#include<stdio.h>void copy_string(char *from, char *to);main(){ char a[]="I am a teacher.";char b[]="You are a student.";printf("string_a=%s\n string_b=%s\n",a,b);copy_string(a,b);printf("\nstring_a=%s\nstring_b=%s\n",a,b);}__________横线上怎么填?
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