Description : Write a C++ program to append data from abc.txt to xyz.txt file.
Last Answer : Assuming input file as abc.txt with contents "World" and output file named as xyz.txt with contents "Hello" have been already created. #include #include int main() { fstream f; ifstream fin; fin.open("abc.txt",ios::in); ofstream fout; fout.open("xyz.txt", ios::app); if (!fin) { cout