#include<stdio.h>
#include<string.h>
int main()
{
char arr1[20] = "xxxxxxxxxxxx";
char arr2[] = "hello";
strcpy(arr1, arr2);
printf("%s\n",arr1);
return 0;
}
/*复杂版*/
void my_strcpy(char* dest, char* str)
{
while (*str != '\0')
{
*dest = *str;
*dest++;
*str++;
}
*dest = *str;
}
/*优化版*/
#include<assert.h>
void my_strcpy(char* dest, const char*str)
{
//const修饰变量，称为常变量，不能被修改，但还是变量
//assert(*str != null);//断言
while (*dest++ = *str++)
{
;
}
}
int main()
{
char arr1[20] = "xxxxxxxxxxxx";
char arr2[] = "hello";
my_strcpy(arr1, arr2);
printf("%s\n", arr1);
return 0;
}
int main()
{
int num = 10;
int n = 100;
int* p = #
p = &n;
*p = 20;
printf("%d\n", num);
printf("%p\n", num);
printf("%p\n", n);
printf("%d\n", n);
printf("%p\n", num);
return 0;
}
