#include iostream#include fstreamusing namespace std;int main char ch; ifstream fp1s2datios_basebinary; if !fp1is_open coutcan not open s2datn; return 0; ofstream fp2

The program opens a binary file "s2.dat" for reading and "d2.dat" for writing. It then reads each character from "s2.dat" and checks if it is an uppercase letter. If it is, it converts it to lowercase by adding 32 (the difference between uppercase and lowercase ASCII values) and writes the lowercase character to "d2.dat". The program continues this process until it reaches the end of the file. Finally, it closes both files and exits.