C++ Prime Plus 第六版 第七章 函数——C++模块 编程练习 参考答案 详细版

以下答案本人在linux vscode中均已亲自测试编译通过，完美运行．

复习题８：

#include<iostream>
using namespace std;
int replace(char * str, char c1, char c2);
int main()
{
    const int size = 20;
    char str[size] = "ajajjaca";
    cout << str << endl;
    replace(str,'a','@');
    cout << str << endl;
}
int replace(char * str, char c1, char c2)
{
    int count =0;
    for(int i=0; str[i] != '\0'; i++ )
    {
        if(str[i] == c1)
        {
            str[i] = c2;
            count++;
        }
    }
    cout << count << endl;
}

复习题１２：

#include<iostream>
using namespace std;
struct appliant
{
    char name[30];
    int credit_ratings[3];
};
void show1(appliant see);
void show2(appliant * see);
int main()
{
    appliant wu{"wu1234456",1,2,3};
    show1(wu);
    show2(&wu);
}
void show1(appliant see)
{
    cout << see.name << endl;
    for(int i=0; i < 3; i++ )
        cout << see.credit_ratings[i] << endl;
}
void show2(appliant * see)
{
    cout << see->name << endl;
    for(int i=0; i < 3; i++ )
        cout << see->credit_ratings[i] << endl;
}

编程练习：

７.１

#include<iostream>
using namespace std;
double funave(double x, double y);
int main()
{
    double x, y,ave;
    cout << "请输入两个数：";
    while(cin >> x >> y)
    {
        if(0 == x || y == 0)
            break;
        ave = funave(x, y);
        cout << "调和平均数＝" << ave << endl;
        cout << "请输入两个数：";
    }
}
double funave(double x, double y)
{
    double ave = 0.0;
    ave = 2.0 * x * y / (x + y);
    return ave;
}

７.２

#include<iostream>
using namespace std;
void input(double score[],int size);
void show(double score[]);
double funave(double score[]);
int main()
{
    const int size = 10;
    double score[size]{0};
    double ave = 0;
    input(score,size);
    show(score);
    ave = funave(score);
    cout << "\n平均成绩：" << ave << endl; 
}
void input(double score[], int size)
{
    int i = 0;
    cin >> score[i];
    while((cin.get() != '\n') && (i < size))  //可以提前结束输入
    {
        i++;
        cin >> score[i];
    }
}
void show(double score[])
{
    int i = 0;
    while(score[i] != 0