//Course: CPSC240
//Assignment: Example of an X86-64 program called by a C driver.
//Due: 2011-Feb-7
//File: triangle64.c
//Purpose: Demonstrate use of C subprograms printf and scanf for IO actions.
//
//Data passing from the X86-64 program to the C subprograms follows the standard 64-bit calling
//convention.  In this case the program was tested successfully on a 64-bit machine Ubuntu platform.
//
//
//Compile only:                           gcc -c -Wall -m64 -std=c99 -l triangle.lis -o triangle.o triangle.c
//Link only:                              gcc -m64 -o triangle.out perimeter.o triangle.o
//Execute in 64-bit protected mode:       ./triangle.out
//
//
#include <stdio.h>
#include <stdint.h> //For C99.  
//C99 is presently the newest standard for C-language.  Most modern C-compilers conform to the C99
//standard.  The GNU compiler known as gcc is C99 compliant.  Assembly languages then must be C99 
//compliant in order for the assembly object files to be linked to C object files.
 
//Traditional prototype follows.
extern unsigned long int computeperimeter();
 
int main()
{
  int x = 32;
  int* p = &x;
  x = p;
  printf("%x", x);
}
 

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