Passiing vector as a parameter

[donda97]

This is why programming is so frustrating to me. In my class, I didnt even know what a C++ vector was until this assignment was due. ??? Anyway, I need to pass the vector declared in int main into the plusPlusN function so I can modify it. (If anyone cares, Im just suppose to take the vector's numerical equivalent and add one to it) But my issue is I can't pass this vector into my function without it crashing my computer or telling me my vector isnt just
9 9 but instead it says its like 9 9 921235654.
I know to some of you I look like an idiot but any help is appreciated.

#include <iostream>
#include <vector>

using namespace std;

vector<int> plusPlusN(vector<int> v)
{

    return v;
}

int main()
{
    vector<int> v {9, 9};
    vector<int> retVal = plusPlusN(v); // retVal = {1, 0, 0}
    return 0;
}

[helios]

The code you've posted doesn't really do anything. There's no way for it to crash or display anything, so I can't really help you with the problems you mentioned.

You can pass a vector by reference:

#include <vector>
#include <iostream>

//Note the ampersand, which declares the function parameter as a reference.
void f(std::vector<int> &v){
    v.push_back(42);
}

int main(){
    std::vector<int> a = {2, 4};
    for (auto i : a)
        std::cout << i << std::endl;
    std::cout << "-----\n";
    f(a);
    for (auto i : a)
        std::cout << i << std::endl;
}

[Chervil]

I don't see a problem with the code posted. Perhaps the problem is in some other part of the code.

[donda97]

Sorry I should've elaborated more.
1) I have the use the function stated above exactly as its written (means i cant pass by reference)
2)My code doesnt have anything because I cant find a way to pass it into the function

[Chervil]

Could you post your actual code which allows us to reproduce the same error which you are getting?

[helios]

The code you've shown is correctly passing a vector into the function and the function is correctly returning another vector to the caller. If you're having problems with some code then you should post that code.

[donda97]

#include <iostream>
#include <vector>

using namespace std;

vector<int> plusPlusN(vector<int> v)
{

    cout << "Vector: ";
    for (unsigned int i = 0; i<= v.size(); i++)
    {
       cout << v[i] << " ";
    }

    cout << endl;
    return v;
}

int main()
{
    vector<int> v {9, 9};
    vector<int> retVal = plusPlusN(v); // retVal = {1, 0, 0}
    return 0;
}

Here im just trying to show whats inside the vector v.

[JLBorges]

// for (unsigned int i = 0; i<= v.size(); i++)
for (unsigned int i = 0; i < v.size(); i++) // note: i less than v.size()  

[donda97]

Thank you so much!