int ch ; OS-sk!
ch=getche() ; *U;'OWE[
if((ch>='a') && (ch<='z')) T*?s@$)m4
printf("%c is a lowercase letter\n" ,ch); a5@z:i
else if ((ch>='A') && (ch<='Z')) !Uh2}ic
print(" %c is a uppercase letter\n" ,ch); "13"`!m
else if((ch>'0')&&(ch<'9') {:Aw_z:'
printf(" %c is a number character between 0 and 9\n" ,ch) ; L*h{'<Bz
else ~*M$O &
printf("%c is...") )KE[!ofD
fH\X
外面再加个循环就行了