一下是我写的程序：___include <stdio.h> void main (){char c;int i;printf ("请输入字符串：\n");for (i=0;(c=getchar())!='\n';){if (c>='a'&&c<='z') c=c-32;else if (c>='A'&&c<='Z') c=c+32;printf ("%c",c);} printf ("\n\n");} ___...