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==============ÕâÊÇʹÓÃÊý×é±íʾ·¨Õý³£ÔËÐеİ汾===================
#include<stdio.h>

copy_string(char from[],char to[]){
int i=0;
while(from[i]!='\0'){
to[i] = from[i];
i++;
}
to[i] = '\0';
}

main(){
char a[] = "I am a teacher.";
char b[] = "you are a student.";
printf("string a is:%s\nstring b is:%s\n",a,b);
copy_string(a,b);
printf("string a is:%s\nstring b is:%s\n",a,b);
}

=================================================================

==================ÕâÊÇʹÓÃÖ¸Õë±íʾ·¨±¨´íµÄ°æ±¾===================
#include<stdio.h>

copy_string(char from[],char to[]){
int i=0;
while(from[i]!='\0'){
to[i] = from[i];
i++;
}
to[i] = '\0';
}

main(){
//char a[] = "I am a teacher.";
//char b[] = "you are a student.";
char *a = "I am a teacher.";
char *b = "you are a student.";

printf("string a is:%s\nstring b is:%s\n",a,b);
copy_string(a,b);
printf("string a is:%s\nstring b is:%s\n",a,b);
}

=============================================================

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0xc0000005 Access Violation

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