test_3_14、

test_3_14、

#define _crt_secure_no_warnings
#include <stdio.h>
#include <string.h>
int check()
{
	int a = 0x11223344;
	char* p = (char*) & a;
	if (*p == 0x44)
	{
		return 1;
	}
	return 0;
}
int main()
{
	int ret = check();
	if (ret == 1)
	{
		printf("小端\n");
	}
	else
	{
		printf("大端\n");
	}
	return 0;
}

int main3()
{
	a数组 存了1000个0 
	char a[1000] = { 0 };
	int i = 0;
	for (i = 0; i < 1000; i++)
	{
		a[0] = -1   -2    -3 ...... 
		a[i] = -1 - i;
	}
	printf("%d", strlen(a));
	return 0;
}
int main2()
{
	unsigned char a = 200;
	unsigned char b = 100;
	unsigned char c = 0;
	c = a+b;
	printf("%d %d", a + b, c);
	return 0;
}

char* mystrncpy(char *dest, const char * src,int n)
{
	int i = 0;
	for (i = 0; src[i] != '\0' && i < n; i++)
	{
		dest[i] = src[i];
	}
	if (i < n)
	{
		dest[i] = '\0';
	}
	return dest;
}
int main1()
{
	/*char dest[100] = "abcd";
	char* src = "abc";
	char * ret = mystrncpy(dest, src, 2);
	printf("%s\n",ret);*/

	/*char dest[100] = "abcd";
	char* src = "abc";
	char* ret = strncpy(dest,src,2);
	printf("%s\n", ret);*/

	unsigned int a = 0x1234;
	unsigned char b = *(unsigned char*)&a;
	printf("%x\n",b);
	return 0;
}