C++ 常用操作

String int 互相转换

//C
std::string str;
int i = atoi(str.c_str());
//C++
std::string str;
int i = std::stoi(str);
//同样, 可以使用 stol(long), stof(float), stod(double) 等.
string temp = to_string (int val)

STL

Stack

#include<iostream>  
#include<stack>  
using namespace std;  
int main(void)  
{  
    stack<double>s;//定义一个栈  
    for(int i=0;i<10;i++)  
        s.push(i);  
    while(!s.empty())  
    {  
        printf("%lf\n",s.top());  
        s.pop();  
    }  
    cout<<"栈内的元素的个数为："<<s.size()<<endl;  
    return 0;  
}

Queue

#include<iostream>  
#include<queue>  
#include<stdlib.h>  
using namespace std;  
class T  
{  
    public:  
    int x,y,z;  
    T(int a,int b,int c):x(a),y(b),z(c)  
    {  
    }  
};  
bool operator<(const T&t1,const T&t2)  
{  
    return t1.z<t2.z;  
}  
int main(void)  
{  
    priority_queue<T>q;  
    q.push(T(4,4,3));  
    q.push(T(2,2,5));  
    q.push(T(1,5,4));  
    q.push(T(3,3,6));  
    while(!q.empty())  
    {  
        T t=q.top();  
        q.pop();  
        cout<<t.x<<" "<<t.y<<" "<<t.z<<endl;  
    }  
    system("Pause");  
    return 1;  
}