#include"stdio.h" #include"string.h" void fun(char *w, int n){ char t, *s1, *s2; s1 = w; s2 = w+n-1; while(s1<s2){ t=*s1++; *s1=*s2--; *s2=t; } } void main(){ static char *p = "1234567"; fun(p,strlen(p)); printf("%s",p); }