시리즈:초급 프로그래밍 c++
c++ 초반
#include <iostream>
using namespace std;
class Cube
{
public:
int x, y, z;
int Volume, Area;
Cube();
Cube( int x, int y, int z );
};
Cube::Cube( int x, int y, int z) {
this->x = x, this->y = y, this->z = z;
Volume = x * y * z;
Area = x * y * 2 + y * z * 2 + z * x * 2;
}
Cube::Cube() :Cube ( 1, 1, 1) {} //위임 생성자
int main(void)
{
Cube *boxes = new Cube[3];
boxes[0] = Cube();
boxes[1] = Cube( 3, 3, 3 );
boxes[2] = Cube( 4, 4, 4 );
cout << "부피" << boxes->Volume << endl;
cout << "겉면적" << boxes->Area << endl;
boxes++;
cout << "부피" << boxes->Volume << endl;
cout << "겉면적" << boxes->Area << endl;
boxes++;
cout << "부피" << boxes->Volume << endl;
cout << "겉면적" << boxes->Area << endl;
}
확률과 통계와 c++
#include <iostream>
using namespace std;
class Data
{
private:
float *data;
int size = 0;
public:
float sum = 0;
float mean = 0;
float variance = 0;
Data(int size, float *data)
{
this->size = size;
this->data = data;
};
void getsum()
{
int i = 0;
while ( i < size )
{
sum = sum + *data;
data++, i++;
}
data = data - size;
}
void getmean()
{
mean = sum / size;
}
void getvariance()
{
float sum = 0;
for (int i = 0 ; i < size ; i++)
{
float meanMINUSdata = mean - *data;
data++;
sum = sum + meanMINUSdata * meanMINUSdata;
}
data = data - size;
variance = sum / (double) size;
}
};
int main(void)
{
cout << "자료의 크기 ? >>";
int size;
cin >> size;
float *array = new float [size];
for (int i = 0 ; i < size ; i++)
cin >> array[i];
Data data1(size, array);
data1.getsum();
cout << "합계 : " << data1.sum << endl;
data1.getmean();
cout << "평균 : " << data1.mean << endl;
data1.getvariance();
cout << "분산 : " << data1.variance << endl;
return 0;
}
void (*cha)() = printf; printf("%p", cha); cha("asdf");