Quick Sort

1. Read the manpage of qsort().
2. According to the type revealed in the function prototype, design a function cmpFunc() so that the following code can sort an array of strings in alphabetical order.

   
   #include <iostream>
   using std::cin;
   using std::cout;
   
   void show_array(char* a[], int n)
   {
       int i;
       for (i=0; i<n; i++)
           cout << a[i] << '\n';
       cout << "=====\n";
   }
   
   int main()
   {
       const int N = 10;
       char word[N][20];
       char* a[N];
   
       for (int i=0; i<N; i++)
       {
           cin >> word[i];
           a[i] = &word[i][0];
       }
   
       qsort(a, N, sizeof(a[0]), cmpFunc);
       show_array(a, N);
       return 0;
   }
   
   

Apple
apple
Alice
banana
BANANA
Coconut
Guava
Watermelon
Papaya
Grape
=====
Alice
Apple
BANANA
Coconut
Grape
Guava
Papaya
Watermelon
apple
banana