求助 C 中的一个小问题

#include <stdio.h> #include <curses.h> int main() { void copy_string(char from[], char to[]); char a[] = "I am a teacher"; char b[] = "you my student"; char * from = a, * to = b; printf("string a = %s\n string b = %s\n",a,b); printf("\ncopy string a to string b:\n"); copy_string(from, to); printf("string a = %s\nstring b = %s\n",a,b); return 0; } void copy_string(char from[],char to[]) { int i = 0; while(from[i]!='\0') { to[i++]=from[i++]; } to[i]='\0'; } 

第一段输出结果为：

string a = I am a teacher
string b = you my student

copy string a to string b:
string a = I am a teacher
string b = om aytsauhert

#include <stdio.h> #include <curses.h> int main() { void copy_string(char from[], char to[]); char a[] = "I am a teacher"; char b[] = "you my student"; char * from = a, * to = b; printf("string a = %s\n string b = %s\n",a,b); printf("\ncopy string a to string b:\n"); copy_string(from, to); printf("string a = %s\nstring b = %s\n",a,b); return 0; } void copy_string(char from[],char to[]) { int i = 0; while(from[i]!='\0') { to[i]=from[i]; i++; } to[i]='\0'; } 

想请教的问题是：

 to[i]=from[i]; i++; 

改成了

 to[i++]=from[i++]; 

之后为什么结果是不对的？