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Program #1 #include<iostream> #include<windows.h> using namespace std; class student{ public: char FirstName[30],LastName[30],SC[20],grade; int RollNo,marks; void CALCULATE_GRADE(){ if(marks>=80) grade='A'; else if(marks>=65&&marks<80) grade='B'; else if(marks>=50&&marks<65) grade='C'; else if(marks>=40&&marks<50) grade='D'; else if(marks<40) grade='F'; } void Display(){ cout<<" First Name:"<<FirstName<<endl;      cout<<" Last Name:"<<LastName<<endl;      cout<<" Roll #:"<<RollNo<<endl;      cout<<" Section:"<<SC<<endl;      cout<<" Marks:"<<marks<<endl;         cout<<" Grade:"<<grade<<endl; } }; int main(...