visual studio c++课堂作业这也不会啊，求解

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;
}

#include <stdio.h>
#include <math.h>
int main()
{
    float t=0,sum=0;
    int cnt = 0;
    while(t<=3.14)
    {
        cnt++;
        sum += sin(t);
        t+=0.01;
    }
    printf("%f",sum/cnt);
    return 0;
}