case conversion

#include<stdio.h>
#include<stdlib.h>
intmain()
{
int ch=0;
	while((ch=getchar())!=EOF)
	{
	if(ch>='A' && ch<='Z')
	{
		printf("%c\n",ch+32);
	}
	else if(ch>='a' && ch<='z')
	{printf("%c",ch-32);}
	else if(ch>='0'&& ch<='9')
		;
	else
	{	
	putchar(ch);
	}
	}
	system("pause");
	return 0;
}



operation result