İşaretçi Fonksiyonlar(Teknik İngilizcesi iyi olan birisi yardım edebilir mi ?)

#include <stdio.h> 
  void add(int a, int b) 
  { 
      printf("Addition is %d\n", a+b); 
  } 
  void subtract(int a, int b) 
  { 
      printf("Subtraction is %d\n", a-b); 
  } 
  void multiply(int a, int b) 
   
  { 
      printf("Multiplication is %d\n", a*b); 
  } 
   int main() 
   
  { 
      // fun_ptr_arr is an array of function pointers 
     [b] void (*fun_ptr_arr[])(int, int) = {add, subtract, multiply};//Sanırım burada switch kase yapısı kurulmuş.[/b] //-->? 
   
      unsigned int ch, a = 15, b = 10; 
       printf("Enter Choice: 0 for add, 1 for subtract and 2 " 
   
              "for multiply\n"); 
      scanf("%d", &ch); 
       if (ch > 2) return 0; 
   
       (*fun_ptr_arr[ch])(a, b); 
   
       return 0; 
   
  }

// A simple C program to show function pointers as parameter 
  #include <stdio.h> 
    
  // Two simple functions 
  void fun1() { printf("Fun1\n"); } 
  void fun2() { printf("Fun2\n"); } 
    
  // A function that receives a simple function 
  // as parameter and calls the function 
  void wrapper(void (*fun)()) 
  { 
      fun(); 
  } 
    
  int main() 
  { 
      wrapper(fun1); 
      wrapper(fun2); 
      return 0; 
  }

// An example for qsort and comparator 
  #include <stdio.h> 
  #include <stdlib.h> 
    
  // A sample comparator function that is used 
  // for sorting an integer array in ascending order. 
  // To sort any array for any other data type and/or 
  // criteria, all we need to do is write more compare 
  // functions.  And we can use the same qsort() 
  int compare (const void * a, const void * b) 
  { 
     [b]return ( *(int*)a - *(int*)b );[/b] //-->? 
   
  } 
    
  int main () 
  { 
    int arr[] = {10, 5, 15, 12, 90, 80}; 
    int n = sizeof(arr)/sizeof(arr[0]), i; 
    
  [b] 
   qsort (arr, n, sizeof(int), compare);[/b]  //-->? 
   
    
    for (i=0; i<n; i++) 
       printf ("%d ", arr[i]); 
    return 0; 
  }