In C, can you do this? int i; i = get_long() % 20;

unsigned long get_long(); //returns some crazy large unsigned long

int i; 

i = get_long() % 20;

The value of the right hand side should ALWAYS be big enough to fit into an integer because the possible values are only {0, 1, 2 .... 18, 19}.

Can I assume that the compiler can convert that unsigned long right hand side to an integer on the left hand side?