sqrt() of int type in C

Question

I am programming in the c language on mac os x. I am using sqrt, from math.h, function like this:

int start = Data -> start_number;
double localSum;

for          


        

Answer 1

C-compilers do some automatic casting with double and int. you could also do the following:

int start = Data -> start_number;
int localSum;

for (start; start <= end; start++) {
   localSum += sqrt(start);
}

Even if the localSum is an int this will still work, but it will always cut of anything beyond the point.
For example if the return value of sqrt() is 1.365, it will be stored as a simple 1.