matlab to C using rtInf

Hi guys ,I want to use rtInf in my application and simple example below.If oarg= number/0 ,I will print screen inf ,how the codes will sense this situation.What can I do?

void ciz(const double t[32], double oarg[32])
   20   {
   21     int k;
   22     for (k = 0; k < 32; k++) {
   23       oarg[k] = t[k] * t[k];
   24     }
   25   
   26     if (oarg[31] == rtInf) {
   27       oarg[30] = 1.0;
   28     }
   29   }