《算法竞赛入门经典》第二章 2.3

程序2-7

　　略去

程序2-8

 1 #define LOCAL
 2 #include<stdio.h>
 3 #define INF 100000000
 4 int main()
 5 {
 6     #ifdef LOCAL
 7     freopen("data.in","r",stdin);
 8     freopen("data.out","w",stdout);
 9     #endif // LOCAL
10     int x, n = 0, min = INF, max = -INF, s = 0;
11     while(scanf("%d", &x) == 1)
12     {
13         s +=x;
14         if(x < min) min = x;
15         if(x > max) max = x;
16         /*
17         printf("x = %d, min = %d, max = %d\n ",x, min, max);
18         */
19         n++;
20     }
21     printf("%d %d %0.3lf",min, max, (double)s/n);
22     return 0;
23 }

习题 2-9

 1 #include<stdio.h>
 2 #define INF 100000000
 3 int main()
 4 {
 5     FILE *fin, *fout;
 6     fin = fopen("data.in","rb");
 7     fout = fopen("data.out","wb");
 8     int x, n = 0, min = INF, max = -INF, s = 0;
 9     while(fscanf(fin,"%d", &x) == 1)
10     {
11         s +=x;
12         if(x < min) min = x;
13         if(x > max) max = x;
14         n++;
15     }
16     fprintf(fout,"%d %d %0.3lf",min, max, (double)s/n);
17     fclose(fin);
18     fclose(fout);
19     return 0;
20 }

习题2-8,2-9文件操作，也是最近做论文才熟悉一些的。。。