I have a task that I have to submit immediately.OK,here are the instructions.

Creating a programme for parabolic path/parabolic motion.

-The object is shot from the ground and there must be 4 input datas : the duration of time (t),the angle,initial velocity and the time interval of the displacement(delta t).

-The output should be the displacement in both the x and y direction.

- projection time is set to 0

- the position after t seconds is calculated by delta t second intervals(t and delta t is also input after the program runs).

- the result is output to the file, use Excel to make graph with it

I am having problems with writing the equations correctly and also with t and delta t

Here's what I have done so far.Someone correct me please.

Code:

#include <stdio.h>
#include <math.h>
#define g 9.8
int main()
{
double t, x, y, angle, Vo, deltat;
char buf[256];
int i;
FILE* fp;
printf( "t = " );
fgets( buf, 256, stdin );
sscanf( buf, "%lf\n", &t );
printf( "deltat = " );
fgets( buf, 256, stdin );
sscanf( buf, "%lf\n", &deltat );
printf("initial velocity = ");
sscanf( buf, "%lf\n", &Vo );
fgets( buf, 256, stdin );
printf( "angle = " );
sscanf( buf, "%lf\n", &angle );
fgets( buf, 256, stdin );
fp = fopen( "z:\\FreeFall.txt", "w" );
for( i = 0; i < t; 'i+=deltat' ) {
y = Vo*sin(angle)*deltat - ( g / 2.0 ) *deltat * deltat;
x = Vo*cos(angle)*deltat;
printf( "i= %f, y= %f ,x= %f\n", t, y, x );
fprintf( fp, "i=, %f, y=, %f ,x= %f\n", t, y, x );
}
fprintf( stderr, "File z:\\FreeFall.txt was created\n" );
fclose( fp );
return 0;
}

Here's the results.It came out endless and with weird results