(C++기초플러스 6판 프로그래밍 연습 정답,솔루션) CHAPTER 07 함수-C++의 프로그래밍 모듈 p.462~ 7번~10번

7번

#include<iostream>
const int Max = 5;
double * fill_array(double * a, double * b);
void show_array(double* a, double* b);
void revalue(double r, double* a, double* b);

int main()
{
	using namespace std;
	double properties[Max];

	double * b = fill_array(properties, properties + Max);
	show_array(properties, b);
	if (properties != b)
	{
		cout << "재평가율을 입력하십시오: ";
		double factor;
		while (!(cin >> factor))
		{
			cin.clear();
			while (cin.get() != '\n')
				continue;
			cout << "잘못 입력, 수치 입력 : ";
		}
		revalue(factor, properties, b);
		show_array(properties, b);
	}
	cout << "프로그램을 종료합니다.\n";
	return 0;
}

double * fill_array(double* a, double* b)
{
	using namespace std;
	double temp;
	int i;
	for (i = 0; i < Max; i++)
	{
		cout << (i + 1) << "번 부동산의 가격: $";
		cin >> temp;
		if (!cin)
		{
			cin.clear();
			while (cin.get() != '\n')
				continue;
			cout << "입력 불량; 입력 과정 끝\n";
			break;
		}
		else if (temp < 0)
			break;
		*(a+i) = temp;
	}
	return (a + i);
}

void show_array(double* a, double* b)
{
	using namespace std;
	for (int i = 0; (a + i) != b; i++)
	{
		cout << (i + 1) << "번 부동산: $";
		cout << *(a + i) << endl;
	}
}

void revalue(double r, double* a, double* b)
{
	for (int i = 0; (a + i) != b; i++)
		*(a + i) *= r;
}

 

8-a

#include<iostream>
#include<array>
#include<string>

const int Seasons = 4;
const char * Sname[4] =
		{ "Spring","Summer","Fall","Winter" };

void fill(std::array<double, Seasons> * pa);
void show(std::array<double, Seasons> da);

int main()
{
	std::array<double, Seasons> expenses;
	fill(&expenses);
	show(expenses);
	return 0;
}

void fill(std::array<double, Seasons>* pa)
{
	using namespace std;
	for (int i = 0; i < Seasons; i++)
	{
		cout << Sname[i] << "에 소요되는 비용:";
		cin >> (*pa)[i];
	}
}
void show(std::array<double, Seasons> da)
{
	using namespace std;
	double total = 0.0;
	cout << "\n계절별 비용S/n";
	for (int i = 0; i < Seasons; i++)
	{
		cout << Sname[i] << " : $" << da[i] << endl;
		total += da[i];
	}
	cout << "총 비용 : $" << total << endl;
}

 

8-b

#include<iostream>
#include<array>
#include<string>

const int Seasons = 4;
const char * Sname[4] =
		{ "Spring","Summer","Fall","Winter" };

void fill(struct a * pa);
void show(struct a da);

struct a  {
	double ex[Seasons];
};

int main()
{
	struct a expenses;
	fill(&expenses);
	show(expenses);
	return 0;
}

void fill(struct a* pa)
{
	using namespace std;
	for (int i = 0; i < Seasons; i++)
	{
		cout << Sname[i] << "에 소요되는 비용:";
		cin >> pa->ex[i];
	}
}
void show(struct a da)
{
	using namespace std;
	double total = 0.0;
	cout << "\n계절별 비용S\n";
	for (int i = 0; i < Seasons; i++)
	{
		cout << Sname[i] << " : $" << da.ex[i] << endl;
		total += da.ex[i];
	}
	cout << "총 비용 : $" << total << endl;
}

 

9번

#include<iostream>
using namespace std;

const int SLEN = 30;
struct student
{
	char fullname[SLEN];
	char hobby[SLEN];
	int ooplevel;
};

int getinfo(student pa[], int n);
void display1(student st);
void display2(const student* pa);
void display3(const student pa[], int n);

int main()
{
	cout << "학급의 학생 수를 입력하십시오: ";
	int class_size;
	cin >> class_size;
	while (cin.get() != '\n')
		continue;

	student* ptr_stu = new student[class_size];
	int entered = getinfo(ptr_stu, class_size);
	for (int i = 0; i < entered; i++)
	{
		display1(ptr_stu[i]);
		display2(&ptr_stu[i]);
	}
	display3(ptr_stu, entered);
	cout << "프로그램을 종료합니다.\n";
	return 0;
}

int getinfo(student pa[], int n)
{
	int i;
	for (i = 0; i < n; i++)
	{
		cout << "학생 이름 : "; cin.getline(pa[i].fullname, SLEN);
		if (pa[i].fullname[0] == '\0')
			break;
		cout << "취미 : "; cin.getline(pa[i].hobby, SLEN);
		cout << "ooplevel : "; (cin >> pa[i].ooplevel).get();
	}
	return i;
}

void display1(student st)
{
	cout << st.fullname << " "
		 << st.hobby << " "
		 << st.ooplevel << endl;
}
void display2(const student* pa)
{
	cout << pa->fullname << " "
		 << pa->hobby << " "
		 << pa->ooplevel << endl;
}
void display3(const student pa[], int n)
{
	for (int i = 0; i < n; i++)
	{
		cout << pa[i].fullname << " "
			<< pa[i].hobby << " "
			<< pa[i].ooplevel << endl;
	}
}

 

10번

#include<iostream>

double calculate(double x, double y, double (*cal)(double, double));
double add(double x, double y);
double min(double x, double y);

using namespace std;
int main()
{
	double (*pf[2])(double, double) = { add,min };
	for (;;)
	{
		double x, y;
		int n;
		cout << "두 수 입력 (종료하려면 아무 문자나 입력) : "; 
		if (!(cin >> x >> y))
			break;
		cout << "덧셈 : 0		뺄셈 : 1\n"; cin >> n;
		double q = calculate(x, y, *pf[n]); cout << "결과값 " << q << endl;
	}

}


double calculate(double x, double y, double (*cal)(double, double))
{
	return (*cal)(x, y);
}
double add(double x, double y)
{
	return x + y;
}
double min(double x, double y)
{
	return x - y;
}