73课 求1到100的所有奇数之和，个数，平均值

 1 #include <stdio.h>
 2 
 3 int main (void)
 4 {
 5     int i;
 6     int sum = 0;
 7     int cnt = 0;
 8     float avg;//average平均值的缩写
 9 
10     for (i = 1; i<101; ++i)
11     {
12         if (i%2 == 1)
13         {
14             sum += i;
15             ++cnt;
16         }
17     }
18     avg = 1.0*sum /cnt; //1.0默认的是double类型
19 
20     printf("sum = %d\n",sum);
21     printf("cnt = %d\n",cnt);
22     printf("avg = %f\n",avg);
23 
24     
25     return 0;
26 }