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C++ Primer Plus第7章题目题解
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#include
using namespace std;
double fun(double x, double y);
int main()
{
cout << "请输入两个数: ";
double a, b;
while (cin >> a >> b && a && b)
{
cout << fun(a, b) << endl;
cout << "请输入两个数: ";
}
cout << "BYE!" << endl;
return 0;
}
double fun(double x, double y)
{
return 2.0 * x * y / (x + y);
}
7-2
#include
using namespace std;
int input(double *a);
void output(double *a, int n);
double fun(double *a, int n);
int main()
{
double a[10];
int num = input(a);
output(a, num);
return 0;
}
int input(double *a)
{
int i;
for (i = 0; i < 10; ++i)
{
cin >> a[i];
if (a[i] <= 0)
break;
}
return i;
}
void output(double *a, int n)
{
for (int i = 0; i < n; ++i)
cout << a[i] << " ";
cout << fun(a, n) << endl;
}
double fun(double *a, int n)
{
double sum = 0;
for (int i = 0; i < n; ++i)
sum += a[i];
sum /= n;
return sum;
}
7-3
#include
using namespace std;
struct box
{
char maker[40];
float height;
float width;
float length;
float volume;
};
void fun_a(box a);
void fun_b(box *a);
int main()
{
box a =
{
"Yuuji",
10,
20,
1,
22
};
fun_a(a);
fun_b(&a);
return 0;
}
void fun_a(box a)
{
cout << a.maker << endl << a.height << endl << a.width << endl << a.length << endl << a.volume << endl;
}
void fun_b(box *a)
{
a->volume = a->height * a->width * a->length;
cout << a->volume << endl;
}
7-4
#include
using namespace std;
int main()
{
double ans = 1;
for (int i = 0; i < 5; i++)
ans *= (double)(5 - i) / (double)(47 - i);
ans *= double(1) / 27;
cout << ans << endl;
return 0;
}
7-5
#include
using namespace std;
long long fun(int n);
int main()
{
int n;
while(cin >> n && n >= 0){
long long ans = 0;
if(!n)
cout << "1" << endl;
else{
ans = fun(n);
cout << ans << endl;
}
}
return 0;
}
long long fun(int n)
{
long long ans = 1;
for( ; n ; --n)
ans *= n;
return ans;
}
7-6
#include
using namespace std;
int File_array(double *a , int len);
void Show_array(double *a , int len);
void Reverse_array(double *a , int len);
int main()
{
double a[10];
int num = File_array(a , 10);
Show_array(a , num);
Reverse_array(a , num);
Show_array(a , num);
Reverse_array(a + 1 , num - 2);
Show_array(a , num);
return 0;
}
int File_array(double *a , int len)
{
int i;
for(i = 0 ; i < len ; ++ i)
cin >> a[i];
return i;
}
void Show_array(double *a , int len)
{
for(int i = 0 ; i < len ; ++ i)
cout << a[i] << " ";
cout << endl;
}
void Reverse_array(double *a , int len)
{
double temp;
for(int i = 0 ; i < len / 2 ; ++ i)
{
temp = a[i];
a[i] = a[len-1-i];
a[len-1-i] = temp;
}
}
7-7
#include
using namespace std;
double *fill_array(double *a);
void show_array(double *a, double *b);
void revalue(double r, double *a, double *b);
int main()
{
double a[5];
double *e = fill_array(a);
show_array(a, e);
revalue(0.5, a, e);
show_array(a, e);
return 0;
}
double *fill_array(double *a)
{
int i = 0;
while (cin >> a[i++])
if (i == 5)
break;
return &a[i];
}
void show_array(double *a, double *b)
{
while (a != b)
{
cout << *a << " ";
++a;
}
cout << endl;
}
void revalue(double r, double *a, double *b)
{
while (a != b)
{
(*a) *= r;
++a;
}
}
7-8
a
#include
using namespace std;
void fill_array(double *a, int len);
void show_array(double *a, int len, const char **p); //char *p是字符串，字符串数组就是char **p
int main()
{
const char *p[4] = { "Spring", "Summer", "Fall", "Winter" };
double a[4];
fill_array(a, 4);
show_array(a, 4, p);
return 0;
}
void fill_array(double *a, int len)
{
for (int i = 0; i < len; ++i)
cin >> a[i];
}
void show_array(double *a, int len, const char **p)
{
for (int i = 0; i < len; ++i)
cout << *(p + i) << "\t";
cout << endl;
for (int i = 0; i < len; ++i)
cout << a[i] << "\t";
cout << endl;
}
b
#include
using namespace std;
struct money{
double a[4];
};
void fill_array(money *m , int len);
void show_array(money *m , int len , char **p);
int main()
{
money t;
char *p[4] = {"Spring" , "Summer" , "Fall" , "Winter"};
fill_array(&t , 4);
show_array(&t , 4 , p);
return 0;
}
void fill_array(money *m , int len)
{
for(int i = 0 ; i < len ; ++ i)
cin >> m->a[i];
}
void show_array(money *m , int len , char **p)
{
for(int i = 0 ; i < len ; ++ i)
cout << *(p + i) << "\t";
cout << endl;
for(int i = 0 ; i < len ; ++ i)
cout << m->a[i] << "\t";
cout << endl;
}
7-9
太麻烦了，有空再写
7-10
#include
double calculate(double a, double b, double (*pf)(double a, double b));
double add(double a, double b);
double max(double a, double b);
double min(double a, double b);
int main()
{
double a, b;
double (*pf[3])(double a, double b);
pf[0] = add;
pf[1] = max;
pf[2] = min;
while(std::cin >> a >> b)
for(int i = 0 ; i < 3 ; ++i)
std::cout << (*pf[i])(a, b) << std::endl;
return 0;
}
double calculate(double a, double b, double (*pf)(double a, double b))
{
return (*pf)(a, b);
}
double add(double a, double b)
{
return a + b;
}
double max(double a, double b)
{
return a > b ? a : b;
}
double min(double a, double b)
{
return a < b? a : b;
}
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