Unable to assign value in variable of Structure in C using Pointer

Question

My Code:-

#include<stdio.h>
struct Demo{
    int value;
};
int main(){
    struct Demo *l;
    l->value=4;
}

Getting Segmentation fault (core dumped)

Answer 1

because L object doesn't point something. use this :

#include <iostream>
using namespace std;
struct Demo
{
    int val;    
};
int main()
{
    Demo* a = new Demo();
    a->val = 10;
    cout<<a->val;
}