C-language function pointer: Gets the maximum of any type array

1#include <stdio.h>2  3 //{3,5,8,7,6}4 /*5 int max (int *nums,int len)6 {7 int i;8 int max=nums[0];//assumes that the No. 0 element is a maximum value9 For (i=1;i<len;i++)Ten     { One int value = *nums; A if (Value>max) -         { - max = value;//If a larger than Max is found, Max gives way the         } - nums++; -     } - return max; + } - */ +   Atypedefstruct_dog at { -     Char*name; -     intAge ; - } Dog; -typedefint(*comparefunc) (void* Data1,void*data2); - //the first address of data array to be compared, number of bytes of unitesize cell in //Size: The length of the data. {1,3,5,6}:size=4 - //Compare the data that data1 and Data2 point to, to //returns a positive number if DATA1>DATA2 + void* MAX (void* Data,intUnitSize,intsize, - comparefunc func) the { *     inti; $     Char*ptr = (Char*) data;Panax Notoginseng     Char*max = ptr;//assume that the first element is the maximum value -      for(i=1; i<size;i++) the     {       +         Char* item = ptr+i*unitsize;//calculates the first address of the first element A         if(func (Item,max) >0)//if item is greater than Max the         //How to take a few bytes to compare is inside the func thing +         { -Max =item; $         } $     } -     returnMax//the first address of the maximum value - } the   - //Data1 is the first address to be compared to a number.Wuyi intIntcompare (void* Data1,void*data2) the { -     int* Ptr1 = (int*) data1; Wu     int* PTR2 = (int*) data2; -     inti1=*ptr1; About     inti2=*ptr2; $     returnI1-I2; - } -   - intDogcompare (void* Data1,void*data2) A { +dog* Dog1 = (dog*) data1; thedog* dog2 = (dog*) data2; -     return(dog1->age)-(dog2->Age ); $     //return (Dog2->age)-(dog1->age); the } the   the intMainintargcChar*argv[]) the { -     /* in int nums[] = {3,5,8,7,6}; the int *pmax = (int *) max (nums,sizeof (int), sizeof (nums)/sizeof (int), the intcompare); About int max = *pmax; the printf ("%d\n", max); the     */ the     /*dog dogs[] ={{"sand skin", 3},{"sausage", 10},{"Husky", 5},{"Jing Ba", 8},{"Big Dog", 2};*/ +     /*Dog *pdog = (dog *) max (dogs,sizeof (dog), - sizeof (dogs)/sizeof (Dog), dogcompare); the printf ("%s=%d", pdog->name,pdog->age);*/Bayi     /*qsort (dogs,sizeof (dogs)/sizeof (dog), sizeof (dog), dogcompare); the int i; the For (i=0;i<sizeof (dogs)/sizeof (DOG); i++) -     { - Dog dog = dogs[i]; the printf ("%s=%d|", dog.name,dog.age); the     }*/ the     intNums[] = {3,5,8,7,6}; theQsort (Nums,sizeof(nums)/sizeof(int),sizeof(int), - intcompare); the     inti; the      for(i=0;i<sizeof(nums)/sizeof(int); i++) the     {94         intn =Nums[i]; theprintf"%d|", n); the     } the  98     return 0; About}

C-language function pointer: Gets the maximum of any type array