标签：bubuko protect code ice float while 修改 显示 oid
1 #include<iostream> 2 #include<vector> 3 #include<string> 4 using namespace std; 5 string myfavorite[7]={"book", "music", "film", "paintings","anime","sport","sportsman"};//函数声明 6 void output1(vector<string> &); 7 void output2(vector<string> &); 8 void swapl(string s1,string s2); 9 int main() 10 { 11 vector<string> likes, dislikes; // 创建vector<string>对象likes和dislikes 12 likes.push_back("《高等数学》"); 13 likes.push_back("navada"); 14 likes.push_back("《复仇者联盟》"); 15 likes.push_back("向日葵"); 16 likes.push_back("《哆啦A梦》"); 17 likes.push_back("羽毛球"); 18 likes.push_back("梅西"); 19 cout << "-----I like these-----" << endl; 20 output1(likes);//调用函数输出vector数组对象like的元素值 21 dislikes.push_back("语文"); 22 dislikes.push_back("低沉音乐"); 23 dislikes.push_back("烂片"); 24 dislikes.push_back("无"); 25 dislikes.push_back("大胃王"); 26 dislikes.push_back("冰球"); 27 dislikes.push_back("无"); 28 cout << "-----I dislike these-----" << endl; 29 output2(dislikes);//调用函数输出vector数组对象dislike的元素值 30 for(unsigned int i=0;i<likes.size();i++) 31 { 32 swapl(likes[i],dislikes[i]); 33 } 34 cout << "-----I like these-----" << endl; 35 output1(likes); 36 cout << "-----I dislike these-----" << endl; 37 output2(dislikes); 38 return 0; 39 40 } 41 //以下标的方式输出 42 void output1(vector<string> &v) 43 { 44 for(unsigned int i=0;i<v.size();i++) 45 { 46 cout<<myfavorite[i]<<":"<<v[i]<<" "<<endl; 47 } 48 } 49 //以迭代器的方式输出 50 void output2(vector<string> &v) 51 { 52 int a=0; 53 for(auto i=v.begin();i<v.end();i++) 54 { 55 cout<<myfavorite[a++]<<":"<<*i<<" "<<endl; 56 } 57 } 58 void swapl(string s1,string s2){ 59 string temp=s1; 60 s1=s2; 61 s2=temp; 62 }
1 #include<iostream> 2 using namespace std; 3 int fn1(){ 4 int *p=new int(5); 5 6 return *p; 7 delete p;//在定义了new后没有使用delete进行释放内存，回导致问题的出现 8 } 9 int main(){ 10 int a=fn1(); 11 cout<<"the value of a is:"<<a; 12 return 0; 13 14 }
1 #include<iostream> 2 using namespace std; 3 int main() 4 { 5 int *p; 6 int a； 7 p=&a； 8 p=8 9 cout<<"The value at p: "<<*p; 10 return 0; 11 }
main
#include <iostream>
#include"Matrix.h"
using namespace std;
int main()
{
Matrix A(2);
Matrix B(2,3);
float a[4]={1,2,3,4};
A.setMatrix(a);
A.printMatrix();
return 0;
}
Matrix.h
#ifndef MATRIX_H_INCLUDED
#define MATRIX_H_INCLUDED
class Matrix{
public:
Matrix(int n);//构造函数，构造n*n矩阵
Matrix(int n,int m);//n*m矩阵
Matrix(const Matrix &x);//复制构造函数，使用已有矩阵x构造
~Matrix;
void setMatrix(const float *pvalue);//矩阵赋初值，用pvalue指向的内存块数据为矩阵赋初值
void printMatrix()const;//显示举证
inline float &element(int i,int j);//返回矩阵第i行第j列元素的引用
inline float element(int i,int j)const;//返回矩阵i行j列元素
void setElement(int i,int j,int value);//设置矩阵第i行第j列的元素为value
inline int getLines()const;//返回矩阵行数
{
return lines;
}
inline int getCols()const;//返回矩阵列数
{
return cols;
}
private:
int lines;
int cols;
float *p;//存放矩阵数据内存的首地址
};
inline float &element(int i,int j)
{
float &r=p[(i-1)*cols+j-1];
return r;
}
inline float element(int i, int j) const
{
float r=p[(i-1)*cols+j-1];
return r;
}
#endif // MATRIX_H_INCLUDED
Matrix.cpp
#include<iostream>
#include"Matrix.h"
using namespace std;
Matrix::Matrix(int n):lines(n),cols(n)
{
p=new float[lines*cols];
}
Matrix::Matrix(int n,int m):lines(n),cols(m)
{
p=new float[lines*cols];
}
Matrix::~Matrix()
{
delete p;
}
void Matrix::printMatrix()const
{
for(int i=0;i<lines;i++)
{
for(int j=0;j<cols;j++)
cout<<p[i*cols+j]<<" ";
cout<<endl;
}
}
void Matrix::setMatrix(const float *pvalue)
{
for(int i=0;i<lines;i++)
{
for(int j=0;j<cols;j++)
p[i*cols+j]=pvalue[i*cols+j];
}
}
期中考试
#include <iostream>
#include<cstdlib>
#include<cmath>
#include<ctime>
using namespace std;
class Dice
{
public:
Dice(int n);
int cast();
protected:
int sides;
};
Dice::Dice(int n):sides(n){}
Dice::cast()
{
struct timeb timeSeed;
ftime(&timeSeed);
srand(timeSeed.time * 1000 + timeSeed.millitm);
int result;
result=1+(rand()%sides-1);
return result;
}
int main()
{
double times,probability;
Dice a(40);
for(int i=0;i<500;i++){
int eachtime=a.cast();
cout<<eachtime<<" ";
if(eachtime==21)
times++;
}
probability=times/500;
cout<<"概率是"<< probability<<endl;
return 0;
}
main
#include <iostream>
#include"user.h"
#include <string>
#include <vector>
using namespace std;
int main()
{
vector<user>users;
int count = 0;
while (true) {
cout << "创建用户输1，修改新用户密码输2，打印用户信息输3，打印当前ID输4，退出输0" << endl;
int number;
cin >> number;
if (number == 1) {
user u1;
users.push_back(u1);
count++;
}
else if (number == 2) {
users[count - 1].changepassword();
}
else if (number == 3) {
users[count - 1].print();
}
else if (number == 4) {
users[count - 1].printcurrentid();
users[count - 1].print();
}
else if (number == 0) {
break;
}
}
return 0;
}
user。h
#ifndef USER_H_INCLUDED
#define USER_H_INCLUDED
#include <string>
#include <vector>
#include <iostream>
using namespace std;
class user
{
public:
user();
~user();
void print();
void changepassword();
void printcurrentid();
private:
int id;
string name;
string password;
static int currentid;
};
#endif // USER_H_INCLUDED
user。cpp
#include<iostream> #include"user.h" #include <string> #include <vector> #include <iostream> using namespace std; int user::currentid = 999; user::user() { cout << "请输入用户名："; cin >> name; password = "111111"; currentid++; id = currentid; } user::~user(){} void user::print() { cout << "用户ID为：" << id << endl; cout << "用户名为：" << name << endl; cout << "密码为：" << password << endl; } void user::changepassword(){ int count=0; while(count<3) { string a; cout<<"plesse input psssword"<<endl; cin>>a; if(a==password) {cout<<right; cin>>a; password=a; break; } else cout<<"错了请重输"<<endl; count++; } if (count == 3) { cout << "请稍后再试" << endl; } } void user::printcurrentid(){ cout << "currentID:" << currentid << endl; }
main
#include <iostream>
#include<vector>
#include"Book.h"
using namespace std;
int main()
{
vector<Book> books;
string cx,cv;
float pl;
while(cin>>cx>>cv>>pl)
{
Book a(cx,cv,pl);
books.push_back(a);
}
for(int i=0;i<books.size();i++)
{
books[i].print();
}
return 0;
}
book.h
#ifndef BOOK_H_INCLUDED
#define BOOK_H_INCLUDED
#include<iostream>
#include<string>
#include<cstring>
using namespace std;
class Book
{
public:
Book(string a,string c,float v);
void print();
private:
string isbn;
string title;
double price;
};
#endif // BOOK_H_INCLUDED
book.cpp
#include "Book.h"
Book::Book(string a,string b,float c):isbn(a),title(b),price(c){}
void Book::print()
{
cout<<"出版编号："<<isbn<<" "<<"书名："<<title<<" "<<"定价："<<price<<" RMB"<<endl;
}
标签：bubuko protect code ice float while 修改 显示 oid
原文地址：https://www.cnblogs.com/fffffaaaaaa/p/9080006.html
