習題3-6

#include<stdio.h>
#include<ctype.h>
char up(char ch)
{
if(ch>='a'&&ch<='z')
{
ch=toupper(ch);
printf("%c\n",ch);
return ch;
}
else
{
	printf("%c\n",ch);
}
}
int main()
{
	char zifu;
	char jx;
	do
	{
printf("請輸入一個字母（大小寫均可）：");
scanf("%c",&zifu);
 up(zifu);
 printf("Are you continue?[y/n]\n");
 jx=getchar();
	}while((jx=getchar())=='y');
return 0;

}