自己实现内存拷贝函数memcpy

#include <stdio.h>//#include <stdlib.h>void *my_memcpy(void *a, const void *b, size_t n){while(n--){*((char*)a + n) = *((char*)b + n);}return a;}int main (){char str1 = {"hello"};char str2

陆星材

619人浏览 · 2021-05-07 14:25:09

陆星材 · 2021-05-07 14:25:09 发布

#include <stdio.h>
//#include <string.h>
//memmove
//参数：des为目标字符串，source()src为原字符串。

void *my_memcpy(void *dest, const void *src, size_t n)
{
    assert(dest != NULL && src != NULL);
    while(n--)
    {
        *((char *)dest + n) = *((char *)src + n);
        //((char *)src)[n] = ((char *)src)[n];
    }
    return (char *)dest;
}
int main ()
{
    char str1 = {"hello"};
    char str2 = {"abcd"};
    printf("my memcpy %s\n", my_memcpy(str1, str2, 3));  //abclo
    return 0;
}

memmove