/* File: accelio.c
   Interactively calculate the acceleration based on the mass,
   friction coefficient, and time from the terminal */
#include <stdio.h>
#define M_G   9.81  /* gravitational acceleration constant g */

int main() {
    /* declare variables */
    double a, mu, m, p, t;

    /* prompt the user for input of m, mu, and t */
    printf("***** Acceleration Calculator *****\n\n");
    printf("Please enter value for mass in kilogram\n"); 
    scanf("%lf", &m);
    printf("mass is %lf (kg)\n\n", m);
    printf("Please enter value for friction coefficient\n"); 
    scanf("%lf", &mu);
    printf("friction coefficient is %lf\n\n", mu);
    printf("Please enter value for time in second\n"); 
    scanf("%lf", &t);
    printf("time is %lf (s)\n\n", t);
 
    /* calculate the acceleration based on the user input */
    p = 4*(t-3)+20;
    a = (p-mu*m*M_G)/m;

    /* display output */
    printf("Acceleration a = %f (m/s^2)\n", a);
    return 0;
}