case语句中能写scanf（）函数吗？

#include <stdio.h>
void main(){
char day,ch;
printf("input day: ");
scanf("%c",&day);
switch (day){
case 'M':printf("Monday!\n");break;
case 'F':printf("Friday!\n");break;
case 'W':printf("Wednesday!\n");break;
case 'T':printf("input second char:\n");
scanf("%c",&ch);
if(ch=='h')
printf("Thursday!\n");
else if(ch=='u')
printf("Tuesday!\n");
else
printf("error!\n");
break;
case 'S':printf("input second char:\n");
scanf("%c",&ch);
if(ch=='a')
printf("Sataday!\n");
else if(ch=='u')
printf("Sunday!\n");
else

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