visual studio c++课堂作业这也不会啊，求解

Question

Answer 1

c++实现：

#include <iostream>
#include <cmath>
using namespace std;
int main(){
    double i=0.0,sum=0.0;
    int count=0;
    for(;i<=3.14;i+=0.01){
        sum+=sin(i);
        count++;
    }
    cout<<sum/count<<endl;
    return 0;
}