dangling pointer

PHOTO EMBED

Sat Jun 11 2022 06:18:12 GMT+0000 (Coordinated Universal Time)

Saved by @KanishqJ8 

#include <stdlib.h>

int *functionDangling(){
    int a,b,sum;
    a=34;
    b=4;
    sum=a+b;
    return &sum;
}
    
int main(){
    //case1: deallocation a memory block
    int *ptr=(int*)malloc(7*sizeof(int)); 
    ptr[0]=34;
    free(ptr);//ptr is now a dangling pointer
    
    //case2: function returning local variable address
    int *dangPtr=functionDangling(); //ptr is now a dangling pointer
    
    //case3: if variable goes out of scope
    int*danglingPtr3;
    {
        int a=8;
        danglingPtr3=&a;
    }
    //here variable a goes out of scope which means danlingPtr3 is pointing to a location which is free and hence it is now a dangling pointer
    return 0; 
}
content_copyCOPY