比较整数 C++
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Comparing Integers C++
提问by TAM
Hey So I am learning basic c++ just started this week, I have a question that says:
嘿所以我这周刚开始学习基本的c++，我有一个问题说：
Write a program to compare 3 integers and print the largest, the program should ONLY Use 2 IF statements.
编写一个程序来比较 3 个整数并打印最大的一个，该程序应该只使用 2 个 IF 语句。
I am not sure how to do this so any help would be appreciated
我不知道如何做到这一点，所以任何帮助将不胜感激
So far I have this:
到目前为止，我有这个：
#include <iostream>
using namespace std;
void main()
{
int a, b, c;
cout << "Please enter three integers: ";
cin >> a >> b >> c;
if ( a > b && a > c)
cout << a;
else if ( b > c && b > a)
cout << b;
else if (c > a && c > b)
cout << b;
system("PAUSE");
}
回答by billz
int main()
{
int a, b, c;
cout << "Please enter three integers: ";
cin >> a >> b >> c;
int big_int = a;
if (a < b)
{
big_int = b;
}
if (big_int < c)
{
big_int = c;
}
return 0;
}
Also note, you should write int main()instead of void main().
另请注意，您应该编写int main()而不是void main().
回答by legends2k
#include <iostream>
int main()
{
int a, b, c;
std::cout << "Please enter three integers: ";
std::cin >> a >> b >> c;
int max = a;
if (max < b)
max = b;
if (max < c)
max = c;
std::cout << max;
}
Although the above code satisfies the exercise question, I thought I'll add a couple of other ways to show ways of doing it without any ifs.
虽然上面的代码满足了练习题，但我想我会添加一些其他的方法来展示没有任何ifs 的方法。
Doing it in a more cryptic, unreadable way, which is discouraged, would be
以一种更神秘、更不可读的方式来做，这是不鼓励的，将是
int max = (a < b) ? ((b < c)? c : b) : ((a < c)? c : a);
An elegant way would be to #include <algorithm>and
一种优雅的方式将#include <algorithm>和
int max = std::max(std::max(a, b), c);
With C++11, you can even do
使用 C++11，你甚至可以做到
const int max = std::max({a, b, c});
回答by Ivan Kuckir
You don't need the last "else if" statement. In this part of code it is sure that "c" is maximal - no number is larger.
您不需要最后一个“else if”语句。在这部分代码中，可以确定“c”是最大的——没有更大的数字。
回答by Anton Kovalenko
Hint: one of your ifstatements is useless (actually, it introduces a bug because nothing will be printed if a, b and c are all equal).
提示：你的一个if语句是无用的（实际上，它引入了一个错误，因为如果 a、b 和 c 都相等，则不会打印任何内容）。
