Program that averages specified number of tests

[Fatal]

I sort of understand but I can't quite figure it out.
Somewhat like this...
have to do a for loop for how many times they say

#include <iostream.h>
#include <stdlib.h>

void main () *might be int main but my thing works with void*
{
int numtest;sumtest *don't know how to use it*
double avg;

cout <<"Enter number of tests"<<endl;
cin >>numtest;
{
for (i=????; i >=1; --)
{
cout <<"Insert score"<<endl;
*Here is where it is supposed to loop ^ how many times they wanted*
{
avg=(score+???????)/numtest
}
}
}
}
cout <<"You have A, B, C, D, or F as grade"<<endl;

[durban]

hmm, wow. Have you tried to read some tutorials? You said yourself you don't know how to use it..HELP ME HELP YOU

[Fatal]

Im in computer math...? Is it that bad, because we're using Turbo c for dos ide(ancient) I can't figure out the logic, thats the problem, not the code.