Pushing back a vector gives absurd results (C++) - c++

Question

Hello so I've seen some other posts about it but they never seem to solve my issue, or I just can't understand it with my peanut sized brain.
If I input something, and push it back to the vector, it would always have some stupidly absurd number(s)
For those who want context or in case it's outside of what I think is the problem, here's the full code:
#include <iostream>
#include <string>
#include <array>
#include <algorithm>
#include <vector>
using namespace std;
void stringToVec(string input, vector<int> output)
{
int e = 0;
string temp;
//cout << "size: " << input.size() << '\n';
for(int i = 0; i < input.size(); i++)
{
if(input[i] != ' ')
{
temp += input[i];
}
else if(input[i] == ' ')
{
int num = stoi(temp);
output.push_back(num);
temp = ""; // clear temp
}
}
}
int main()
{
int a, b;
string numsIn1, numsIn2;
cin >> a;
cin >> ws;
getline(cin, numsIn1);
numsIn1 += ' ';
int nums1[a];
// =======================
cin >> b;
cin >> ws;
getline(cin, numsIn2);
numsIn2 += ' ';
int nums2[b];
// =======================
vector<int> output;
stringToVec(numsIn1, output);
stringToVec(numsIn2, output);
int e = 0;
for(int i = 0; i < a; i++)
{
output.push_back(nums1[i]);
}
for(int i = 0; i < b; i++)
{
output.push_back(nums2[i]);
}
sort(output.begin(), output.end());
//int dyfslashj[3] = {3, 2, 1};
for(int i = 0; i < a + b; i++)
{
cout << output[i] << ' ';
}
return 0;
}
Here's the line thats most likely to be the problem. For example if I input the number "3 4 2" the vector would be like "5234523452345 32452 34523", or some absurd value
void stringToVec(string input, vector<int> output)
{
int e = 0;
string temp;
//cout << "size: " << input.size() << '\n';
for(int i = 0; i < input.size(); i++)
{
if(input[i] != ' ')
{
temp += input[i];
}
else if(input[i] == ' ')
{
int num = stoi(temp);
output.push_back(num);
temp = ""; // clear temp
}
}
}

Answer 1

maybe there are something wrong with your "cin". I can see you used cin and getline. But getline will read at the first line.No matter it have been "cin".you can try to use some strings as parameter to the function to see whether it's correct or not