/*文件名:exam8_21.cpp*/
#include <stdio.h>
#define Max 10
char *strcat(char *s1,char *s2)
{
	char *p=s1;          	/*用指針變量p保存s1串的首地址*/
	while (*s1) s1++;      	/*讓s1指向'\0'時循環結束*/
	while (*s1++=*s2++);  	/*將s2所有字符復制到s1之后*/
	return(p);              /*返回指針值*/
}
main()
{
	char *s,s1[Max]="ABC",s2[Max]="abc";
	s=strcat(s1,s2);
	printf("s1=%s,s2=%s\n",s1,s2);
	printf("s=%s\n",s);
}