jmp_buf jumper;
int SomeFunction(int a, int b)
{
  if (b == 0) // can't divide by 0
    longjmp(jumper, -3);
  return a / b;
}
void main(void)
{
  if (setjmp(jumper) == 0)
  {
    int Result = SomeFunction(7, 0);
    // continue working with Result
  }
  else
    printf("an error occurred\n");
}

Example 1: A simple error-handling approach based on setjmp() and longjmp().