C语言-strlen/memcpy/strcpy

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strlen不使用任何变量实现

int FunStrlen(const char *strDest)
{if(NULL == strDest){printf("NULL == strDest, return!\n");return -1;}if('\0' == *strDest){return 0;}else{return (1+FunStrlen(++strDest));}
}

	return *strDest ? 1+FunStrlen(++strDest) : 0;

	return ('\0' != *strDest) ? 1+FunStrlen(++strDest) : 0;

memcpy

void *FunMemcpy(void *dest, const void *src, size_t n)
{char *tmp=dest;const char *s=src;if(NULL==dest || NULL == src){return;}while(n--){*tmp++ = *s++;}return dest;
}

strcpy

char *FunStrcpy(char *dest, const char *src)
{char *tmp=dest;const char *s=src;if(NULL==dest || NULL == src){return NULL;}while('\0' != *s){*tmp++ = *s++;}return dest;
}

 

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