HDU 1018 Big Number

#include <stdio.h>
#include <math.h>

int main()
{
//freopen("input.txt","r",stdin);
int n,i,cases;
double sum;
while(scanf("%d",&cases)!=EOF)
{
while(cases)
{
cases--;
sum=1;
scanf("%d",&n);
for(i=1;i<=n;i++)
{
sum+=log10(i);  //循环把精确位数加起来
}
printf("%d/n",(int)sum);
}
}

return 0;
}