#include <stdio.h>
#include <math.h>
int main (void)
{
    int n;
    double sum_odd=0.0,sum_even=0;
    double ct_odd=0,ct_even=0;
    while (scanf("%d",&n)==1 && n!=0)
    {
        if (n % 2 == 1)
        {    sum_odd += n;
            ++ct_odd;
        }
        else
            
        {    sum_even += n;
                ++ct_even;
        }
    }   
        printf ("Number of evens: %d",sum_even);
        if (ct_even > 0) printf (" average : %Lf",sum_even/ct_even);
        printf ("\n");
        printf ("Nunber of odd : %d",sum_odd);
            if (ct_odd > 0) printf (" average : %Lf",sum_odd/ct_odd);
        printf("\n");
}

为什么"Number of evens 和odd都是0呢


[ 本帖最后由 yuanye2416 于 2012-10-25 15:12 编辑 ]

#include <stdio.h>
#include <math.h>
int main (void)
{
    int n;
    double sum_odd=0.0,sum_even=0;
    double ct_odd=0,ct_even=0;
    while (scanf("%d",&n)==1 && n!=0)
    {
        if (n % 2 == 1)
        {    sum_odd += n;
            ++ct_odd;
        }
        else
           
        {    sum_even += n;
                ++ct_even;
        }
    }   
        printf ("Number of evens: %d",sum_even);//你把%d换成%lf，因为你定义的是double型，相输出整数可以强制转换，printf ("Number of evens: %d",(int)sum_even);
        if (ct_even > 0) printf (" average : %Lf",sum_even/ct_even);
        printf ("\n");
        printf ("Nunber of odd : %d",sum_odd););//你把%d换成%lf
        if (ct_odd > 0) printf (" average : %Lf",sum_odd/ct_odd);
        printf("\n");
}

#include <stdio.h>
#include <math.h>
int main (void)
{
    int n;
    double sum_odd=0.0,sum_even=0;
    double ct_odd=0,ct_even=0;
    while (scanf("%d",&n)==1 && n!=0)
    {
        if (n % 2 == 1)
        {    sum_odd += n;
            ++ct_odd;
        }
        else
           
        {    sum_even += n;
                ++ct_even;
        }
    }   
        printf ("Number of evens: %d",sum_even);//你把%d换成%lf，因为你定义的是double型，相输出整数可以强制转换，printf ("Number of evens: %d",(int)sum_even);
        if (ct_even > 0) printf (" average : %Lf",sum_even/ct_even);
        printf ("\n");
        printf ("Nunber of odd : %d",sum_odd););//你把%d换成%lf
        if (ct_odd > 0) printf (" average : %Lf",sum_odd/ct_odd);
        printf("\n");
}

输出错了，你改下就好了。