C++ Primer第八章课后编程题
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1.编写通常接受一个参数(字符串的地址),并打印该字符串的函数。不过,如果提供了第二个参数(int类型),且该参数不为0,则该函数打印字符串的次数将为该函数被调用的次数(注意,字符串的打印次数不等于第二个参数的值,而等于函数被调用的次数)。是的,这是一个非常可笑的函数,但它让读者能够使用本章介绍的一些技术。在一个简单的程序中使用该函数,以演示该函数是如何工作的。
代码:
#include<iostream>using namespace std;void show(const char * a, int b=0);void show(const char * a, int b){ static int uses = 0; int lim = ++uses; cout << "第" << uses << "次调用.\n"; if(b==0) lim = 1; for (int i=0; i<lim; i++) cout <<a<<endl;}int main(){ int i; const char * p = "hello world\n"; cout <<"输入函数调用次数:"; cin >> i; while(i>=0) { cout << "参数n为:" <<i; show(p, i); i--; } cout << "默认n为0:"; show(p); return 0;}
运行结果:
代码
#include<iostream>#include<cstring>using namespace std;const int MAX=60;struct CandyBar{ char brand[MAX]; double weight; int energy;};void init( CandyBar & cb, const char *br = "Millennium Munch", double we = 2.85, int ca = 350);void display(const CandyBar & cb);int main(){ CandyBar candybar; cout << "默认的candybar为:"<<endl; init(candybar); display(candybar); char newBrand[MAX]; double newWeight; int newEnergy; cout << "请输入新的candybar数据:"<<endl; cout << "brand: "; cin.get(newBrand, MAX); cout << "weight: "; cin >> newWeight; cout << "Energy: "; cin >> newEnergy; init(candybar, newBrand, newWeight, newEnergy); display(candybar); return 0;}void init(CandyBar &cb,const char *br, double we, int ca){ strcpy(cb.brand, br); cb.weight = we; cb.energy = ca;}void display(const CandyBar &cb){ cout << "新的candybar为:\n"; cout << "brand: " << cb.brand<<endl; cout << "weight: "<<cb.weight<<endl; cout << "energy: "<<cb.energy<<endl;}
运行结果
3、编写一个函数,它接受一个指向string对象的引用作为参数,并将该string对象的内容转换为大写,为此可使用函数toupper()。.然后编写一个程序,它通过使用一个循环让你能够用不同的输入来测试这个函数,该程序运行情况如下:
enter a string (q to quit) :go away
GO AWAY
next string (q to quit) : good grief !
GOOD GRIEF!
next string (q to quit) : q
bye.
代码:
#include<iostream>#include<string>using namespace std;void wordupper(string &a);int main(){ string str; cout << "Enter a string (1 to quit):"; getline(cin, str); int i=0; while (str != "q") { wordupper(str); cout << str <<endl; cout << "next string (q to quit):"; getline(cin, str); } cout << "bey!\n"; return 0;}void wordupper(string &a){ int i; while (a[i]) { a[i] = toupper(a[i]); i++; }}
运行结果:
代码:
#include<iostream>template<class T>T max5(T ar[]){ int n; T max = ar[0]; for (n=1; n<5; n++) if (ar[n] > max) max = ar[n]; return max;}const int lim = 5;int main(){ using namespace std; double ard[lim] = {-3.1, 8.1, -71.1, 34.4, 2.3}; int ari[lim] = {2, 3, 10, 9, 7}; double md; int mi; md = max5(ard); mi = max5(ari); cout << "Max double = " << md <<endl; cout << "Max int = " << mi <<endl; return 0;}
运行结果:
代码:
#include<iostream>#include<cstring>template<class T>T maxn(T ar[], int n){ int i; T max = ar[0]; for (i=1; i<n; i++) if(ar[i] > max) max = ar[i]; return max;}template<> const char * maxn(const char * arr[], int n){ const char * max = arr[0]; int i; for (i=1; i<n; i++) if(strlen(arr[i]) > strlen(max)) max = arr[i]; return max;}int main(){ using namespace std; int ari[6] = {8,4,2,7,10,22}; double ard[4] = {-3.1, 8.1, -71.1, 34.4}; const char * char_arr[5] = { "hello world!", "what your name?", "I love you", "you are wonderful", "hi" }; cout << "The max integer of array is:" << maxn(ari, 6) <<endl; cout << "The max double of array is:" << maxn(ard, 4) <<endl; cout << "The max string of array is:" << maxn(char_arr, 5) <<endl; return 0;}
运行结果:
代码:
#include <iostream>template <typename T>T ShowArray (T arr[], int n);template <typename T>T ShowArray (T * arr[], int n);struct debts{ char name[50]; double amount;};int main(void){ using namespace std; int things[6] = {13, 31, 103, 301, 310, 130}; struct debts mr_E[3] = { {"Ima Wolfe",2400.0}, {"Ura Foxe ",1300.0}, {"Iby Stout",1800.0} }; double* pd[3]; for (int i = 0; i < 3; i++) pd[i] = &mr_E[i].amount; cout<<"Listing Mr. E's counts of things:\n"; cout << ShowArray(things,6) <<endl; cout<<"Listing Mr. E's debts:\n"; cout << ShowArray(pd,3) <<endl; return 0;}template <typename T>T ShowArray (T arr[],int n){ using namespace std; T total = 0; cout<<"template A\n"; for (int i = 0; i < n; i++) total +=arr[i]; return total;}template <typename T>T ShowArray (T * arr[], int n){ using namespace std; T total = 0; cout<< "template B\n"; for (int i = 0; i < n; i++) total += *arr[i]; return total;}
运行结果:
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