source file name: File4.cpp #include <fstream.h> #include <iostream.h> #include<conio.h> int main ()  {    char str[75];    ofstream fout;    fout.open("testout.txt");    clrscr();    cout <<"Writing to a text file:" << endl;    cout << "Please Enter your n…

source file name: OOfiles.cpp #include <iostream.h> #include<stdio.h> #include<conio.h> #include<iomanip.h> #include <fstream.h> class Student { char name[10]; int  rollno; char course[10]; public: void getdata() { cout<<"enter name: ";   cin>>name; cout<<&qu…

source file name: oddeven.cpp #include <iostream.h> #include<stdio.h> #include<conio.h> #include<stdlib.h> #include <fstream.h> int main() { int num[]={12,11,-50,60,113,178,45,100,145,500}; ofstream fout1,fout2; fout1.open("odd.txt"); fout2.open("even.txt"); …