C++底子：变量的正当性和三数字比较
变量的正当性#include<iostream>
#include<string>
#include<vector>
#include<algorithm>
#include<cmath>
using namespace std;
int main()
{
int This_little_pig;
int latest thing;
int the_!_no;
int the_@_no;
int the_#_no;
int the_$12_method;
int the_%12;
int the_^_no;
int the_&_no;
int the_*_no;
int the_(_no;
int the_+_no;
int the_<_no;
int number;
int string;
double _this_is_ok;
double correct?;
}
https://i-blog.csdnimg.cn/direct/4fd3a664c2ab4dbb86ae690cd2e83b1c.png
特殊符号中这个美元符号$是可以作为变量的，标准库中的string也可以，但不发起利用
其中我写的一个转换函数，因为它功能上没有任何题目，但是没有返回值，结果报了一个错误，让我修改，果然C++很严谨，记录以下这个错误。
int swap(int &a, int &b){
int temp = a;
a = b;
b = temp;
}
https://i-blog.csdnimg.cn/direct/5533ee0a9b5043e68e55d85d408bf673.png
标题：
编写一个程序，提示用户输入三个整数值，然后按照数值巨细次序用到逗号隔开的方式输出这些值。因此，用户输入10 4 6 时输出值为4,6,10.假如有两个值相同，那么他们按序一起输出。因此，输入4 4 5将会输出4,4,5。
#include "std_lib_facilities.h"
void swap(int &a, int &b){
int temp = a;
a = b;
b = temp;
}
void compare(int first, int second, int third){
if (first < second){
if (first < third){
if (second < third) {
cout << first << ","<< second << "," << third << "\n";
}else{
swap(second,third);
cout << first << ","<< second << "," << third << "\n";
}
}else{
swap(first,third);
if (second < third) {
cout << first << ","<< second << "," << third << "\n";
}else{
swap(second,third);
cout << first << ","<< second << "," << third << "\n";
}
}
}else{
swap(first,second);
if (first < third){
if (second < third) {
cout << first << ","<< second << "," << third << "\n";
}else{
swap(second,third);
cout << first << ","<< second << "," << third << "\n";
}
}
}
}
int main()
{
cout << "Please enter three integer number:\n";
int first_num, second_num, third_num;
cin >> first_num >> second_num >> third_num;
compare(first_num,second_num,third_num);
}
两个值交换
//方法1：
void swap(int &a, int &b) {
int temp = a;
a = b;
b = temp;
}
swap(a,b);//函数调用
//方法2：
void swap(int &a, int &b) {
a = a + b;
b = a - b;
a = a - b;
}
swap(a,b);//函数调用
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