# include <stdio.h>
# include <math.h>

int main ()
{
    int i, j, n, m;
    int sum = 0;

    printf("请输入任意值，求1到任意值之间的奇数之和:\n");
    scanf("%d",&j);

    for(i=1; i<=j; i=i+2)   
    {
        sum = sum + i;      
    }
    printf("奇数之和sum=%d\n",sum);

    n = sqrt(sum);              //n个奇数之和sum=n*n
    printf("奇数个数n=%d\n",n);

    m = sum/n;
    printf("奇数之和平均值m=%d\n",m);

    return 0;
}

#include<stdio.h>
int main()
{
    int n,x,z=0,y=0;
    scanf("%d",&n);
    for(x=1;x<=n;x=x+2)
    {
        y=y+x;
    }
    printf("1到%d之间的奇数和为%d\n",n,y);
    for(x=1;x<=n;x=x+2)
    {
       z=z+1;   
    }
    printf("1到%d之间的奇数个数为%d\n",n,z);
    return 0;  
}

奇数数量 = (j+1)/2
奇数和 = 奇数数量 * 奇数数量
平均值 = 奇数数量