int main(int argc, char** argv) {
IntCell arr[3];
// read three numbers
int input;
for (int i = 0; i < 3; i++) {
cin >> input;
arr[i] = IntCell(input);
}
// print the numbers forwards and backwards
cout << arr[0].read() << " " << arr[1].read() << " " << arr[2].read() << endl;
cout << arr[2].read() << " " << arr[1].read() << " " << arr[0].read() << endl;
// find min, max and total
IntCell total = IntCell(0);
IntCell min = arr[0], max = arr[0];
for (int i = 0; i < 3; i++) {
if (arr[i].read() > max.read()) max = arr[i];
if (arr[i].read() < min.read()) min = arr[i];
total = total.add(arr[i]);
}
cout << "max: " << max.read() << endl;
cout << "min: " << min.read() << endl;
cout << "avg: " << (float)total.read() / 3.0 << endl;
return 0;
}
/*
* Figure 1.15.
*/
int f( )
{
IntCell a( 2 );
IntCell b = a;
IntCell c;
c = b;
a.write( 4 );
cout << a.read( ) << endl << b.read( ) << endl << c.read( ) << endl;
return 0;
}
int main()
{
IntCell m;
IntCell n;
m.write(5);
n.write(2);
IntCell o = m + n;
IntCell p = m - n;
cout << "Cell contents m: " << m << endl;
cout << "Cell contents n: " << n.read() << endl;
cout << "Cell contents o: " << o.read() << endl;
cout << "Cell contents p: " << p.read() << endl;
return 0;
}
int main( )
{
IntCell m; // Or, IntCell m( 0 ); but not IntCell m( );
m.write( 5 );
std::cout << "Cell contents: " << m.read( ) << std::endl;
return 0;
}
int main( )
{
IntCell m;
m.write( 5 );
std::cout << "Cell contents: " << m.read( ) << std::endl;
return 0;
}
int main()
{
IntCell obj;
/* 使用explicit意味着单参数构造函数不能用来创建隐式临时对象
* 编译以下两句会得到如下错误
* note: candidate function (the implicit copy assignment operator)
* not viable: no known conversion from 'int' to 'const IntCell' for 1st argument
*/
// obj = 37;
obj.write(666);
std::cout << obj.read() << "\n";
return 0;
}
}
const IntCell& IntCell::operator= (const IntCell& rhs) {
if (this != &rhs) {
*m_storedValue = *rhs.m_storedValue;
}
return *this;
}
int IntCell::read() const {
return *m_storedValue;
}
void IntCell::write(int value) {
*m_storedValue = value;
}
TEST_CASE("Class created", "[class]") {
IntCell m1(1);
REQUIRE(m1.read() == 1);
m1.write(2);
REQUIRE(m1.read() == 2);
IntCell* pm2 = NULL;
REQUIRE(pm2 == NULL);
pm2 = new IntCell(2);
REQUIRE(pm2->read() == 2);
delete pm2;
}