c++输入输出问题

Question

（1）输入一个班20人的成绩。（2）找出最高分。（3）找出最低分。（4）计算平均分。（5）统计优秀，及格和不及格的人数。大于80优秀，60到80及格，否则不及格。

Answer 1

#include<iostream>

using namespace std;

int main(){

int a[20]={60,30,30,100,10,90,80,30,0,32,60,100,99,100,100,12,34,56,100,99};

int max=0,min=0,sum=0,outstanding=0,good=0,fail=0;

double average=0.0;

for(int i=0;i<20;i++){

//cin>>a[i];

if(a[i]<0){

cout<<"wrong data,input again"<<endl;

i--;

}

else{

sum+=a[i];

if(max<a[i])

max=a[i];

if(min>a[i])

min=a[i];

if(a[i]>80)

outstanding++;

else if(a[i]<60)

fail++;

else{

good++;

}

}

}

average=sum/20.0;

cout<<"最高分为:"<<max<<endl;

cout<<"最低分为:"<<min<<endl;

cout<<"平均分为:"<<average<<endl;

cout<<"优秀人数为:"<<outstanding<<endl;

cout<<"合格人数为:"<<good<<endl;

cout<<"不合格人数为:"<<fail<<endl;

return 0;

}