在C++ 中,string 类型定义在 std 命名空间中。如果你没有使用 std::string,而是直接使用 string,你需要确保在使用 string 之前已经声明了 using namespace std;。 示例代码: cpp #include <iostream> #include <string> using namespace std; // 或者在需要使用
第二种方法:利用<string>中的getline函数,按行读取,这样每一行内的所有空格也可以顺利读取 #include<iostream> #include<fstream> #include<string> using namespace std; int main() { ifstream ifs; ifs.open("test.txt", ios::in); if (readFile.is_open()) { cout << "文件打开成功" << endl; ...
C++function does not take 0 parameters#include"iostream.h" class Student { public: void change(Student&); void display(Student&); private: int num; float score; }; int main() { void fun(); return 0; } void Student::change(Student&t) { int n; float s; cin>>n; cin>>s; num=...
error C2660: 'pen' : function does not take 1 parameters#include <iostream> #include<vector> using namespace std; vector<int>vec; int n; void pen(); void print_pen(vector<int>); int main() {cout<<"please entir number"; cin>>n; pen(n); print_pen(vector<int>vec); return 0;...
#include <iostream>classTest {public:boolyes(); };boolTest::yes() { std::cout<<"yes"<<std::endl;//return false;};intmain() { Test*t =newTest;boolr = t->yes(); std::cout<<"yes->"<< r <<std::endl;return0; }
int (*a)(int, int);a = sum;这已经是两条语句了，第一句是声明，第二句是赋值，而在函数体外只允许声明语句，但也允许声明的同时进行初始化。应改为 int (*a)(int, int) = sum;a
include <iostream> include <string> include <iomanip> using namespace std;class Book //设置图书馆藏书类，用以封存图书信息 { public:Book(string n,int N,int fl) //图书类构造函数 { name=n; //设置图书书名 number=N; //设置编号 flag=fl; //图书是否借出标志 } void display() /...
【题目】C++function does not take0parame ters#include"iostream,h" class Student{ publi c: void change(Student&); void display(Student&); private: int num; float score; }; int main() { void fun(); return 0;} void Student::cha nge(Student(t) { int n; float s;cin>>n; cin>>s...
#include <iostream> #include <string.h> using namespace std; class Menu { private: String choices[5]; String title; public: int Select(); }; int Menu::Select() { int i; int selection = 0; for (i = 0; i < 5; i++)
#include <iostream> using namespace std; int main() { int num, sum = 0; do { cout << "Enter a positive number (or enter 0 to exit): "; cin >> num; if (num > 0) { sum += num;} } while (num != 0); cout << "The sum of the positive numbers entered is: " << su...