write a c++ program to create a class student containing data member

/*write a c++ program to  create a class student containing data member
-rollno
-name
-marks1,marks2,marks3
write a necessary member function
1.to accept details
2.to display details of one student
3.to display details of all student
*/
#include<conio.h>
#include<iostream.h>
#include<string.h>
class student
{
public:int rollno,m1,m2,m3;
char name[30];
public:void details()
       {
       int cnt=0;
       cout<<"\nenter the student information:-"<<cnt+1;
       cout<<"\nenter the rollno:-";
       cin>>rollno;
       cout<<"\nenter the name:-";
       cin>>name;
       cout<<"\nenter the marks of three student:-";
       cin>>m1>>m2>>m3;
       }
       void details(char sname[30])
       {
       cout<<"\nrollno:-"<<rollno
       <<"\nname:-"<<sname
       <<"\nmarks1:-"<<m1
       <<"\nmarks2:-"<<m2
       <<"\nmarks3:-"<<m3;
       }
       void details(int rno,char n[20],int mrk1,int mrk2,int mrk3)
       {
       cout<<"\nrollno:-"<<rno
       <<"\nname:-"<<n
       <<"\nmarks1:-"<<mrk1
       <<"\nmarks2:-"<<mrk2
       <<"\nmarks3:-"<<mrk3;
       }
       };
int main()
{
student s[3];
int i,cmp,ans=1;
char sn[30];
clrscr();
for(i=0;i<3;i++)
{
s[i].details();
}
cout<<"\nenter student name whose details is to be display:-";
cin>>sn;
cout<<"\ndetails of one student:-";
for(i=0;i<3;i++)
{
cmp=strcmp(sn,s[i].name);
if(cmp==0)
{
ans=0;
s[i].details(sn);
}
}
if(ans!=0)
cout<<"you entered wrong name";
cout<<"\ndetails of all students:-";
for(i=0;i<3;i++)
s[i].details(s[i].rollno,s[i].name,s[i].m1,s[i].m2,s[i].m3);
getch();
return 0;
}
/*
enter the rollno:-12
                                                                               
enter the name:-peer
                                                                               
enter the marks of three student:-3                                            
4                                                                              
2                                                                              
                                                                               
enter the student information:-2                                               
enter the rollno:-11                                                           
                                                                               
enter the name:-ajay                                                           
                                                                               
enter the marks of three student:-4                                            
5                                                                              
6                                                                              
                                                                               
enter the student information:-3                                               
enter the rollno:-112                                                          
                                                                               
enter the name:-manik
                                                                               
enter the marks of three student:-12                                           
4                                                                              
5                                                                              
                                                                               
enter student name whose details is to be display:-peer                        
                                                                               
details of one student:-                                                       
rollno:-12                                                                     
name:-peer                                                                     
marks1:-3                                                                      
marks2:-4                                                                      
marks3:-2                                                                      
details of all students:-                                                      
rollno:-12                                                                     
name:-peer                                                                     
marks1:-3                                                                      
marks2:-4                                                                      
marks3:-2                                                                      
rollno:-11
name:-ajay
marks1:-4
marks2:-5
marks3:-6
rollno:-112
name:-manik
marks1:-12
marks2:-4
marks3:-5
*/