in C++ please.

3 Write a C++ program that accept 4 positive real numbers and compute the dif- ference between the highest number and the lowest number. All input numbers should be real numbers between 0 and 1,000,000. Note that you are not allowed to use if-else. Sample Output Input for real numbers between 0 and 1,000,000. 6739 2.4774 999903.99 56382.00001 Difference between the highest and lowest number: 999901.5126