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

int main(int argc, char* argv[]) {
    char* s1   = "ABC";  // string on the DATA SEGMENT
             // s1 is the address of string on the data segment.
             // The characters ('A', 'B', 'C') are on the data segment.
             // The address where the characters can be found is on the stack segment.
    char  s2[] = "ABC";  // string on the STACK SEGMENT
                         // s2 is an array of char's on the stack segment.
    printf("s1 == %s\n", s1);
    s2[2] = 'E';
    printf("s2 == %s\n", s2);

    char* s3 = s1;
    printf("s3 == %s\n", s3);

    char s4[] = s2;   // GCC ERROR: "error: invalid initializer"

    // DATA SEGMENT
    // - Cannot write to a string on the data segment.  ⇒ Segmentation fault
    // - Can assign an address of a string (char*) to another address of string (char*)
    //   directly.
    //
    // STACK
    // - CAN write to a string on the data segment.
    // - Cannot initialize a char[] with another char[].
    //
    // BOTH
    // - Cannot increase size of a string on the data segment or on the stack.
    
    return EXIT_SUCCESS;
}
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