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#include <float.h>

long double big_d;
double d_a;
double d_b;
float f_a;
float f_b;

/* initializationsInitializations */

if (d_a > FLT_MAX || d_a < -FLT_MAX) {
  /* Handle error condition */
} else {
  f_a = (float)d_a;
}
if (big_d > FLT_MAX || big_d < -FLT_MAX) {
  /* Handle error condition */
} else {
  f_b = (float)big_d;
}
if (big_d > DBL_MAX || big_d < -DBL_MAX) {
  /* Handle error condition */
} else {
  d_b = (double)big_d;
}