#include <stdio.h>
#include <conio.h>
#include <dos.h>
#include <math.h>
#include <graphics.h>
#include <stdlib.h>
#define PI 3.1415926
float R=0.10; /* Radius of top - top view in rest frame */
int Rad=200; /* Scaled Radius - can be altered when the program asks for it */
float c=3.0E08; /* Speed of Light */
float w=1.2E09; /* Frequency of rotation of the top */
float beta=0.866, gamma=2.0; /* Initial default values - can be changed */
#define T (2*PI*gamma)/w /* Period of Rotation */
float accuracy=0.00001; /* Accuracy of evaluation of coordinates */
#define MAX 500 /* Maximum number of points */
float x[MAX],y[MAX]; /* Arrays storing space coordinates */
int px[MAX], py[MAX]; /* Space coordinates scaled to integers */
int i,j;
float time;
int ox, oy; /* Variables storing origin of plot */
float temp;
/* Function declarations */
float fcos(float x, float t, int i);
float fsin(float x, float t, int i);
/*Main Program */
int main()
{
/* Graphics Variables */
int gmode, gdriver;
/* default settings */
int frames=10, points=10, choice=1;
/* choice sets colour: here preset to blue */
/* External variables: altered when scale and beta are read as inputs */
extern int Rad;
extern float beta, gamma;
clrscr();
/* Prompt for data input: Quantities in brackets are suggested values */
printf("Enter Number of frames(16), Points(40), Frequency, Scale(200):");
scanf("%d%d%d%d",&frames,&points,&w,&Rad);
printf("\n\nEnter beta(0.866), must be less than 1:");
scanf("%f",&beta);
while (beta>=1){
printf("\n Beta must be less than 1:");
scanf("\%f",&beta);
}
gamma=1.0/sqrt(1.0-beta*beta);
clrscr();
/* Initializing Graphics */
gdriver=DETECT;
initgraph(&gdriver,&gmode,"C:\\TC:\\BGI");
setbkcolor(WHITE);
/* Sets origin of plot */
ox=getmaxx()/2;
oy=getmaxy()/2;
/* Initialize Points */
for (i=1;i<=points;i++){
temp=i;
y[i]=temp/points*R;
x[i]=0;
}
/* Begins plot */
for (j=0;j<=frames;j++){
setcolor(choice);
ellipse(ox,oy,0,360,(int)((float)Rad/gamma),Rad);
/* Plots the axes */
line(1,oy,2*ox,oy);
line(ox,1,ox,2*oy);
/* Sets time coordinates */
time=j*T/frames;
/* Evaluates the coordinates */
for (i=1;i<=points;i++){
x[i]=fcos(x[i],time,i);
y[i]=fsin(x[i],time,i);
/* scale coordinates to integers */
px[i]=Rad*x[i]/R;
py[i]=-Rad*y[i]/R;
}
/* Connects points by lines */
for (i=1;i<+points;i++){
setcolor(choice);
if (i==points) line(ox,oy,ox+px[i],oy+py[i]);
if (i<points) line(ox+px[i+1],oy+py[i+1],ox+px[i],oy+py[i]);
setcolor(choice);
/* Redraws ellipse */
ellipse(ox,oy,0,360,(int)((float)Rad/gamma),Rad);
/* Redraws axes */
line(1,oy,2*ox,oy);
line(ox,1,ox,2*oy);
}
setcolor(1);
settextstyle(DEFAULT_FONT,HORIZ_DIR,2);
outtextxy(10,20,"RELATIVISTIC TOP");
delay(100);
}
setcolor(1);
settextstyle(DEFAULT_FONT,HORIZ_DIR,1);
outtextxy(10,450,"Press a key to continue ....");
outtextxy(550,230,"x-axis");
outtextxy(340,20,"y-axis");
getch();
closegraph();
restorecrtmode();
return 0;
} Write, Run & Share C Language code online using OneCompiler's C online compiler for free. It's one of the robust, feature-rich online compilers for C language, running the latest C version which is C18. Getting started with the OneCompiler's C editor is really simple and pretty fast. The editor shows sample boilerplate code when you choose language as 'C' and start coding!
OneCompiler's C online editor supports stdin and users can give inputs to programs using the STDIN textbox under the I/O tab. Following is a sample C program which takes name as input and print your name with hello.
#include <stdio.h>
int main()
{
char name[50];
printf("Enter name:");
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return 0;
}
C language is one of the most popular general-purpose programming language developed by Dennis Ritchie at Bell laboratories for UNIX operating system. The initial release of C Language was in the year 1972. Most of the desktop operating systems are written in C Language.
When ever you want to perform a set of operations based on a condition if-else is used.
if(conditional-expression) {
// code
} else {
// code
}
You can also use if-else for nested Ifs and if-else-if ladder when multiple conditions are to be performed on a single variable.
Switch is an alternative to if-else-if ladder.
switch(conditional-expression) {
case value1:
// code
break; // optional
case value2:
// code
break; // optional
...
default:
// code to be executed when all the above cases are not matched;
}
For loop is used to iterate a set of statements based on a condition.
for(Initialization; Condition; Increment/decrement){
// code
}
While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.
while(condition) {
// code
}
Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.
do {
// code
} while (condition);
Array is a collection of similar data which is stored in continuous memory addresses. Array values can be fetched using index. Index starts from 0 to size-1.
data-type array-name[size];
data-type array-name[size][size];
Function is a sub-routine which contains set of statements. Usually functions are written when multiple calls are required to same set of statements which increases re-usuability and modularity.
Two types of functions are present in C
Library functions are the in-built functions which are declared in header files like printf(),scanf(),puts(),gets() etc.,
User defined functions are the ones which are written by the programmer based on the requirement.
return_type function_name(parameters);
function_name (parameters)
return_type function_name(parameters) {
//code
}