Where to put && symbol

#1

when i am adding while statment
while(temp->next!=NULL && temp->next->data < curr->data)

and

while(temp->next->data < curr->data && temp->next!=NULL)

the second one is giving segmentation fault whereas first one code is running fine why is that

code- https://ide.codingblocks.com/s/340522

#2

In the first case you don’t get segmentation fault because you never check for an invalid memory location , where as in the second case you do make a check and thus get a SIGSEGV.
A similar code to this is as follows

#include <bits/stdc++.h>
using namespace std;
int main() {
    int i = -1;
    vector<int>v;
    while(v[i]<5&&i!=-1) cout<<"A";
}
#3

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