【杭电acm】1018 Big Number

 1 #include <stdio.h>
 2 #include <math.h>
 3 
 4 int main() {
 5     int case_n, n;
 6     int i;
 7     double sum;
 8 
 9     scanf("%d", &case_n);
10 
11     while (case_n--) {
12         scanf("%d", &n);
13         sum = 1.0f;
14         for (i=1; i<=n; ++i)
15             sum += log10(i);
16         printf("%d\n", (int)sum);
17     }
18 
19     return 0;
20 }