Why I get this error ?

Question

Hi, Im wondering why i get this error, and can you please explain what is the porpose of auto x : adj ?
Here is the code :

#include <iostream>
#include <vector>
using namespace std;

// Add edge
void addEdge(vector<int> adj[], int s, int d) {
adj[s].push_back(d);
adj[d].push_back(s);
}

void printGraph(vector<int> adj[], int V)
{
for (int d = 0; d < V; ++d)
{
cout << "\n Vertex "<< d << ":";

for (auto x : adj[d])
{cout << "-> " << x;}

}

}

int main() {
int V = 5;

// Create a graph
vector<int> adj[V];
// Add edges
addEdge(adj, 0, 1);
printGraph(adj,V);
}

Answer 1

Ovidiu Călin Try this one

#include <iostream>
#include <vector>
using namespace std;

// Add edge
void addEdge(vector<int> adj[], int s, int d) {
adj[s].push_back(d);
adj[d].push_back(s);
}

void printGraph(vector<int> adj[], int V)
{
for (int d = 0; d < V; ++d)
{
cout << "\n Vertex "<< d << ":";

for (unsigned int i = 0; i < adj[d].size(); i++)
{cout << "-> " << adj[d][i];}

}

}

int main() {
int V = 5;

// Create a graph
vector<int> adj[V];
// Add edges
addEdge(adj, 0, 1);
printGraph(adj,V);
return 0;
}

Answer 2

try changing auto to int

Answer 3

your compiler doesn’t support c++11????

Answer 4

Ovidiu Călin Check this link, it should resolve your issue.
https://stackoverflow.com/questions/35723856/need-to-enable-c11-in-codeblocks

Answer 5

what is the error?
that prints all the nodes that is connected to d

Answer 6

Yes there are no errors, I have also ran it.

Answer 7

add
return 0;
at the end of your code

Answer 8

THANK YOU

Answer 9

blACk sh4d0w

Answer 10

Worked like a charm

Answer 11

Bobby Fischer I am thinking same, his compiler doesn't support C++11 otherwise range-based for loop should have worked.

Answer 12

Thanks i'll check it

Answer 13

I get x does not name a type

Answer 14

Looks like IDE is broken..

Answer 15

Now it opens but then crashes..

Answer 16

Im using codeblocks mabe find another

Answer 17

Same thing

Answer 18

I dont know rlly

Answer 19

Should i update codeblocks ?