[已解决]c++模板问题

woshijunjun

请问，为什么这个函数运行结果是这个啊？

#include<iostream>
using namespace std;
template <typename T>
T average(T*array, int n = 0)
{
        T sum = 0;
        T aver = 0;
        for (int i = 0; i <= n; i++)
        {
                sum += array[i];
        }
        aver = sum / n;
        return aver;
};

int main()
{
        int iarray[] = { 1,2,3,4,5,6,7,8,9 };
        double darray[] = { 1.1,2.2,3.3,4.4,5.5,6.6,7.7,8.8,9.9 };
        int int_iarray = average(iarray, 9);
        double double_darray = average(darray, 9);
        cout <<  int_iarray<< endl;
        cout << double_darray<< endl;
        return 0;
}

最佳答案

月排行榜 / 总排行榜

qiuyouzhi

2021-6-20 11:01:52

改成这样试试：

#include<iostream>
using namespace std;
template <typename T>
T average(T*array, int n = 0)
{
    T sum = 0;
    T aver = 0;
    for (int i = 0; i <= n; i++)
    {
        sum += array[i];
    }
    aver = sum / n;
    return aver;
};

int main()
{
    int iarray[] = { 1,2,3,4,5,6,7,8,9 };
    double darray[] = { 1.1,2.2,3.3,4.4,5.5,6.6,7.7,8.8,9.9 };
    int int_iarray = average<int>(iarray, 9);
    double double_darray = average<double>(darray, 9);
    cout <<  int_iarray<< endl;
    cout << double_darray<< endl;
    return 0;
}

跳转到最佳答案楼层

人造人

不是代码的问题吧
$ g++ -g -Wall -o main main.cpp
$ ./main
5
5.5
$

qiuyouzhi

改成这样试试：

#include<iostream>
using namespace std;
template <typename T>
T average(T*array, int n = 0)
{
    T sum = 0;
    T aver = 0;
    for (int i = 0; i <= n; i++)
    {
        sum += array[i];
    }
    aver = sum / n;
    return aver;
};

int main()
{
    int iarray[] = { 1,2,3,4,5,6,7,8,9 };
    double darray[] = { 1.1,2.2,3.3,4.4,5.5,6.6,7.7,8.8,9.9 };
    int int_iarray = average<int>(iarray, 9);
    double double_darray = average<double>(darray, 9);
    cout <<  int_iarray<< endl;
    cout << double_darray<< endl;
    return 0;
}