4.21静态算出人数与平均成绩

来源：互联网发布：汽车分级知乎编辑：程序博客网时间：2024/04/27 20:59

#include<iostream>#include<string>using namespace std;class student{public:student(string number,string name,float score);void show();void show_count_sum_ave();private:string number;string name;float score;static int count;    //学生人数static float sum;    //总成绩static float ave;    //平均成绩};student::student(string num,string nam,float sco)   //构造函数{number=num;name=nam;score=sco;++count;sum=sum+score;ave=sum/count;}int student::count=0;float student::sum=0.0;float student::ave=0.0;void student::show()         //显示学号、姓名、成绩{cout<<"该学生的学号："<<number<<endl;cout<<"该学生的姓名："<<name<<endl;cout<<"该学生的成绩："<<score<<endl<<endl;}void student::show_count_sum_ave()   //显示人数、总成绩、平均成绩{cout<<"学生人数："<<count<<endl;cout<<"总成绩："<<sum<<endl;cout<<"平均成绩："<<ave<<endl;}int main(){student stu1("001","lily",90);stu1.show();student stu2("002","smile",90);stu2.show();student stu3("003","rose",90);stu3.show();stu3.show_count_sum_ave();return 0;}

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