/* File: accelvar.c 
   Calculate the acceleration using variables */
#include <stdio.h>

int main() {
    /* declare variables */
    double a,   /* acceleration */
           mu,  /* friction coefficient */
           m,   /* mass */
           p;   /* external force */

    /* initialize variables */
    mu = 0.2;
    m = 5.0;
    p = 20.0;

    /* calculate the acceleration */
    a = (p-mu*m*9.81)/m;

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