수거~~~~
  #include <stdio.h>
  char M<>={"It is very important for you to study C programming"};
 char ASC(int ASC_CODE);
 main()
{
	int cnt;
	char cmp;
 	for(cnt=0;cnt<=50;cnt++)
		{
		cmp=ASC(M[cnt]);
		if(cmp>=65 && cmp<=90)
		{
		printf("%c",cmp+32);
		}
 		else
		{printf("%c",cmp-32);
		}
  		}
}
 char ASC(int ASC_CODE)
{
	return ASC_CODE;
}