Polymorphism in C Language

# If 1

// Using macros in C language for Polymorphism

# 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

// Polymorphism implemented by pointer in the second C Language
/* 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

// Use structure and combination in C to realize Polymorphism