From: Sam Moore <sam@daedalus.(none)>
Date: Thu, 6 Sep 2012 10:54:17 +0000 (+0800)
Subject: Parallel Programming - Single threaded version done
X-Git-Url: https://git.ucc.asn.au/?a=commitdiff_plain;h=8050cacaa489292c82977b3d87971eaf9ca3c39b;p=matches%2Fhonours.git

Parallel Programming - Single threaded version done

Graphics and simulation code seperated as much as possible.
Got rid of inconsistancies in original style, made it as similar to my own as possible without insane over engineering.
Only minor amount of over engineering done!
---

diff --git a/course/semester2/pprog/assignment1/Makefile b/course/semester2/pprog/assignment1/Makefile
index b1a9b132..c1646243 100644
--- a/course/semester2/pprog/assignment1/Makefile
+++ b/course/semester2/pprog/assignment1/Makefile
@@ -1,20 +1,23 @@
 #Makefile for nbody program
 
-CXX = gcc --std=c99 -Wall -pedantic  -g -lm -lGL -lglut -lGLU -lpthread -fopenmp
+CXX = gcc
+LIBRARIES = -lm -lGL -lglut -lGLU -lpthread
+FLAGS = --std=c99 -Wall -pedantic -g
+PREPROCESSOR_FLAGS = -fopenmp
 LINK_OBJ = main.o nbody.o graphics.o
 
 BIN = nbody
 
-$(BIN) : $(OBJ) 
-	$(CXX) -o $(BIN) $(OBJ)
+$(BIN) : $(LINK_OBJ) 
+	$(CXX) -o $(BIN) $(LINK_OBJ) $(LIBRARIES)
 
 %.o : %.c
-	$(CXX) -c $<
+	$(CXX) $(FLAGS) $(PREPROCESSOR_FLAGS) -c $<
 
 clean :
-	$(RM) $(BIN) $(OBJ) $(LINKOBJ)
+	$(RM) $(BIN) $(OBJ) $(LINK_OBJ)
 
 clean_full: #cleans up all backup files
-	$(RM) $(BIN) $(OBJ) $(LINKOBJ)
+	$(RM) $(BIN) $(OBJ) $(LINK_OBJ)
 	$(RM) *.*~
 	$(RM) *~
diff --git a/course/semester2/pprog/assignment1/fields/10 b/course/semester2/pprog/assignment1/fields/10
new file mode 100644
index 00000000..6ef79370
--- /dev/null
+++ b/course/semester2/pprog/assignment1/fields/10
@@ -0,0 +1,11 @@
+10
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diff --git a/course/semester2/pprog/assignment1/fields/100 b/course/semester2/pprog/assignment1/fields/100
new file mode 100644
index 00000000..72a4325a
--- /dev/null
+++ b/course/semester2/pprog/assignment1/fields/100
@@ -0,0 +1,101 @@
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diff --git a/course/semester2/pprog/assignment1/fields/500 b/course/semester2/pprog/assignment1/fields/500
new file mode 100644
index 00000000..65a13606
--- /dev/null
+++ b/course/semester2/pprog/assignment1/fields/500
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+1e7 -99.000000 3.000000 -0.300000 0.200000 6.600000 0.004000
+1e7 -21.000000 52.000000 0.500000 0.600000 0.242308 0.001000
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+1e7 -98.000000 -62.000000 0.400000 0.600000 -0.948387 0.004000
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+1e7 1.000000 41.000000 -0.400000 0.800000 -0.019512 0.001000
+1e7 37.000000 -96.000000 0.200000 0.600000 0.231250 0.001000
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+1e7 81.000000 -41.000000 -0.100000 0.600000 1.185366 0.001000
+1e7 -61.000000 32.000000 0.000000 0.800000 1.525000 0.004000
+1e7 -77.000000 -55.000000 -0.600000 0.600000 -0.840000 0.001000
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+1e7 -95.000000 50.000000 -0.900000 0.400000 0.760000 0.001000
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+1e7 66.000000 -90.000000 -0.900000 0.200000 0.146667 0.004000
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+1e7 -5.000000 92.000000 -0.900000 0.600000 0.032609 0.001000
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+1e7 12.000000 -9.000000 -0.600000 0.200000 0.266667 0.003000
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diff --git a/course/semester2/pprog/assignment1/graphics.c b/course/semester2/pprog/assignment1/graphics.c
index 62711be6..614c2bfd 100644
--- a/course/semester2/pprog/assignment1/graphics.c
+++ b/course/semester2/pprog/assignment1/graphics.c
@@ -1,12 +1,27 @@
 /**
  * @file graphics.c
  * @author Sam Moore (20503628) 2012 - adapted from template program provided by UWA
- * @pur
+ * @purpose Definition of graphics related functions
+ */
+
+#include "graphics.h" //Function declarations
+#include <time.h> // Needed for clock
+#include <math.h> // Maths functions (sin, cos)
+/**
+ * Variables
+ */
+double previousTime, eyeTheta, eyePhi, eyeRho;
+float look[3];
+int windowWidth, windowHeight, upY;
 
-/*
- * Initialization of graphics
+double scale = 1.0;
+
+
+/**
+ * Initialise the graphics
  */
-void Init(void) {
+void Graphics_Init(void) 
+{
     
 	glClearColor(1.0,1.0,1.0,0.0);
 	glColor3f(0.0f, 0.0f, 0.0f);
@@ -23,48 +38,115 @@ void Init(void) {
 	glMaterialfv(GL_FRONT, GL_SHININESS, mat_shininess);
 	glLightfv(GL_LIGHT0, GL_POSITION, light_position);
 
-    glColorMaterial(GL_FRONT,GL_DIFFUSE);                // Set Color Capability
+	glColorMaterial(GL_FRONT,GL_DIFFUSE);                // Set Color Capability
     
 	glEnable(GL_LIGHTING);
 	glEnable(GL_LIGHT0);
 	glEnable(GL_DEPTH_TEST);
     
-    glEnable(GL_COLOR_MATERIAL);		       // Enable color
+	glEnable(GL_COLOR_MATERIAL);		       // Enable color
 
-	double displayRatio = 1.0 * WIDTH / HEIGHT;
+	
 	windowWidth = WIDTH;
 	windowHeight = HEIGHT;
 	previousTime = clock();
 	eyeTheta = 0;
-    eyePhi = 0.5 * M_PI;
-    eyeRho = RHO;
-    upY = 1;
+	eyePhi = 0.5 * M_PI;
+	eyeRho = RHO;
+	upY = 1;
 	look[0] = 0;
 	look[1] = 0;
 	look[2] = 0;
-    gluPerspective(VIEW_ANGLE, displayRatio, WORLD_NEAR, WORLD_FAR);  
+	gluPerspective(VIEW_ANGLE, (double)WIDTH/(double)HEIGHT, WORLD_NEAR, WORLD_FAR);  
 }
 
-/*
+/**
  * This function redraws the screen after the positions of particles 
  * have been updated
  */
-void Display(void) {
+void Graphics_Display(System * s) 
+{
 	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 	glMatrixMode(GL_MODELVIEW);
-    glLoadIdentity();
-    gluLookAt(eyeRho * sin(eyePhi) * sin(eyeTheta), eyeRho * cos(eyePhi),
-                    eyeRho * sin(eyePhi) * cos(eyeTheta),
-					look[0], look[1], look[2], 0, upY, 0);
-
-	for (int i = 0; i < N; i++) {
-        //glClearColor(1.0,1.0,1.0,0.0);
-		glColor3f(0.0f, body[i].mass/1e11*100, 0.0f);
-        //glColor3f(1.0f, 0.0f, 0.0f);
+	glLoadIdentity();
+	gluLookAt(eyeRho * sin(eyePhi) * sin(eyeTheta), eyeRho * cos(eyePhi),
+		eyeRho * sin(eyePhi) * cos(eyeTheta),look[0], look[1], look[2], 0, upY, 0);
+
+	for (int i = 0; i < s->N; ++i) 
+	{
+		Body * b = s->body+i;
+		glColor3f(0.0f, b->mass/1e11*100, 0.0f);
 		glPushMatrix(); // to save the current matrix
-		glTranslated(SCALE*body[i].X, SCALE*body[i].Y, SCALE*body[i].Z);
+		glTranslated(scale*b->x[0], scale*b->x[1], scale*b->x[2]);
 		glutSolidSphere (BALL_SIZE, 10, 10);
 		glPopMatrix(); // restore the previous matrix
 	}
 	glFlush();
 }
+
+/**
+ * This function is to manipulate with the image
+ */
+void Graphics_Keyboard(unsigned char theKey, int mouseX, int mouseY) 
+{
+	if (theKey == 'x' || theKey == 'X') 
+	{
+		exit(EXIT_SUCCESS);
+	}
+
+		if (theKey == 'i' || theKey == 'I') {
+			eyePhi -= M_PI / 20;
+		if (eyePhi == 0)
+				eyePhi = 2 * M_PI;
+		} else if (theKey == 'm' || theKey == 'I') {
+			eyePhi += M_PI / 20;
+		} else if (theKey == 'j' || theKey == 'J') {
+			eyeTheta -= M_PI / 20;
+		} else if (theKey == 'k' || theKey == 'K') {
+			eyeTheta += M_PI / 20;
+		} else if (theKey == ',') {
+			eyeRho += 0.5;
+		} else if (theKey == '.' || theKey == 'I') {
+			eyeRho -= 0.5;
+		} else if (theKey == 'w' || theKey == 'W') {
+			look[1] += 0.5;
+		} else if (theKey == 'z' || theKey == 'Z') {
+			look[1] -= 0.5;
+		} else if (theKey == 'a' || theKey == 'A') {
+			look[0] -= 0.5;
+		} else if (theKey == 's' || theKey == 'S') {
+			look[0] += 0.5;
+		} else if (theKey == '+') {
+			scale *= 1.1;
+		} else if (theKey == '-') {
+			scale *= 0.9;
+		}
+		if (sin(eyePhi) > 0) upY = 1;
+		else upY = 1;
+}
+
+/**
+ * Resize the view window
+ */
+void Graphics_Reshape(int width, int height) 
+{
+	double displayRatio = 1.0 * width / height;
+	windowWidth = width;
+	windowHeight = height;
+	glMatrixMode(GL_PROJECTION);
+	glLoadIdentity();
+	gluPerspective(VIEW_ANGLE, displayRatio, WORLD_NEAR, WORLD_FAR);
+	glViewport(0, 0, windowWidth, windowHeight);
+}
+
+
+/**
+ * This function is called repeatedly by graphics library. You can consider 
+ * it as main loop in the program.
+ */
+void Graphics_Animate(void) 
+{
+
+	System_Compute(&universe); //Compute and update new positions for the time step
+	Graphics_Display(&universe); // Display needs to be called to redraw the screen
+}
diff --git a/course/semester2/pprog/assignment1/graphics.h b/course/semester2/pprog/assignment1/graphics.h
index 01ca839a..b437c143 100644
--- a/course/semester2/pprog/assignment1/graphics.h
+++ b/course/semester2/pprog/assignment1/graphics.h
@@ -13,8 +13,8 @@
 
 #include "nbody.h"
 
-#define SCREEN_WIDTH 800
-#define SCREEN_HEIGHT 800
+#define WIDTH 800
+#define HEIGHT 800
 #define POINT_SIZE 1
 #define POSITION_X 112
 #define POSITION_Y 20
@@ -34,6 +34,7 @@ void Graphics_Init(void);
 void Graphics_Display(System * s);
 void Graphics_Keyboard(unsigned char key, int mouse_x, int mouse_y);
 void Graphics_Reshape(int width, int height);
+void Graphics_Animate(void);
 
 #endif //_GRAPHICS_H
 
diff --git a/course/semester2/pprog/assignment1/main.c b/course/semester2/pprog/assignment1/main.c
index 28e6409b..22bd8674 100644
--- a/course/semester2/pprog/assignment1/main.c
+++ b/course/semester2/pprog/assignment1/main.c
@@ -1,6 +1,45 @@
+
 #include <stdlib.h>
 #include <stdio.h>
+
 #include "nbody.h"
 #include "graphics.h"
 
+unsigned numberOfProcessors;
+
+System universe;
+
+// This is main function. Do not change it.
+int main(int argc, char** argv)
+{
+	glutInit(&argc, argv);
+
+	if (argc < 2) {
+		puts("Please provide the filename, i.e. \'nbody bodiesfield.dat\'");
+	    exit(EXIT_SUCCESS);
+	}
+	if (argc == 2)
+	{
+		System_Init(&universe,argv[1]);
+	}
+	if (argc == 3) numberOfProcessors = atoi(argv[2]);
+
+
+
+	glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
+	glutInitWindowSize(WIDTH, HEIGHT);
+	glutInitWindowPosition(POSITION_X, POSITION_Y);
+	glutCreateWindow("N-Body Parallel");
+	glutDisplayFunc(Graphics_Display);
+	glutIdleFunc(Graphics_Animate);
+	glutKeyboardFunc(Graphics_Keyboard);
+	glutReshapeFunc(Graphics_Reshape);
+	Graphics_Init();
+
+
+	printf("Use:\n X - exit\n I, J, K, M - rotate\n W, Z, A, S - move to view"
+         " point\n ./, - zoom in/out\n +/- - scaled zoom in/out\n");
+
 
+	glutMainLoop();
+}
diff --git a/course/semester2/pprog/assignment1/nbody.c b/course/semester2/pprog/assignment1/nbody.c
index 07761607..d2062e46 100644
--- a/course/semester2/pprog/assignment1/nbody.c
+++ b/course/semester2/pprog/assignment1/nbody.c
@@ -4,219 +4,134 @@
  * @purpose N-Body simulator - Definition of simulation functions; single threaded version
  */
 
-#include <math.h>
 #include <stdlib.h>
 #include <stdio.h>
-#include <string.h>
+#include <math.h>
 #include <time.h>
-#include <omp.h>
-#include <GL/gl.h>
-#include <GL/glut.h>
-
-double previousTime, eyeTheta, eyePhi, eyeRho;
-float look[3];
-int windowWidth, windowHeight, upY;
-
-double SCALE = 1;
-
-Particle *body;
-int N;
-int numberOfProcessors=1;
-
+#include <string.h>
 
+#include "nbody.h"
 
-/*
+/**
  * Prints the body on screen
  */
-void PrintBody(int i)
+void Body_Print(Body * a)
 {
-	printf("Body #%d M=%f X=%f Y=%f Z=%f Fx=%f Fy=%f Fz=%f Vx=%f Xy=%f Vz=%f\n", 
-           i, body[i].mass, body[i].X, body[i].Y, body[i].Z, body[i].Fx, 
-           body[i].Fy, body[i].Fz,	body[i].Vx, body[i].Vy, body[i].Vz);
+	printf("Body %p M=%f X=%f Y=%f Z=%f Fx=%f Fy=%f Fz=%f Vx=%f Vy=%f Vz=%f\n", 
+           (void*)a, a->mass, a->x[0], a->x[1], a->x[2], a->F[0], a->F[1], a->F[2], a->v[0], a->v[1], a->v[2]);
 }
 
-/*
+/**
  * Computing forces
  */
-void Force(int a) {
+void Body_Force(Body * a, System * s) 
+{
 	double distance;
 	double con;
 	double gd;
 
-	body[a].Fx = body[a].Fy = body[a].Fz = 0;
-
-	for(int b=0; b<N; ++b)
-		if( b != a ){
-		distance = sqrt(square(body[b].X - body[a].X) + square(body[b].Y
-                                - body[a].Y) + square(body[b].Z - body[a].Z));
-		con = G * body[a].mass * body[b].mass / square(distance);
-		gd = con / distance;
-		body[a].Fx += gd * (body[b].X - body[a].X);
-		body[a].Fy += gd * (body[b].Y - body[a].Y);
-		body[a].Fz += gd * (body[b].Z - body[a].Z);
-		}
+	for (unsigned i = 0; i < DIMENSIONS; ++i)
+		a->F[i] = 0;
+
+	for (unsigned index = 0; index < s->N; ++index)
+	{
+		Body * b = s->body+index;
+		if (b == a)
+			continue;
+		
+		distance = 0.0;
+		for (unsigned i = 0; i < DIMENSIONS; ++i)
+			distance += square(b->x[i] - a->x[i]);
+		distance = sqrt(distance);
+		con = G * a->mass * b->mass / square(distance);
+		gd = con / distance;	
+		for (unsigned i = 0; i < DIMENSIONS; ++i)
+			a->F[i] += gd * (b->x[i] - a->x[i]);
+	}
 }
 
-/*
+/**
  * Compute velocities
  */
-void Velocity(int a) {
-		body[a].Vx += body[a].Fx/body[a].mass * DELTA_T;
-		body[a].Vy += body[a].Fy/body[a].mass * DELTA_T;
-		body[a].Vz += body[a].Fz/body[a].mass * DELTA_T;
+void Body_Velocity(Body * a) 
+{
+	for (unsigned i = 0; i < DIMENSIONS; ++i)
+		a->v[i] += a->F[i] / a->mass * DELTA_T;
 }
 
-/*
+/**
  * Compute positions
  */
-void Position(int a) {
-	body[a].X += body[a].Vx * DELTA_T;
-	body[a].Y += body[a].Vy * DELTA_T;
-	body[a].Z += body[a].Vz * DELTA_T;
+void Body_Position(Body * a) 
+{
+	for (unsigned i = 0; i < DIMENSIONS; ++i)
+		a->x[i] += a->v[i] * DELTA_T;
 }
 
-/*
+/**
  * Main compute function
  */
-void Compute() {
-	clock_t start, finish;
+void System_Compute(System * s) 
+{
+//	clock_t start, finish;
 
-	start = clock();
+//	start = clock();
 
-	for(int a=0; a<N; a++) {
-		Force(a); // compute force
-		Velocity(a);
-		Position(a);
+	for (unsigned i = 0; i < s->N; ++i)
+	{
+		Body_Force(s->body+i, s);
+		Body_Velocity(s->body+i);
+		Body_Position(s->body+i);
 	}
 
-	finish = clock();
-	printf("Performance: %ld clock ticks per computation cycle\n", finish-start);
-
-	//	PrintBody(0);
-//	PrintBody(N-1);
 }
 
-/*
- * This function is called repeatedly by graphics library. You can consider 
- * it as main loop in the program.
- */
-void Animate(void) {
 
-	Compute(); //Compute and update new positions for the time step
-	Display(); // Display needs to be called to redraw the screen
-}
-
-/*
- * This function is to manipulate with the image
- */
-void KeyBoard(unsigned char theKey, int mouseX, int mouseY) {
-	if (theKey == 'x' || theKey == 'X') {
-		free(body);
-		exit(EXIT_SUCCESS);
-	}
-		if (theKey == 'i' || theKey == 'I') {
-			eyePhi -= M_PI / 20;
-		if (eyePhi == 0)
-				eyePhi = 2 * M_PI;
-		} else if (theKey == 'm' || theKey == 'I') {
-			eyePhi += M_PI / 20;
-		} else if (theKey == 'j' || theKey == 'J') {
-			eyeTheta -= M_PI / 20;
-		} else if (theKey == 'k' || theKey == 'K') {
-			eyeTheta += M_PI / 20;
-		} else if (theKey == ',') {
-			eyeRho += 0.5;
-		} else if (theKey == '.' || theKey == 'I') {
-			eyeRho -= 0.5;
-		} else if (theKey == 'w' || theKey == 'W') {
-			look[1] += 0.5;
-		} else if (theKey == 'z' || theKey == 'Z') {
-			look[1] -= 0.5;
-		} else if (theKey == 'a' || theKey == 'A') {
-			look[0] -= 0.5;
-		} else if (theKey == 's' || theKey == 'S') {
-			look[0] += 0.5;
-		} else if (theKey == '+') {
-			SCALE *= 1.1;
-		} else if (theKey == '-') {
-			SCALE *= 0.9;
-		}
-		if (sin(eyePhi) > 0) upY = 1;
-		else upY = 1;
-}
 
-void Reshape(int width, int height) {
-	double displayRatio = 1.0 * width / height;
-	windowWidth = width;
-	windowHeight = height;
-	glMatrixMode(GL_PROJECTION);
-    glLoadIdentity();
-    gluPerspective(VIEW_ANGLE, displayRatio, WORLD_NEAR, WORLD_FAR);
-	glViewport(0, 0, windowWidth, windowHeight);
-}
 
 /*
  * This function reads an input file. You can change it if you choose a 
  * different file format
  */
-void readFile(char *fileName) {
+#define LINE_SIZE BUFSIZ
+void System_Init(System * s, char *fileName) 
+{
 	char line[LINE_SIZE];
-	char *token;
-	FILE *file;
+	char * token;
+	FILE * file;
 
 	file = fopen(fileName, "rt");
-	N = atoi(fgets(line, LINE_SIZE, file));
-	body = (Particle*) calloc((size_t)N, sizeof(Particle));
-
-	puts("----------------------Initial field-------------------------------");
-
-	for (int i=0; i<N; ++i)
-		if(fgets(line, LINE_SIZE, file) != NULL){
-		token = strtok(line, ",; ");
-		body[i].mass = atof(token);
-		token = strtok(NULL, ",; ");
-		body[i].X = atof(token);
-		token = strtok(NULL, ",; ");
-		body[i].Y = atof(token);
-		token = strtok(NULL, ",; ");
-		body[i].Z = atof(token);
-		token = strtok(NULL, ",; ");
-		body[i].Vx = atof(token);
-		token = strtok(NULL, ",; ");
-		body[i].Vy = atof(token);
-		token = strtok(NULL, ",; ");
-		body[i].Vz = atof(token);
-
-		PrintBody(i);
+	s->N = atoi(fgets(line, LINE_SIZE, file));
+	s->body = (Body*) calloc((size_t)s->N, sizeof(Body));
+
+	//printf("----------------------Initial field-------------------------------\n");
+
+	for (unsigned i = 0; i < s->N; ++i)
+	{
+		if (fgets(line, LINE_SIZE, file) != NULL)
+		{
+			Body * a = s->body+i;
+			token = strtok(line, ",; ");
+			a->mass = atof(token);
+			
+			for (unsigned j = 0; j < DIMENSIONS; ++j)
+			{
+				token = strtok(NULL, ",; ");
+				a->x[j] = atof(token);
+			}
+			for (unsigned j = 0; j < DIMENSIONS; ++j)
+			{
+				token = strtok(NULL, ",; ");
+				a->v[j] = atof(token);
+			}
+			//Body_Print(a);
 		}
-	puts("--------------------------------------------------------------");
-	puts("Use:\n X - exit\n I, J, K, M - rotate\n W, Z, A, S - move to view"
-         " point\n ./, - zoom in/out\n +/- - scaled zoom in/out\n");
+	}
 
+	//printf("--------------------------------------------------------------\n");
+	
 	fclose(file);
 }
 
 
-// This is main function. Do not change it.
-int main(int argc, char** argv)
-{
-	glutInit(&argc, argv);
 
-	if (argc < 2) {
-		puts("Please provide the filename, i.e. \'nbody bodiesfield.dat\'");
-	    exit(EXIT_SUCCESS);
-	}
-	if (argc == 2) readFile(argv[1]);
-	if (argc == 3) numberOfProcessors = atoi(argv[2]);
-
-	glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
-	glutInitWindowSize(WIDTH, HEIGHT);
-	glutInitWindowPosition(POSITION_X, POSITION_Y);
-	glutCreateWindow("N-Body Parallel");
-	glutDisplayFunc(Display);
-	glutIdleFunc(Animate);
-	glutKeyboardFunc(KeyBoard);
-	glutReshapeFunc(Reshape);
-	Init();
-	glutMainLoop();
-}
diff --git a/course/semester2/pprog/assignment1/nbody.h b/course/semester2/pprog/assignment1/nbody.h
index 37232051..0853c2b7 100644
--- a/course/semester2/pprog/assignment1/nbody.h
+++ b/course/semester2/pprog/assignment1/nbody.h
@@ -28,12 +28,12 @@ typedef struct
 	double x[DIMENSIONS];
 	double v[DIMENSIONS];
 	double F[DIMENSIONS];
-	int colour;
 
 } Body;
 
 /**
- * Structure to store an array of bodies, along with the size of the array
+ * Structure to store an array of bodies, along with the size of the array.
+ * The universe is represented in a single System. 
  * @param N - Size of the array
  * @param body - The array of bodies
  */
@@ -49,10 +49,10 @@ void Body_Force(Body * a, System * s); //Compute force on body a due to system o
 void Body_Velocity(Body * a); //Compute velocity of body a
 void Body_Position(Body * a); //Compute position of body a
 
-System * System_Init(char * fileName); //Initialise System (array of bodies) from a text file
-
-void System_Step(System * system); //Perform a single computation step for a System
+void System_Init(System * s, char * fileName); //Initialise System (array of bodies) from a text file
 
+void System_Compute(System * system); //Perform a single computation step for a System of bodies
 
+extern System universe; // The main array of bodies; global variable.
 
 #endif //_NBODY_H