What is the problem with the code why is it not summing the array correctly

Question

#include <iostream>
using namespace std;

int main() {

int size, x[size], y[size];

for(int i=0; i<2; i++)
cin>>x[i];

for(int i=0; i<2; i++)
cin>>y[i];

int z[size];

for(int i=0; i<2; i++)
z[i]=x[i]+y[i];

for(int i=0; i<2; i++)
cout<<z[i]<<"\t";

return 0; }

Answer 1

You're declaring your arrays x, y, and z. But the variable size to declare their size, but you haven't initialized size before using it, which leads to undefined behavior. I fixed those anomalies in your code and it runs great. Take a look:

https://sololearn.com/compiler-playground/cIw6qEUfI2Yt/?ref=app