C/C++教程
C++ Primer Plus 第六版 第七章答案 函数——C++的编程模块
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老样子
复习题+编程练习
//7.12
//1
定义函数，提供原型，调用函数
//2
void igor();
float tofu(int);
double mpg(double, double);
long sumation(long[], int n);
double doctor(const char[]);
void ofcourse(boss);
char* plot(map*);
//3
void becint(int arr[], int n, int value)
{
for (int i = 0; i < n; i++)
arr[i] = value;
}
//4
void becint(int* begin, int* end, int value)
{
int* pt;
for (pt = begin; pt != end; pt++)
*pt = value;
}
//5
double returnmax(const double arr[], int size)
{
if (size < 1)
{
std::cout << "Invalid size of array:" << size << endl;
std::cout << "Returning a value of 0\n";
return 0;
}
else
{
double max;
max = arr[0];
for (int i = 0; i < size; i++)
if(arr[i] > max)
max = arr[i];
return max;
}
}
//6
将const限定符用于指针，可以防止原始数据被修改。但是当程序传递基本类型时，将按值传递
以便函数使用副本。这样原始数据将得到保护
//7
字符串可以存储在char数组中
可以用带双引号的字符串表示
可以用指向字符串第一个字符的指针表示
//8
int replace(char* str, char c1, char c2)
{
int num = 0;
while (str != '\0')
{
if (str == c1)
{
str = c2;
num++;
}
str++;
}
return num;
}
//9
字符串解释为第一个元素的地址，因此第一个表示p的地址，第二个表示c的地址
换句话说，字符串常量和数组名的行为相同
//10
按值传递直接传递结构名glitz，按地址传递要使用地址运算符&glitz
按值传递自动保护原始数据，但是要以时间和内存为代价
按地址传递可以节省时间和内存，但不能保护原始数据除非使用const限定符
按值传递可以使用常规的结构成员表示法，按地址必须使用间接成员运算符
//11
int judge(int (*pf)(const char*));
//12
void fa(applicant a)
{
std::cout << a.name << endl;
for (int i = 0; i < 3; i++)
std::cout << a.credit_ratings[i] << endl;
}
void fb(const applicant* pa)
{
std::cout << pa->name << endl;
for (int i = 0; i < 3; i++)
std::cout << pa->credit_ratings[i] << endl;
}
//13
typedef void (*p_f1)(applicant* a);
p_f1 p1 = f1;
typedef const char* (*p_f2)(const applicant* a1, const applicant* a2);
p_f2 p2 = f2;
p_f1 ap[5];
p_f2(*pa)[10]; //pa是指向（包含10个p_f2类型指针的数组）的指针
//end
唉，实在太太太太长了，复制都麻烦
Shaift+Alt选取竖行，因为都要主函数，又不能一个题建一个项目太麻烦了，所以批量注释掉了，不过你们选取竖行就很好复制了，也可以删了注释线再复制
practice 1
//#include<iostream>
//using namespace std;
//
//double tiaohe(double a, double b);
//
//int main()
//{
// double a, b;
// cout << "Enter two numbers(quit by 0): ";
// cin >> a >> b;
// while (a != 0 && b != 0)
// {
// double th = tiaohe(a, b);
// cout << "Their harmonic mean is: " << th << endl;
// cout << "Enter two more numbers: ";
// cin >> a >> b;
// }
// cout << "Done!";
//
// return 0;
//}
//
//double tiaohe(double a, double b)
//{
// return 2 * a * b / (a + b);
//}
practice 2
//#include<iostream>
//using namespace std;
//
//const int SIZE = 10;
//
//int input(double*, int size);
//void display(double*, int size);
//void ave(double*, int size);
//
//int main()
//{
// double arr[SIZE];
// int size = input(arr, SIZE);
// display(arr, size);
// ave(arr, size);
//
// return 0;
//}
//
//int input(double* arr, int size)
//{
// int i = 0;
// for (i; i < size; i++)
// {
// double score;
// cout << "Enter the grade(quit by minus): ";
// cin >> score;
// if (!cin) //if不是循环，break直接跳出整个for循环
// {
// cin.clear();
// while (cin.get() != '\n')
// continue;
// cout << "Error!\n";
// break;
// }
// else if (score < 0)
// break;
// arr[i] = score;
// }
// return i;
//}
//
//void display(double* arr, int size)
//{
// for (int i = 0; i < size; i++)
// cout << arr[i] << " ";
//}
//
//void ave(double*arr, int size)
//{
// double sum=0;
// for (int i = 0; i < size; i++)
// sum += arr[i];
// cout << "The average is: " << sum / size;
//}
practice 3
//#include<iostream>
//
//using namespace std;
//
//struct box
//{
// char maker[40];
// float height;
// float width;
// float length;
// float volume;
//};
//
//void display(const box b)
//{
// cout << b.maker << endl;
// cout << b.height << endl;
// cout << b.width << endl;
// cout << b.length << endl;
// cout << b.volume << endl;
//}
//
//void volume(box* pb)
//{
// pb->volume = pb->height * pb->width * pb->length;
//}
//
//int main()
//{
// box bbb = { "yuetian",10,10,5 };
// display(bbb);
// volume(&bbb);
// cout << "The volume of yuetian's box is: " << bbb.volume;
//
// return 0;
//}
practice 4
//#include<iostream>
//using namespace std;
//
//long double probability(unsigned numbers, unsigned picks);
//
//int main()
//{
// unsigned total, choices;
// cout << "Enter the total number of choices on the game card and\n"
// "the number of picks allowed:\n";
//
// int i = 0;
// long double arr[2] = {};
// while (i < 2 && (cin >> total >> choices) && choices < total)
// //i<2的条件要放在前面，否则先判断输入，必须输入值才会继续判断，才会输出总概率
// {
// cout << "You have one change in ";
// arr[i] = probability(total, choices);
// cout << arr[i];
// cout << " of winning.\n";
// i++;
// }
// cout << "The final winning probability is: " << arr[0] * arr[1] << endl;
// cout << "Bye!";
// return 0;
//}
//
//long double probability(unsigned numbers, unsigned picks)
//{
// long double result = 1;
// long double n;
// unsigned p;
// for (n = numbers, p = picks; p > 0; n--, p--)
// result = result * n / p;
//
// return result;
//}
practice 5
//#include<iostream>
//
//using namespace std;
//
//unsigned long f(unsigned n)
//{
// long int factorial = 0;
// if (n == 0 || n == 1)
// factorial = 1;
// else
// factorial = n * f(n - 1);
// return factorial;
//}
//
//int main()
//{
// unsigned num = 0;
// cout << "Enter a number to calculate its factorial(q to quit): ";
// while (1)
// {
// if (!(cin >> num))
// {
// cin.clear();
// while (cin.get() != '\n')
// continue;
// cout << "Error!";
// break;
// }
// else
// cout << "The factorial is: " << f(num) << endl;
// }
// return 0;
//}
practice 6
//#include<iostream>
//
//using namespace std;
//
//int Fill_array(double* arr, int size)
//{
// int i = 0;
// for (i; i < size; i++)
// {
// cout << "Enter a double value(char to end early): ";
// if (cin >> arr[i]);
// else
// {
// cin.clear();
// while (cin.get() != '\n')
// continue;
// cout << "Error!";
// break;
// }
// }
// return i;
//}
//
//void Show_array(double* arr, int size)
//{
// for (int i = 0; i < size; i++)
// {
// cout << arr[i] << " ";
// }
// cout << endl;
//}
//
//void Reverse_array(double* arr, int size)
//{
// double substitute = 0;
// for (int i = 0; i < size/2; i++)
// {
// substitute = arr[i];
// arr[i] = arr[size - i - 1];
// arr[size - i - 1] = substitute;
// }
//}
//
//int main()
//{
// double arr[10];
// int size = Fill_array(arr, 10);
// Show_array(arr, size);
//
// Reverse_array(arr, size);
// Show_array(arr, size);
//
// Reverse_array(arr+1, size-2);
// Show_array(arr, size);
//
// return 0;
//}
practice 7
//#include<iostream>
//
//const int MAX = 5;
//
//double* fill_array(double arr[], double arrend[]);
//void show_array(const double arr[], const double arrend[]);
//void revalue_array(double r, double arr[], double arrend[]);
//
//using namespace std;
//
//int main()
//{
// double properties[MAX];
//
// double* end = fill_array(properties, properties + MAX);
// show_array(properties, end);
// if ((end - properties) > 0)
// {
// cout << "Enter revaluation factor: ";
// double factor;
// while (!(cin >> factor))
// {
// cin.clear();
// while (cin.get() != '\n')
// continue;
// cout << "Bad input;pleas enter a number: ";
// }
// revalue_array(factor, properties, end);
// show_array(properties, end);
// }
// cout << "Done!\n";
cin.get();
cin.get();
// return 0;
//}
//
//double* fill_array(double arr[], double arrend[])
//{
// double temp;
// int i;
// for (i = 0; i < arrend - arr; i++)
// {
// cout << "Enter value #" << i + 1 << ": ";
// cin >> temp;
// if (!cin)
// {
// cin.clear();
// while (cin.get() != '\n')
// continue;
// cout << "Bad input;input process terminated.\n";
// break;
// }
// else if (temp < 0)
// break;
// arr[i] = temp;
// }
// return arr + i;
//}
//
//void show_array(const double arr[], const double arrend[])
//{
// for (int i = 0; i < arrend - arr; i++)
// {
// cout << "Property#" << i + 1 << ": $";
// cout << arr[i] << endl;
// }
//}
//
//void revalue_array(double r, double arr[], double arrend[])
//{
// for (int i = 0; i < arrend - arr; i++)
// arr[i] *= r;
//}
practice 8
//#include<iostream>
//using namespace std;
//
//const int Seasons = 4;
//const char* Snames[4] =
//{ "Spring","Summer","Fall","Winter" };
//
//void fill1(double* expenses, int size);
//void show1(double* expenses, int size);
//
//struct expenses
//{
// double ex[Seasons];
//};
//
//void fill2(expenses* pex);
//void show2(expenses* pex);
//
int main()
{
double expenses[Seasons];
fill1(expenses, Seasons);
show1(expenses, Seasons);
return 0;
}
//
//int main()
//{
// expenses ex;
// fill2(&ex);
// show2(&ex);
// return 0;
//}
//
//void fill1(double* expenses, int size)
//{
// for (int i = 0; i < size; i++)
// {
// cout << "Enter " << Snames[i] << " expenses: ";
// cin >> expenses[i];
// }
//}
//
//void show1(double* expenses, int size)
//{
// double total = 0;
// cout << "EXPENSES\n";
// for (int i = 0; i < size; i++)
// {
// cout << Snames[i] << " $: " << expenses[i] << endl;
// total += expenses[i];
// }
// cout << "Total Expenses :$" << total << endl;
//}
//
//
//void fill2(expenses* pex)
//{
// for (int i = 0; i < Seasons; i++)
// {
// cout << "Enter " << Snames[i] << " expenses: ";
// cin >> pex->ex[i];
// }
//}
//
//void show2(expenses* pex)
//{
// double total = 0;
// cout << "EXPENSES\n";
// for (int i = 0; i < Seasons; i++)
// {
// cout << Snames[i] << " $: " << pex->ex[i] << endl;
// total += pex->ex[i];
// }
// cout << "Total Expenses :$" << total << endl;
//}
practice 9
//#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)
//{
// int i;
// cout << "Enter the data about student:\n";
//
// for (i = 0; i < n; i++)
// {
// cout << "The fullname: ";
// cin.getline(pa[i].fullname, Slen);
// cout << "The hobby: ";
// cin.getline(pa[i].hobby, Slen);
// cout << "The ooplevel: ";
// cin >> pa[i].ooplevel;
// cin.get();
// }
// return i;
//}
//
//void display1(student st)
//{
// cout << "The student's fullname: " << st.fullname << endl;
// cout << "The hobby: " << st.hobby << endl;
// cout << "The ooplevel: " << st.ooplevel << endl;
//}
//
//void display2(const student* ps)
//{
// cout << "The student's fullname: " << ps->fullname << endl;
// cout << "The hobby: " <<ps->hobby << endl;
// cout << "The ooplevel: " << ps->ooplevel << endl;
//}
//
//void display3(const student pa[], int n)
//{
// for (int i = 0; i < n; i++)
// {
// cout << "The "<<i+1<<" student's fullname: " << pa[i].fullname << endl;
// cout << "The hobby: " << pa[i].hobby << endl;
// cout << "The ooplevel: " << pa[i].ooplevel << endl;
// }
//}
//
//int main()
//{
// cout << "Enter class size: ";
// 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);
// delete[] ptr_stu;
// cout << "Done!\n";
// return 0;
//}
//practice 10
#include<iostream>
using namespace std;
double add(double a, double b)
{
return a + b;
}
double substract(double a, double b)
{
return a - b;
}
double multiply(double a, double b)
{
return a * b;
}
double calculate(double a, double b, double(*pf)(double, double))
{
return pf(a, b);
}
int main()
{
while (1)
{
double a = 0, b = 0;
cout << "Enter two number to chalculate(quit by char): ";
cin >> a >> b;
if (!cin)
{
cin.clear();
while (cin.get() != '\n')
continue;
cout << "Quit!\n";
break;
}
cout << "The result 1 is: " << calculate(a, b, add) << endl;
cout << "The result 2 is: " << calculate(a, b, substract) << endl;
cout << "The result 3 is: " << calculate(a, b, multiply) << endl;
}
return 0;
}
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