#include <stdio.h>
#include <stdlib.h>

int main()
{

int dia , mes ,ano;
int ultimo_dia[]= {-1,31,28,31,30,31,30,31,31,30,31,30,31};
for (;;){
printf("digite o dia--->");
scanf ("%d",&dia);
printf("digite o mes--->");
scanf("%d",&mes);
printf ("digite o ano--->");
scanf("%d",&ano);
if(dia<=0 ||mes<0||mes>12||ano<=0)
{
printf("data invalida\n");
continue;
}
if (ano%4==0&& (ano%400==0 ||ano%100!=0))
ultimo_dia[2]= 29;
else
ultimo_dia[2]= 28;
if(dia >ultimo_dia[mes])
{
printf("data invalida\n");
continue;
}
if (ano%4==0 && (ano%400==0||ano%100!=0))
{
printf("ano bissexto\n\n");
}
printf("%d/%d/%d\n",dia,mes,ano);

break;
}
return 0;
}