代码

#define _CRT_SECURE_NO_WARNINGS#include <string.h>
#include <stdio.h>char string[] = "A string\tof ,,tokens\nand some  more tokens";
char seps[] = " ,\t\n";
char *token;int main(void)
{printf("Tokens:\n");// Establish string and get the first token:token = strtok(string, seps); // C4996// Note: strtok is deprecated; consider using strtok_s insteadwhile (token != NULL){// While there are tokens in "string"printf(" %s\n", token);// Get next token: token = strtok(NULL, seps); // C4996}
}/*int i = -1;do{pDest[++i] = pSource[i];} while (pSource[i]);
*/
void StringCopy(char* pDest, char* pSource) //微软源码
{int i = -1;while (pDest[++i] = pSource[i]);
}void StrCopy(char* pDest, char* pSrc)
{while(*pDest=*pSrc){++pDest;++pSrc;}
}void StrCat(char* pDest,char* pSrc)
{int i=0,j=0;while(pDest[i]!=0)++i;while(pDest[i++]=pSrc[j++]);
}void StrCat1(char* pDest, char* pSrc)
{while (*pDest)++pDest;while (*pDest = *pSrc)++pDest, ++pSrc;
}int StrCmp(char* s1, char* s2)
{unsigned char* p1 = (unsigned char*)s1;unsigned char* p2 = (unsigned char*)s2;while (*p1 && *p1++ == *p2++);return *p1 - *p2;
}

• %p %x %X 区别，%p 更好看
• 指针相减，p1-p2 = 地址之差/sizeof(类型)

运行结果