请你帮帮我解一下这道题吧

#include <stdio.h>
int main()
{
    int i,n;
    double s = 0,t;
    scanf("%d",&n);
    for(i=0;i<n;i++)
    {
        scanf("%lf",&t);
        s += t;
    }
    s = s/t;
    printf("%.2lf",s);
    return 0;
}

#include <stdio.h>
int main()
{
    int n,i,m;
    float avg = 0;
    scanf("%d",&n);
    for(i=0;i<n;i++)
    {
        scanf("%d",&m);
        avg += m;
    }
    printf("%.2f",avg/n);
    return 0;
}