C++ Primer Plus 第6版第8章编程练习答案

8-1
#include <iostream>
void play(char *ptr,int);
void play(char *ptr);
int k=1;//external variable;
int main() {
   
   
    using namespace std;
    cout<<"Enter a string:"<<endl;
    char str[50];
    cin.getline(str,50);
    play(str);
    play(str,0);
    play(str,20);
    play(str);
    return 0;
}
void play(char *ptr,int n)
{
   
   
    if(n)
        for(int i=0;i<k;++i)
            std::cout<<ptr<<std::endl;
    ++k;
}
void play(char *ptr)
{
   
   
    std::cout<<ptr<<std::endl;
    ++k;
}

8-2
#include <iostream>
#include <string>
using namespace std;
struct CandyBar{
   
   
    string name;
    float weight;
    int calories;
};
const char *ar="Millennium Munch";
void func(CandyBar & a,const char* ptr="Millennium Munch",double n=2.85,int m=350);
void func1(CandyBar & a);

int main() {
   
   
    CandyBar candy;
    func(candy);
    func1(candy);
    func(candy,"holle world!",3.12,222);
    func1(candy);
    return 0;
}
void func(CandyBar & a