I am coding a very basic problem but I am stuck in reading input of an array in one row. I have used the technique used mentioned in How to user input the array elements in c++ in one line but I see that it doesn't work and it gives 'segmentation fault` in subsequent execution steps. I have included my code below.
#include<iostream>
#include<sstream>
#include <string>
#include<vector>
#include<algorithm>
using namespace std;
int main()
{
int n,i,j,max=0,k,l;
cin>>n;
for(i=0;i<n;i++)
{
vector<int> v1;
stringstream iss;
string s;
int value={0};
max=0;
getline(cin,s);
iss<<s;
while(iss>>value)
{
cout<<"Pushing values";
v1.push_back(value);
}
//cout<<"After pushing";
cout<<v1[0];
}
return 0;
}
It gives segmentation fault in the line cout<<v1[0];. Actually values aren't being pushed into the vector which can be checked simply uncommenting cout<<"After pushing"; and commenting cout<<v1[0];.
What is the problem here?
Actually my input looks like this:
4
1 3 4
1 10 100
21 88 17
23 34 45
Also I am wondering how to separate the nos after reading in a string if a space is existent between them?
std::cin remains \n after >> operator. You can simply use cin.get() to remove newline character.
fixed code:
#include<iostream>
#include<sstream>
#include <string>
#include<vector>
#include<algorithm>
using namespace std;
int main()
{
int n,i,j,max=0,k,l;
cin>>n;
cin.get();
for(i=0;i<n;i++)
{
vector<int> v1;
stringstream iss;
string s;
int value={0};
max=0;
getline(cin,s);
iss<<s;
while(iss>>value)
{
cout<<"Pushing values";
v1.push_back(value);
}
//cout<<"After pushing";
cout<<v1[0];
}
return 0;
}