Stack frame enum test, C (gcc)

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//gcc 5.4.0

#include <stdio.h>
#include <string.h>
                  
typedef enum{
    e_state_invalid, // <-- default value to prevent non-initialization
    e_state_boot,
    e_state_config,
    e_state_idle,
    e_state_running,
    e_state_last    //    <-- last for validation
}e_system_state;

void garbage_to_stack()
{
    e_system_state garbage = e_state_last;
    printf("garbage at\t\t%p\r\n", &garbage);
}

void garbage_array_to_stack()
{
    e_system_state garbage[1];
    int test;
    memset(garbage, e_state_last, 1);
    printf("garbage array at\t%p\r\n", &garbage[0]);
    printf("test array at\t\t%p\r\n", &test, test);
}

void print_int()
{
    int test;
    printf("test at\t\t\t%p\ttest = %x\r\n", &test, test);
}

void print_enum()
{
    e_system_state current_state;
    printf("current_state at\t%p\tcurrent_state = %x\r\n", &current_state, current_state);
}

int main(void)
{
    garbage_to_stack();
    garbage_array_to_stack();
    
    print_int();
    print_enum();
    print_int();
    
    printf("e_state_invalid = %d\r\n", e_state_invalid);
    printf("e_state_boot = %d\r\n", e_state_boot);
    printf("e_state_config = %d\r\n", e_state_config);
    printf("e_state_idle = %d\r\n", e_state_idle);
    printf("e_state_running = %d\r\n", e_state_running);
    printf("e_state_last = %d\r\n", e_state_last);
    return 0;
}

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Compilation time: 0.12 sec, absolute running time: 0.07 sec, cpu time: 0.01 sec, memory peak: 3 Mb, absolute service time: 0,27 sec