#include<stdio.h>
void main()
{
char c1;
for(;;)//å¯ä»¥å¤æ¬¡å¯¹å符è¿è¡è½¬æ¢
{
printf("请è¾å
¥ä¸ä¸ªå符(è¾å
¥0æ¶éåº):");
scanf("%c",&c1);
if (c1=='0')return; //è¾å
¥0æ¶éåº
if(c1<='z'&&c1>='a')
printf("å
¶å¯¹åºå¤§ååæ¯ä¸º%c\n",c1-('a'-'A'));
else if(c1<='Z'&&c1>='A')
printf("å
¶å¯¹åºå°ååæ¯ä¸º%c\n",c1+('a'-'A'));
scanf("%c",&c1);//å»ææ¢è¡ç¬¦
}
}
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