radix sort

[صمتي]

I want to order this program by name in descinding order.

#include <iostream.h>
#include <stdio.h>
#include <conio.h>
#include <string.h>

#define MAX 10

struct std{
char name[20];
int age,year;
};

class radixsort{
    struct std arr[MAX];
    int n,i;
    public:
    int a[];
    int b[];

    void getdata();
    void showdata();
    void sortLogic();
};

void radixsort :: getdata(){
    cout<<"How many elements you require : ";
    cin>>n;
    for(int i=0;i<n;i++){

cout<<"enter name: ";
        gets(arr[i].name);

cout<<"enter age: ";
        cin>>arr[i].age;

cout<<"enter year: ";
        cin>>arr[i].year;

cout<<endl;

}
}

void radixsort :: showdata(){
    cout<<"\n--Display--\n";
    for(int i=0;i<n;i++){
        cout<<"name:"<<arr[i].name<<endl;
        cout<<"age:"<<arr[i].age<<endl;
        cout<<"year:"<<arr[i].year<<endl;
}
}

void radixsort :: sortLogic(){
int m=a[0],exp=1;
for(int i=1;i<n;i++)
{
if(strcmp(arr[i].name,arr[i+1].name)>m)
m= strcmp(arr[i].name,arr[i+1].name);
}
while(m/exp>0){
  int bucket[10]={0};
  for(i=0;i<n;i++)
  bucket[strcmp(arr[i].name,arr[i+1].name)/exp%10]++;

  for(i=1;i<10;i++)
   bucket[i]+=bucket[i-1];

   for(i=n-1;i>=0;i--)
   b[--bucket[strcmp(arr[i].name,arr[i+1].name)/exp%10]]=strcmp(arr[i].name,arr[i+1].name);

   for(i=0;i<n;i++)
    strcmp(arr[i].name,arr[i+1].name) == b[i];
    exp*=10;



 }
}

void main(){
    clrscr();
    cout<<"\n*****Radix Sort*****\n";
    radixsort obj;
    obj.getdata();
    obj.sortLogic();
    obj.showdata();
    getch();
}