Write a c program to modify the constant variable in c?

Question

I assume that constant must be initialized to a constant value at compile time, but following code the return value of ge_const() is assigned to x which will be collected at run time. So this must cause an error but I am getting the output as 50. Can someone clarify the detail?

main()
{
    const int x = get_const();
    printf("%d", x);
}
int get_const()
{
    return 50;
}

Answer 1

It is not a good programming to do that.
But still if you want then using POINTER you can do that.

Answer 2

It is a bad programming, because you wanted to change the property of constant itself.
Its not a good advise to change the const variable value if you wanted to change the variable value then why you are using const use a normal variable.

Anyways you can do it by using a pointer.
For example:

int main()
{
    const int i = 1;
    int *ptr = &i;

    printf("value of i before changing = %d\n", i);

    *ptr = 2;
    printf("value of i after changing =  %d\n", i);
    return 0;
}

output will be:
value of i before changing = 1
value of i after changing = 2

Answer 3

You can modify constant variable with the help of pointers.

For example:

#include<stdio.h>
int main(){
    int i=10;
    int *ptr=&i;
    *ptr=(int *)20;
    printf("%d",i);
    return 0;
}

Output: 20