cin sometimes compiling and never working.

Question

I'm trying to figure out how to use vs code, but stupid thing is mad at me.

When I put in this code:

#include <iostream>

using namespace std;

int main()
{
    cout << "Hello world!";
    int x;
    cin >> x;
    cout << x;
}
```Nothing happens, it doesn't even get to printing hello world.

When I try this though:


```cpp
#include <iostream>
#include <vector>
#include <string>

using namespace std;

int main()
{
    vector<string> msg {"Hello", "C++", "World", "from", "VS Code", "and the C++ extension!"};

    for (const string& word : msg)
    {
        cout << word << " ";
    }
    cout << endl;
}

then it prints the first message, but isn't receiving any data.

What am I doing wrong in vs code (technically Visual Studio Code) and how can I fix it?

Answer 1

Hi, @The Codeler •

Make sure you flush the stream.

Add std::endl

std::cout << "Hello world!" << std::endl;

or use

std::cout << "Hello world!";
std::cout.flush();

Also check that the running program is up to date.

Try to use external console: "console": "externalTerminal",

.vscode

├──launch.json

{
    "configurations": [
        {
            "name": "C/C++: cl.exe build and debug active file",
            "type": "cppvsdbg",
            "request": "launch",
            "program": "${fileDirname}\\${fileBasenameNoExtension}.exe",
            "args": [],
            "stopAtEntry": false,
            "cwd": "${fileDirname}",
            "environment": [],
            "console": "externalTerminal",
            "preLaunchTask": "C/C++: cl.exe build active file"
        }
    ],
    "version": "2.0.0"
}

├──tasks.json

{
    "tasks": [
        {
            "type": "cppbuild",
            "label": "C/C++: cl.exe build active file",
            "command": "cl.exe",
            "args": [
                "/Zi",
                "/EHsc",
                "/nologo",
                "/Fe${fileDirname}\\${fileBasenameNoExtension}.exe",
                "${file}"
            ],
            "options": {
                "cwd": "${fileDirname}"
            },
            "problemMatcher": [
                "$msCompile"
            ],
            "group": {
                "kind": "build",
                "isDefault": true
            },
            "detail": "Task generated by Debugger."
        }
    ],
    "version": "2.0.0"
}

In addition, the original code works well in Visual Studio.

Best regards,

Minxin Yu

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