Question

所以我有一些代码，我正在为一个作业写作，我仍然坚持从3个浮点数中找到最小值和最大值。我目前收到错误

/ usr / include / c ++ / 4.9 / bits / predefined_ops.h：121：39：错误：一元＆＃39; ＆＃39;的无效类型参数（有＆＃39;浮动＆＃39;） {return bool（_M_comp（ __ it1，* __ it2））; }

这是我目前的代码：

#include <iostream>
#include <string>
#include <algorithm>

using namespace std;

//Name: Tanner Langan
//Student Number: 300224340
//Date: 2//16/2017
//Assignment 3


int main()
{
char c1;
float x1,x2,x3;

cout << "Please Enter 1 character and 3 float numbers. One at a time" << endl;
cout << "You must choose either X, N, V, or S for the character." << endl;
cout << "If you choose X the result displayed will be the the maximum of x1, x2, and x3" << endl;
cout << "If you choose N the result displayed will be the the minimum of x1, x2, and x3" << endl;
cout << "If you choose V the result displayed will be the the average of x1, x2, and x3" << endl;
cout << "If you choose S the program will terminate.";
cin >> c1;
cin >> x1;
cin >> x2;
cin >> x3;

while (c1 != 'S')
{
if(c1 == 'X' || c1 == 'x')
{
cout << "The max is" << std::max_element(x1,x2,x3) << endl;
main();
}
if(c1 == 'N' || c1 == 'n')
{

cout << "The min is" << std::min_element(x1,x2,x3) << endl;
main();
}
if(c1 == 'V' || c1 == 'v')
{
cout << "The average is" << (x1+x2+x3)/3 << endl;
main();
}

}
return 0;

 }

Answer 1

std::max_element和std::min_element并没有按照您的想法工作。它们实际上将迭代器带到序列和比较器，而不仅仅是数字。它们还返回迭代器，而不是值，因此在尝试随机调用函数之前，请阅读文档并了解如何使用它们。我链接的页面上有一些示例可以帮助您。

最小值和最大值c ++

1 个答案: