#include <stdio.h>
#include <stdlib.h> /* for atof() */
#include <math.h> /* for atof() */
#include "calc.h"


#ifndef M_PI
#define M_PI	3.14159265358979323846
#endif
#ifndef M_E
#define M_E	2.718281828459045235360287
#endif



#define MAXOP 100 /* max size of operand or operator */

static int dostr( int type, char *s);

void help()
{
	fprintf(stderr,"\n+,*,-,/,h,;=top to console\n");
	fprintf(stderr,"e=power: p =pop to console\n");
	fprintf(stderr,"s sin, c cos, t tan\n");
	fprintf(stderr,"S asin, C acos, T atan, q quit\n");
	fprintf(stderr,"N clear stack,V print stack\n");
	fprintf(stderr,"E=push exp1, P= push PI\n\n");
	fprintf(stderr,"Example: sen(sqrt(3*3+1)*3.5*PI/2) =\n");
	fprintf(stderr,"         3 3 x 1 + 0.5 e 3.5 P x x 2 / s p\n");
}


/* reverse Polish calculator */

int main( int argc, char **argv)
{
	int		i=0;
	int		type=0;
	char	s[MAXOP];

	if ( argc==1 )
	{
		while ((type = getop(s)) != EOF)
		{
			dostr ( type, s );
		}
	}
	else
	{
		while ( ++i < argc )
		{
			dostr ( sgetop(argv[i]), argv[i] ); 
		}
	}
	return 0;
}

static int dostr( int type, char *s)
{
	double	op2;

	switch (type)
	{
	
		case NUMBER:
			push(atof(s));
			break;
		
		case '+':
			push(pop() + pop());
			break;
		case '*':
		case 'x':
			push(pop() * pop());
			break;
		case '-':
			op2 = pop ( );
			push(pop() - op2);
			break;
		case '/':
			op2 = pop();
			if (op2 != 0.0)
				push(pop() / op2);
			else
				fprintf(stderr, "error: divisor is zero\n");
			break;
		case 'e':
			op2 = pop();
			push(pow(pop() , op2));
			break;
 
		
		case 's':
			push(sin(pop()));
			break;
		case 'c':
			push(cos(pop()));
			break;
		case 't':
			push(tan(pop()));
			break;
		case 'T':
			push(atan(pop()));
			break;
		case 'C':
			push(acos(pop()));
			break;
		case 'S':
			push(asin(pop()));
			break;
 
		case 'E':
			push(M_E);
			break;
		case 'P':
			push(M_PI);
			break;
		
		case 'v':
		case ';':
			op2=pop();push(op2);
			printf(FORMATO_FL, op2);
			break;

		case 'V':
			PrintStack();
			break;
			
		case 'p':
			printf(FORMATO_FL, pop());
			break;

		case 'N':
			ClearStack();
			break;
			
			

		case 'h':
			help();
			break;
		case '\n':
			break;
		case 'q':
			exit(0);
			break;

		default:
			fprintf(stderr, "error: unknown command \"%s\"\n", s);
			break;
		}

	return 0;
}