Can I return a double or float in a function with two integer parameters?

The first problem is that you haven’t declared your function before using it in main(). Provide a declaration or prototype before calling it.

double avg(int a[], int *n);
int main() { 
...

Second, in the first implementation, you are not storing the return value of the function

avg (arr, & size) ; // useless statement

Just store the return value into a variable and print it, it will work as expected

double average = avg (arr, & size);
printf("%lf", average);

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