Пример 24. Бинарные операторы

#include <iostream> // cout

using namespace std;

void main()

{

int X, Y;

// X = X + 2

X = 4; X += 2;

cout<<"X + 2 = "<<X<<endl;

cout<<"X = "; cin>>X;

X += 2;

cout<<"X + 2 = "<<X<<endl;

// X = X + 1 Y = X

X = 4; Y = X ++;

cout<<"Y = X++ ; X = "<<X<< " Y = "<<Y<<endl;

cout<<"X = "; cin>>X;

Y = X++;

cout<<"Y = X++ ; X = "<<X<< " Y = "<<Y<<endl;

// Y = X X = X+1

X = 4; Y = ++X ;

cout<<"Y = ++X ; X = "<<X<<" Y = "<<Y<<endl;

cout<<"X = "; cin>>X;

Y=++X ;

cout<<"Y = ++X ; X = "<<X<<" Y = "<<Y<<endl;

// X = X - 2

X = 4; X -= 2;

cout<<" 4 – 2 = "<<X<<endl;

cout<<"X = "; cin>>X;

X -= 2;

cout<<"X – 2 = "<<X<<endl;

// X = X * 2

X = 4; X *= 2;

cout<<"4 * 2 = "<<X<<endl;

cout<<"X = "; cin>>X;

X *= 2;

cout<<"X * 2 = "<<X<<endl;

// X = X / 2 (частное)

X = 4; X /= 2;

cout<<"4 / 2 = "<<X<<endl;

cout<<"X = "; cin>>X;

X /= 2;

cout<<"X / 2 = "<<X<<endl;

// X = X mod 2 (остаток)

X = 4; X %= 2;

cout<<"4 % 2 = "<<X<<endl;

cout<<"X = "; cin>>X;

X %= 2;

cout<<"X % 2 = "<<X<<endl;

}

ПРИМЕР 25. Инкрементация и декрементация

#include <iostream> // cout

using namespace std;

void main()

{

int i = 2, j = 0;

i++;

cout << i << endl; // 3

--i;

cout << i << endl; // 2

j = 5 + i--;

cout << i <<" "<< j << endl; // 1 7

i = 2;

j = 5 + --i;

cout << i <<" "<< j << endl; // 1 6

int x = 2;

x = ++x * 4;

cout << x << endl; // 12

x = 2;

x = x++ * 4;

cout << x << endl; // 9

}

Пример 26***. Ограниченность диапазона представимых целых чисел

#include <iostream> // cout

using namespace std; // #include <limits.h>

void main()

{ unsigned char UCX, UCY;

UCX = 127; // CHAR_MAX

UCY = UCX + 1;

cout<<"1 "<<UCY<<" "<<int(UCY)<<endl; // A 128

UCX = 255; // UCHAR_MAX

UCY = UCX + 1;

cout<<"2 "<<UCY<<" "<<int(UCY)<<endl; // 0

char CX, CY;

CX = 127; // CHAR_MAX

CY = CX + 1;

cout<<"3 "<<CY<<" "<<int(CY)<<endl; //A -128 CHAR_MIN

unsigned short USX, USY;

USX = 32767; // SHRT_MAX

USY = USX + 1;

cout<<"4 "<<USY<<endl; // 32768

USX = 65535; // USHRT_MAX

USY = USX + 1;

cout<<"5 "<<USY<<endl; // 0

short SX = 32767; // SHRT_MAX

short SY = SX + 1;

cout<<"6 "<<SY<<endl; // -32768 SHRT_MIN

unsigned int UIX, UIY;

UIX = 2147483647; // INT_MAX

UIY = UIX + 1;

cout<<"7 "<<UIY<<endl; // 2147483648

UIX = 4294967295; // UINT_MAX

UIY = UIX + 1;

cout<<"8 "<<UIY<<endl; // 0

int IX, IY;

IX = 2147483647;

IY = IX + 1;

cout<<"9 "<<IY<<endl; // -2147483648 INT_MIN

}