2c.c

计算概论阅读材料

#include <stdio.h>
void main(void)
{
	char ch;
	scanf("%c",&ch);
	ch=(ch>='A'&&ch<='Z')?ch-'A'+'a':ch;
	printf("%c",ch);
// printf("%c\n",(ch=getchar())<='Z'&&ch>='A'?ch-'A'+'a':ch);

}