《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。。。