#if 1
//一C语言中使用宏来实现多态性
#include <stdio.h>
#define MAX(a, b) (((a) > (b)) ? (a) : (b))
int main()
{
int res1;
double res2;
res1 = MAX(5, 9);
res2 = MAX(5.6, 4.99);
printf("The max of 5 and 9 is : %d/n", res1 );
printf("The max of 5.5 and 4.9 is : %f/n",res2 );
return 0;
}
/*
The max of 5 and 9 is : 9
The max of 5.5 and 4.9 is : 5.600000
Press any key to continue
*/
#endif
#if 0
//二 C语言中使用指针实现的多态性
/* QSORT.C: This program reads the command-line
* parameters and uses qsort to sort them. It
* then displays the sorted arguments.
*/
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
//void qsort( void *base, size_t num, size_t width, int (__cdecl *compare )(const void *elem1, const void *elem2 ) );
int compare( const void *arg1, const void *arg2 );
void main( int argc, char **argv )
{
int i;
/* Eliminate argv[0] from sort: */
argv++;
argc--;
/* Sort remaining args using Quicksort algorithm: */
qsort( (void *)argv, (size_t)argc, sizeof( char * ), compare );
/* Output sorted list: */
for( i = 0; i < argc; ++i )
printf( "%s ", argv[i] );
printf( "/n" );
}
int compare( const void *arg1, const void *arg2 )
{
/* Compare all of both strings: */
return _stricmp( * ( char** ) arg1, * ( char** ) arg2 );
}
#endif
#if 0
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define MAX_NUMS 5
void qsort( void *base, size_t num, size_t width, int (__cdecl *compare )(const void *elem1, const void *elem2 ) );
int vstrcmp(const void *var1, const void *var2);
int vintcmp(const void *var1, const void *var2);
int main()
{
char *names[MAX_NUMS] = {
"qihailong",
"changchao",
"lixiaorang",
"xiyu",
"zhangjuntao"
};
int ages[MAX_NUMS] = {32, 45, 76, 21, 89};
int i = 0;
qsort(names, MAX_NUMS, sizeof(char *), vstrcmp);
qsort(ages, MAX_NUMS, sizeof(int), vintcmp);
for(i = 0; i < MAX_NUMS; ++i)
{
puts(names[i]);
}
for(i = 0; i < MAX_NUMS; ++i)
{
printf("%5d,", ages[i]);
}
puts("");
return 0;
}
int vstrcmp(const void *var1, const void *var2)
{
return strcmp(*(char **)var1, *(char **)var2);
}
int vintcmp(const void *var1, const void *var2)
{
return *(int *)var1 - *(int *)var2;
}
/*
changchao
lixiaorang
qihailong
xiyu
zhangjuntao
21, 32, 45, 76, 89,
Press any key to continue
*/
#endif
#if 0
Node * Search_List(Node *node, void const *value, int (*compare)(void const *, void const *))
{
while(node != NULL)
{
if(compare(&node->value, value) == 0)
{
break;
}
else
{
node = node->next;
}
}
return node;
}
int compare_ints(void const *a, void const *b)
{
if(*(int *)a == *(int *)b)
{
return 0;
}
else
{
return 1;
}
}
#endif
//三C语言中使用结构和联合来实现多态性