A moving average would look like this:
Average = 0.0 (Use doubles)
Number of elements = 0.0
Total = 0.0
While there are more numbers:
Ask for a new number.
Add new number to total.
Add 1 to number of elements.
Divide total by number of elements.
Store in average.
Loop
And here is a lovely snippet of code for you to get you started.
#include <stdio.h>
int main(){
double average=0;
double sum=0;
double entry;
char keepGoing='y';
while(keepGoing=='y'){
printf("Please input your value: ");
http://www.cplusplus.com/reference/clibrary/cstdio/fscanf/
// Do something awesome.
printf("Keep going?");
//http://www.cplusplus.com/reference/clibrary/cstdio/fscanf/
}
return 0;
}