Please write a program c++ language that gives the number of possibilities that can be formed from four digits of numbers between 0 - 9, for example, XXXXXXXXXX XXXXXXXXXX XXXXXXXXXXor XXXXXXXXXX...

_{Please write a program c++ language  that gives the number of possibilities that can be formed from four digits of numbers between 0 - 9, for example, 9999 8888 7777 6666 5555 4444 3333 2222 1111 0000 or 9876 9800 9822 8800 7211 9022 9522 and so on. I think the number of numbers that can be formed from 4 different numbers and contain two numbers from zero to nine is 10,000 digits.}