大家看看哪里出了问题，最后显示是0

问题：实现从N个物品种找出价值总和最大的物品，放在额定容量的背包里。

#include <stdio.h>
#define N 100
int num_type;
int currentoption[N];
int option[N];
double maxvalue;/*最大值*/
double totalvalue;/*总价值*/
double limitweight;/*重量限制*/
struct 
{
    double weight;
    double value;
}good[N];
void outchick(int i, double tw, double totalvalue)
{
    int k;
    if (tw + good[i].weight <= limitweight)
    {
        currentoption[i] = 1;
        if (i < num_type - 1)
            outchick(i + 1, tw + good[i].weight, totalvalue);
        else
        {
            for (k = 0; k < num_type; ++k)
                option[k] = currentoption[k];
            maxvalue = totalvalue;
            
        }
    }
    currentoption[i] = 0;
    if (totalvalue - good[i].value > maxvalue)
    {
        if (i < num_type - 1)
            outchick(i + 1, tw, totalvalue - good[i].value);
        else
        {
            for (k = 0; k < num_type; ++k)
                option[k] = currentoption[k];
            maxvalue = totalvalue - good[i].value;
        }
    }
}
void main()
{
    int i;
    double weight, value;
    printf("请输入物品的类别数：\n");
    scanf_s("%d", &num_type);
    printf("请输入物品的重量和价格\n");
    totalvalue = 0.0;
    for (i = 0; i < num_type; ++i)
    {
        scanf_s("%lf %lf", &weight, &value);
        good[i].weight = weight;
        good[i].value = value;
        totalvalue += value;
    }
    printf("输入重量限制\n");
    scanf_s("%lf", &limitweight);
    limitweight = 0.0;
    for (i = 0; i < num_type;++i)
    {
        currentoption[i] = 0;
    }
    outchick(0, 0.0, totalvalue);
    for (i = 0; i < num_type;++i)
        if (option[i])
            printf("%d\t", i + 1);
    printf("总价值是%2f", maxvalue);
}

scanf_s("%lf", &limitweight);
limitweight = 0.0;

你这里刚输入重量限制，又把它清掉干什么？