函数不返回输入到数组中的最大值和最小值

Millet123 发表于 Dev

小米123

此函数不能正确返回输入到数组中的最高和最低值。我不确定我为此程序输入的代码。该程序需要返回输入到数组中的所有元素的平均值（平均值部分工作正常），并找到输入到数组中的所有值中的最高和最低值。请帮忙！

#include <iostream>
using namespace std;
float temptotal = 0;
float averagetemp = 0;
float temperatures[50];
float average(int);
void highest(int);
void lowest(int);
int main()
{
int days = 0;
cout << "Enter the number of days: ";
cin >> days;
if (days > 50)
{
    cout << "You may only enter temperatures for 50 days." << endl;
    return 0;
}
average(days);
highest(days);
lowest(days);
}
float average(int days)
{
    for (int i = 1; i <= days; i++)
    {
        cout << "Enter the temperature for day number " << i << ": ";
        cin >> temperatures[i];
        temptotal += temperatures[i];
    }
        averagetemp = temptotal / days;
        cout << "The average temperature is: " << averagetemp << endl;
        return averagetemp;
}
void highest(int days)
{
    int count;
    int highest;
    highest = temperatures[50];
    for (count = 1; count < days; count++)
    {
        if (temperatures[count] > highest)
            highest = temperatures[count];
        cout << "The highest temperature is: " << highest << endl;
    }
}
void lowest(int days)
{
    int count;
    int lowest;
    lowest = temperatures[50];
    for (count = 1; count < days; count++)
    {
        if (temperatures[count] < lowest)
            lowest = temperatures[count];
        cout << "The lowest temperature is: " << lowest << endl;
    }
}

来自莫斯科的弗拉德

该功能

float average(int days)
{
    for (int i = 1; i <= days; i++)
    {
        cout << "Enter the temperature for day number " << i << ": ";
        cin >> temperatures[i];
        temptotal += temperatures[i];
//...

已经错误，因为元素temperatures[0]不会被初始化。你必须写

float average(int days)
{
    for (int i = 1; i <= days; i++)
    {
        cout << "Enter the temperature for day number " << i << ": ";
        cin >> temperatures[i-1];
        temptotal += temperatures[i-1];
//...

或者

float average(int days)
{
    for (int i = 0; i < days; i++)
    {
        cout << "Enter the temperature for day number " << i + 1 << ": ";
        cin >> temperatures[i];
        temptotal += temperatures[i];
//...

功能highest和lowest也是错误的。例如，数组temperatures没有索引为50的元素。此外，用户可以输入少于50天的天数。因此，此语句

highest = temperatures[50];

是错的。

可以像该函数定义那样编写函数

void highest( int days )
{
    int highest = temperatures[0];

    for ( int count = 1; count < days; count++ )
    {
        if ( highest < temperatures[count] ) highest = temperatures[count];
    }

    cout << "The highest temperature is: " << highest << endl;
}

考虑到acccount有标准算法std::max_element，std::min_element，std::minmax_element在头部声明<algorithm>可以使用，而不是你的功能。

例如，可以通过std::max_element以下方式使用标准算法定义最高功能

#include <algorithm>

//...

void highest( int days )
{

    cout << "The highest temperature is: " 
         << *std::max_element( temperatures, temperatures + days )
         << endl;
}

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