#include<stdio.h>
void my_strcpy(char* dest, char* src)
{
	while (*src!='\0')
	{
		*dest = *src;
		dest++;
		src++;
	}
	*dest = *src;//處理字符串的結(jié)束標(biāo)志'\0'
	//*dest = '\0';這樣處理并非是不行，但是會(huì)給閱讀代碼的造成一種錯(cuò)覺(jué)\
	即這個(gè)'\0'是自己放進(jìn)去的，而不是從源字符串拷貝進(jìn)去的
}
int main()
{
	char arr1[20] = { 0 };
	char arr2[] = "hello";
 
   my_strcpy(arr1, arr2);
	printf("%s\n", arr1);
	return 0;
}

#include<stdio.h>
#include<assert.h>
void my_strcpy(char* dest, char* src)
{
	assert(dest != NULL);
	assert(src != NULL);
   //當(dāng)然，此處也可以將兩個(gè)合并成一個(gè)：assert( dest && src )
	while (*src!='\0')
	{
		*dest = *src;
		dest++;
		src++;
	}
	*dest = *src;
}
int main()
{
	char arr1[20] = { 0 };
	char arr2[] = "hello";
 
   my_strcpy(arr1, arr2);
	printf("%s\n", arr1);
	return 0;
}

#include<stdio.h>
#include<assert.h>
void my_strcpy(char* dest, char* src)
{
	assert( dest && src );
	while(*dest++ = *src++)//'\0'的ascii碼值為0，為假，會(huì)退出循環(huán)
	{
		;
	}
}
int main()
{
	char arr1[20] = { 0 };
	char arr2[] = "hello";
   my_strcpy(arr1, arr2);
	printf("%s\n", arr1);
	return 0;
}

#include<stdio.h>
#include<assert.h>
char * my_strcpy(char* dest, const char* src)
//const可以防止源字符串被改變
{
	assert( dest && src );
	char* ret = dest;
	while(*dest++ = *src++)
	{
		;
	}
	return ret;
}
int main()
{
	char arr1[20] = { 0 };
	char arr2[] = "hello";
 
	printf("%s\n", my_strcpy(arr1, arr2));
	return 0;
}