程序代码：

# include <stdio.h>

void main()
{
    int  sum1, sum;
    sum = 0;
    sum1 = 0;
    for (int i=1; i<=100; i++)
    {
        if (i%2 != 0)
        {
            sum = sum + i;
            sum1++;
        }
    }

    printf("平均值为：%f\n", (float)sum/sum1);


}