这个程序为什么会报错说i的定义不明确？

#include<stdio.h>
int main()
{
int year,month,day,x,t;
t=0;
printf("请输入日期(年,月,日):");
scanf("%d,%d,%d",&year,&month,&day);
if(year%4==0){int i[12]={31,29,31,30,31,30,31,31,30,31,30,31};}
else{int i[12]={31,28,31,30,31,30,31,31,30,31,30,31};}
for(x=0;x<month-1;x++){
t+=i[x];}
t=t+day;
printf("%d,%d",i,t);
}