c api example

// memcmp.c

#include <string.h>
#include <stdio.h>

int main()
{
	char *s1="Hello, Programmers!";
	char *s2="Hello, programmers!";
	int r;
	char *s="Golden Global View";
	char d[20],*p;
	char *rnew="new";
	int n;

	//     
	//memicmp memcmp      memicmp        。
	r=memcmp(s1,s2,strlen(s1));
	if(!r)
		printf("s1 and s2 are identical");
	else
		if(r<0)
			printf("s1 less than s2");
		else
			printf("s1 greater than s2");

	//     
	memcpy(d,s,strlen(s));
	d[strlen(s)]=0;
	printf("%s",d);

	//         ch     
	p=memccpy(d,s,'x',strlen(s));
	if(p)
	{
		*p='\0';      // MUST Do This
		printf("Char found: %s.
",d);
	}else
		printf("Char not found.
");

	// buf        count       ch。
	p=memchr(s,'P',strlen(s));
	if(p)
		printf("%s",p);
	else
		printf("Not Found!");
	// src        count    dest      。
	memmove(s,s+7,strlen(s)-7);
	s[strlen(s)-7]=0;
	printf("%s",s);

	//     s       c   
	strchr(s,'V');
	if(p)
		printf("%s",p);
	else
		printf("Not Found!");
	//    s1   s2       。
	n=strcspn(s,rnew);
	printf("The first char both in s1 and s2 is: %c",s[n]);

	//     s
	p=strdup(s);
	printf("%s",p);
	//    s         strupr      
	printf("%s",strlwr(s));

	//   s            
	printf("%s
%s",s,strrev(strdup(s)));

	//    haystack   needle        
	p=strstr(s,rnew);
	if(p)
		printf("%s",p);
	else
		printf("Not Found!");
	//           。s        ，delim       。
	strcpy(d," ");
	p=strtok(s,d);
	while(p)
	{
		printf("%s
",s);
		strtok(NULL,d);
	}

	//   num_elems    elem_size         
	p=(char *)calloc(100,sizeof(char));
	if(p)
		printf("Memory Allocated at: %x",p);
	else
		printf("Not Enough Memory!
");

	free(p);

	p=(char *)malloc(100);
	if(p)
		printf("Memory Allocated at: %x",p);
	else
		printf("Not Enough Memory!
");
	//  mem_address          newsize  
	p=(char *)realloc(p,256);
	if(p)
		printf("Memory Reallocated at: %x",p);
	else
		printf("Not Enough Memory!
");

	free(p);


	getchar();
	return 0;
}