Create a C++ class for student having following members-Rollno,Name,No. of subjects,Marks of each subject (no. of subjects varies for each student) Write a parameterized constructor which initialises Rollno,Name & no. of Subjects & creates the array of marks dynamically.Display the details of all students with percentage & class obtained
#include<iostream.h>
#include<conio.h>
#include<malloc.h>
class
student
{
int rollno;
char
name[10];
int
tot_sub;
char
sub_name[10][30];
int
marks[10];
int
tot_marks;
float per;
// char grade;
public:
void
getdata()
{
cout<<"\n\n
Enter the Roll no: ";
cin>>rollno;
cout<<"\n\n
Enter the name: ";
cin>>name;
cout<<"\n\n
How many subject: ";
cin>>tot_sub;
for(int i=0;i<tot_sub;i++)
{
cout<<"\n\n
Enter the subject name; ";
cin>>sub_name[i];
cout<<"\n\n
Enter the marks: ";
cin>>marks[i];
}
}
public:void
display()
{
tot_marks=0;
cout<<"\n
Roll number:"<<rollno;
cout<<"\n
Student name: "<<name;
for(int
i=0;i<tot_sub;i++)
{
cout<<"\n
Subject name: "<<sub_name[i];
cout<<"\n
Subject mark: "<<marks[i];
tot_marks=tot_marks+marks[i];
}
per=tot_marks/tot_sub;
cout<<"\n\n
Total obtain marks: "<<tot_marks;
cout<<"\n\n
Percentge: "<<per;
if(per>=70)
cout<<"\n
\n Grade=Dist";
else if(per>=60)
cout<<"\n
\n Grade=A";
else
if(per>=50)
cout<<"\n
\n Grade=B";
else
if(per>=40)
cout<<"\n
\n Grade=Pass";
else
cout<<"\n
\n Grade=Fail";
}
};
void main()
{
clrscr();
student s;
s.getdata();
s.display();
getch();
}
Another Way
#include<conio.h>
#include<iostream.h>
#include<string.h>
class student
{
int rollno;
char
name[10];
int
subject;
int *marks;
public:
student()
{
}
student(int
rno,char n[],int s);
void
display();
};
student::student(int rno,char n[10],int s)
{
int i;
rollno=rno;
strcpy(name,n);
subject=s;
marks=new
int[s];
for(i=0;i<s;i++)
{
cout<<"enter
marks m"<<i+1<<" =";
cin>>marks[i];
}
}
void student::display()
{
int
i,n,total=0;
float per;
char
class1[10];
cout<<"\n
roll number="<<rollno;
cout<<"\n
name ="<<name;
cout<<"\n
number of subject="<<subject;
for(i=0;i<subject;i++)
total=total+marks[i];
per=total/subject;
if(per>70)
strcpy(class1,"first");
else
if(per>60)
strcpy(class1,"higher
second");
else
if(per>50)
strcpy(class1,"second");
else
if(per>40)
strcpy(class1,"pass");
else
strcpy(class1,"fail");
cout<<"\n
percentsge="<<per;
cout<<"\n
class obtained="<<class1;
}
int main()
{
student
s1[10];
int
rno,s,num,i;
char n[10];
clrscr();
cout<<"\n
enter how many student :";
cin>>num;
cout<<"\n
enter student details";
for(i=0;i<num;i++)
{
cout<<"\n
enter rollnumber =";
cin>>rno;
cout<<"enter
name =";
cin>>n;
cout<<"enter
how many subject =";
cin>>s;
student
s2(rno,n,s);
s1[i]=s2;
}
cout<<"Details
of all student ";
for(i=0;i<num;i++)
s1[i].display();
getch();
return 0; }
