/*File : force2.c Calculate the peicewise time force. The formulas depend on wether time t is 0<=t<=3 or t>0*/
#include <stdio.h>
#define M 3

int main()
{

    double p, t;
    printf("Please input time in seconds: ");
    scanf("%lf",&t);
    if(0<=t && t<=M){
        p = 20;
        printf("Force p = %f (N)\n",p);
    }
    else if(t>3)
    {
        p = 4*(t+2);
        printf("Force p = %f (N)\n",p);
    }
    else
    {
        printf("Invalid input, time is never negitive\n");
    }
    return 0;
}