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例：s指向字符串"abcdef"，经过移动后s指向的字符串为"defabc"
方法一：
#include <stdio.h> void Shift (char *str){ char str1[3] = {*str, *(str+1), *(
str+2)}; int i,j; for(i=3; *(str+i); i++){ *(str+(i-3)) = *(str+i); } for(j=i-3,
i=0; i<3; i++){ *(str+(j++)) = str1[i]; } } void main () { char str[100]; printf
("请输入一个字符串："); gets(str); Shift(str); printf("移动后：%s", str); }
方法二：
注意：宏定义处要指定字符个数
#include <stdio.h> #define MAXS 6 void Shift( char *s ){ int i,m=MAXS-3; char a
[3]; for(i = 0; i < 3;i++) a[i] = s[i]; for(i=3;s[i]; i++) s[i-3]=s[i]; for( i =
0; i < 3;i++) s[m++] = a[i]; } void main(){ char s[MAXS]; printf("请输入一个字符串：");
gets(s); Shift(s); printf("移动后：%s", s); }
