?? 3-4.c
字號:
#include <REG52.H>
#include <stdio.h>
void main (void)
{
int month;
int day;
SCON = 0x50;
TMOD |= 0x20;
TH1 = 0xf3;
TR1 = 1;
TI = 1;
printf("please input the month number :");
scanf("%d",&month ) ;
switch (month)
{
case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
case 12: day=31;
break;
case 4:
case 6:
case 9:
case 11:day=30;
break;
case 2: day=28;
break;
default : day=-1;
}
if(day==-1)
printf("Invalid month input !\n");
else
printf("1999.%d has %d days \n",month,day);
while (1) {};
}
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