C ++中的“声明没有存储类或类型说明符”

Question

I'm learning C++ through the book (5th Edition),today I encounter a problem when doing the exercise 12.6.

The code is shown below, the error is this declaration has no storage class or type specifier . But the program can run normally. The error locates at the last line on '}'.

#include<iostream>
#include<vector>
#include<new>

using namespace std;

vector<int>* func(){
    return new vector<int>();
}

void read_vec(istream &in, vector<int>* vp){
    int i;
    while(in>>i)
        vp->push_back(i);
}

void print_vec(vector<int>* vp){
    for(int i:*vp)
        cout<<i<<" ";
    cout<<endl;
}

int main(){
    auto vec = func();
    cout<<"Enter a sequence of integers"<<endl;
    read_vec(cin,vec);
    print_vec(vec);
    delete vec;
    vec = nullptr;

    system("pause");
}

I have searched the message, but still cannot figure out where my code is wrong.

I would be appreciative for all hints.

Answer 1

You need the standard library header <cstdlib> to use system .

Add

#include <cstdlib>

at the top of the file. Then, use std::system instead of just system .

std::system("pause");