例10.20用函数调用实现字符串的复制。
(1) 用字符数组作参数。
void 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=%s\nstring b=%s\n",a,b);
copy-string(a,b);
printf("\nstring a=%S\nstring b=%s\n",a,b);  

 程序运行结果如下:
string-a=I am a teaCher.
string-b=you are a StuDent.
string-a=I am a teaCher.
string-b=I am a teaCher.