/*
* C program to do some calculations on mechanism forces
Please compile this on GNU C compiler with following command in terminal

gcc ./proj12.c -lm -o proj12.o

Note that -lm flag is for linking the Math libraries.
*/
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
//#define M_PI 3.14159265358979323846264338327

void main()
{
float a, b, c, root1, root2;
float th, thd, th_d, th_dd, m, r, rd, rdd, ar, ath, Fs, beta, N, Q;
printf("Enter theta in degrees:");
scanf("%f",&thd);
th=(M_PI/180)*thd;
printf("Enter theta dot in rad/sec:");
scanf("%f",&th_d);
printf("Enter theta double dot in rad/sec^2:");
scanf("%f",&th_dd);
printf("Enter mass value m:");
scanf("%f",&m);
r=-0.1*cos(th)+sqrt(0.01*pow(cos(th),2)+0.03);
rd=0.2*r*th_d*sin(th)/(2*r+0.2*cos(th));
rdd=(-2*pow(rd,2)+0.2*pow(th_d,2)*r*cos(th)+0.2*(r*th_dd+2*rd*th_d)*sin(th))/(2*r+0.2*cos(th));
ar=rdd-r*pow(th_d,2);
ath=r*th_dd+2*rd*th_d;
Fs=5000*(r-0.1);
beta=asin((r*sin(M_PI-th))/0.2);
N=(Fs+m*ar)/cos(th-beta);
Q=m*ath+N*sin(th-beta);
printf("For m=%4.2f, theta=%5.2fdeg, thd=%4.2frad/s and thdd=%4.2frad/sec^2, computed values are as follows.\n", m,thd,th_d,th_dd);
printf("\n Spring Force Fs=%5.2fN, Normal Force N=%5.2fN and Reaction Force Q=%5.2fN\n\n",Fs,N,Q);
}

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