Real numbers on altera fpga de5

The real type is not synthesisable at all. So forget about using it on an FPGA.

Altera provides floating point cores for all FP operations. But why do you need floating point? FPGAs are not designed for floating point, so they take up a large amount of logic and have high latency to keep the clock frequencies high. Fixed point is much better because it is basically integer arithmatic that FPGAs are designed for.