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Declaring and using a C function in Objective C
natural_t report_memory(void) {
    struct task_basic_info info;
    mach_msg_type_number_t size = sizeof(info);
    kern_return_t kerr = task_info(mach_task_self(),
                               TASK_BASIC_INFO,
                               (task_info_t)&info,
                               &size);
    if( kerr == KERN_SUCCESS ) {
        return info.resident_size;
    } else {
        NSLog(@"Error with task_info(): %s", mach_error_string(kerr));
        return 0;
    }
}

natural_t report_memory(void);

NSLog(@"Memory used: %u", rvC.report_memory());

rvC.report_memory()

report_memory()

extern natural_t report_memory(void);