#include <stdio.h>
#define g -9.8

/*****************************************************

Program C13.c, written by C.S. Thaxton
Last modified: 8/25/04, 10:00am

This program computes the final velocity of a falling
object given the initial velocity and a final time of
interest

user-prompted input:
        initial time
        initial velocity
        final time of interest

output:
        final velocity (to the screen)

variables:
        t_init - initial time [s] (hardcoded to 0)
        t_final - final time [s]
        v_init - initial velocity [m/s]
        v_final - final velocity [m/s]
        g - gravitational acceleration [m/s/s] (#define)
        again - character prompt (control)

dependencies:
        stdio.h        

*****************************************************/
        
int main()
//use int main() only with return INT; at end
{

// Messages for initial display

  char message1[100]="Free Fall Final Velocity Computation\n";
  char message2[100]="C.S.Thaxton\n";
  char again='y';  // Loop control

// Define variables as float (accuracy not an issue)

  float t_init=0.0;  // HARDCODE t-init to 0
  float t_final, v_init, v_final;

// Loop through to allow for multiple computations

  printf("%s",message1);
  printf("%s",message2);
  
  while (again=='y') {

// Prompt user for input

    printf("\nPlease enter the initial velocity [m/s]: ");
    scanf("%f",&v_init);
    printf("\nPlease enter the final time [s]: ");
    scanf("%f",&t_final);    

// Compute final velocity

    v_final=v_init+g*(t_final-t_init);

// Print final result

    printf("\nThe final velocity is [m/s]: %f",v_final);

// Prompt for loop

    printf("\n\nWould you like to do another [y/n]: ");
    scanf("%s",&again);
  }

// Terminate


  return(0);
}