f[11];

};

HitungStatistik::HitungStatistik()

{ for (int i=0; i<20; i++) f[i] = 0; }

istream& operator>>(istream& in, HitungStatistik& a) {

cout << "Banyaknya data : ";

cin >> a.n;

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

cout << "Data ke- : " << i+1 << " > ";

cin >> a.A[i];

}

return in;

}

void HitungStatistik::maksimum()

{

maks = f[0];

item = 1;

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

if (f[i] > maks) {

maks = f[i];

item = i;

}

cout << "Modus = " << item;

}

void HitungStatistik::frekuensi()

{

for (int i=1; i<n; i++) ++f[A[i]];

}

void HitungStatistik::hitung_modus() {

cout << "Frekuensi running\n";

frekuensi();

maksimum();

}

ostream& operator<<(ostream& out, HitungStatistik& a) {

cout << "Mulai ...\n";

a.hitung_modus();

cout << "Nilai modus : " << a.item;

return out;

}

main() {

HitungStatistik run;

cin >> run;

cout << run;

return 0;

}

                7.6

#include <iostream>

#include <string.h>

#include <conio.h>

using namespace std;

class Palindrom {

friend ostream& operator<<(ostream&, Palindrom&);

friend istream& operator>>(istream&, Palindrom&);

public:

int cek_palindrom();

private:

char *s;

};

ostream& operator<<(ostream& out, Palindrom& a) {

if (a.cek_palindrom())

cout << a.s << " adalah palindrom";

else out << a.s << " bukan palindrom";

return out;

};

istream& operator>>(istream& in, Palindrom& a) {

cout << "Masukkan sebuah kalimat : ";

cin >> a.s;

return in;

};

int Palindrom::cek_palindrom()

{ int i, pj;

pj = strlen(s);

for (i=0; i<=pj/2 ;i++)

if (s[i] != s[pj-i-1]) return 0;

return 1;

}

main() {

Palindrom kata;

cin >> kata;

cout << kata;

getch();

return 0;

}

                7.7

#include <iostream>

#include <conio.h>

#include <cstdlib>

#include <string.h>

using namespace std;

class Sandi {

friend ostream& operator<<(ostream&, Sandi&);

public:

Sandi() { kalimat = "Algoritma dan Pemrograman";}

void enkripsi(char *);

void dekripsi(int *);

private:

char *kalimat;

int *kalimatTersandi; };

void Sandi::enkripsi(char *kalimat) {

for (int i=0; kalimat[i] != '\0'; i++)

if (kalimat[i] != ' ')

if ( kalimat[i]%2==0 ) kalimatTersandi[i] = kalimat[i] + 3;

else kalimatTersandi[i] = kalimat[i] + 5;

else kalimatTersandi[i] = 0;

}

void Sandi::dekripsi(int *kalimatTersandi) {

for (int i=0; kalimat[i] != '\0'; i++)

if (kalimatTersandi[i] != 0)

if ( kalimat[i]%2==1 ) kalimat[i] = kalimatTersandi[i] - 5;

else kalimat[i] = kalimatTersandi[i] - 3;

else kalimat[i] = ' ';

}

ostream& operator<<(ostream& out, Sandi& snd) {

cout << "Kata Asli : " << snd.kalimat;

snd.enkripsi(snd.kalimat);

cout << "\nSetelah disandikan : ";

for (int i=0; i<=strlen(snd.kalimat); i++)

out << snd.kalimatTersandi[i] << " ";

snd.dekripsi(snd.kalimatTersandi);

cout << "\nSetelah dikembalikan : " << snd.kalimat;

return out;

}

int main() {

Sandi X;

cout << X;

}

Latihan

1.       

2.       

#include <iostream>

/* run this program using the console pauser or add your own getch, system("pause") or input loop */

using namespace std;

int main(int argc, char** argv) {

                string a;

                cout<<"Masukkan Kalimat : ";getline(cin,a);

                cout<<a<<endl;

                cout<<"Panjang Karakter : "<<a.size();

                return 0;

}

3.       

#include <iostream>

#include <string.h>

/* run this program using the console pauser or add your own getch, system("pause") or input loop */

using namespace std;

int main(int argc, char** argv)

{

                string a;

                cout<<"masukkan kalimat : ";

                getline(cin,a);

                int b = a.length();

                cout<<"dalam bentuk kapital : ";

                for(int c=0;c<=b;c++)

                {

                a[c]=toupper(a[c]);

                cout<<a[c];

                }

                cout<<endl;

                cout<<"dalam bentuk huruf kecil : ";

                for(int d=0;d<=b;d++)

                {

                a[d]=tolower(a[d]);

                cout<<a[d];

                }

                cout<<endl;

                return 0;

}