【简答题】Write a program to find the minimum value of a set of integer numbers (each number should be less than 1000). The program should continuously read floating-point numbers from the keyboard unless the user enters a negative number. For a given set of numbers, the program should output the minimum value of the numbers. The demo input & output is shown below (the blue font in the figure indicates the user input). Please upload the source code file of your program. We will compile and run it manually.