#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <assert.h>

// WRONG SYNTAX - Will work but do not do it like this.

int main(int argc, char* argv[]) {

    int* a_n = (int*) malloc(sizeof *a_n); // WRONG:  do not use typecast here
    
    // sizeof is an operator that takes either a type or an expression.
    // The C language allows either of these:
    //  int n = 5;
    //  sizeof n  <------ USE sizeof expression   or  sizeof (expression)
    //  sizeof(int)  <--- DO NOT USE sizeof(TYPE)

    assert(4 == sizeof 100000);  // assert:  an int takes 4 bytes on our platform

    *a_n = 5;
    printf("*a_n == %d\n", *a_n);
    
    free(a_n);

    return EXIT_SUCCESS;
}
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