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[calc.git] / calc.c

/* depend: */
/* cflags: */
/* linker: alloc.o argument.o debug.o element.o format.o parser.o program.o stack.o storage.o tabular.o workspace.o -lm -lreadline */

#include <malloc.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#include <readline/readline.h>
#include <readline/history.h>

#include "debug.h"
#include "element.h"
#include "format.h"
#include "parser.h"

/* constants */

#define BUFFER_SIZE 4096
#define HISTORY_LEN 10

/* macros */

#define CEIL(x, y) (((x) + (y) - 1) / (y))
#define MIN(x, y) (((x) < (y)) ? (x) : (y))
#define MAX(x, y) (((x) > (y)) ? (x) : (y))

/* gobal variables */

char *progname = NULL;
char *iprompt = "<= ";
int mode = 1;
char *oprompt = "=> ";
int precision = 6;
char **completion_list = NULL;

/* help function */

int usage (int ret)
{
    FILE *fid = ret ? stderr : stdout;
    fprintf (fid, "usage: %s\n", progname);
    fprintf (fid, " -h : help message\n");
    fprintf (fid, " -i : input prompt (%s)\n", iprompt);
    fprintf (fid, " -n : no readline mode (%s)\n", mode ? "yes" : "no");
    fprintf (fid, " -o : output prompt (%s)\n", oprompt);
    fprintf (fid, " -p : precision (%d)\n", precision);
    fprintf (fid, " -v : verbose level (%d)\n", verbose);

    return ret;
}

/* completion function */

char *generator (const char *text, int state);

char **completion (const char *text, __attribute__((unused)) int start, __attribute__((unused)) int end)
{
    rl_attempted_completion_over = 1;
    return rl_completion_matches (text, generator);
}

char *generator (const char *text, int state)
{
    static int index, len;
    char *name;

    if (!state) {
        index = 0;
        len = strlen(text);
    }

    while ((name = completion_list[index++])) {
        if (strncmp (name, text, len) == 0) {
            return strdup (name);
        }
    }

    return NULL;
}

/* main function */

int main (int argc, char *argv[])
{
    char *buffer = NULL;
    char buffer_static[BUFFER_SIZE + 1] = {0};
    int i = 0, nb = 1;
    int ret = 0;

    /* program name */

    progname = argv[0];
    while (progname[i] != '\0') {
        if ((progname[i] == '/') || (progname[i] == '\\')) {
            progname += i + 1;
            i = 0;
        } else {
            i++;
        }
    }

    /* argument processing */

     while (argc-- > 1) {
        char *arg = *(++argv);
        if (arg[0] != '-') {
            VERBOSE (ERROR, fprintf (stderr, "%s: invalid option -- '%s'\n", progname, arg); usage (1));
            return 1;
        }
        char c = arg[1];
        switch (c) {
        case 'n':
            mode = 0;
            buffer = buffer_static;
            break;
        case 'i':
            arg = (arg[2]) ? arg + 2 : (--argc > 0) ? *(++argv) : NULL;
            if (arg == NULL) {
                VERBOSE (ERROR, fprintf (stderr, "%s: missing input prompt\n", progname); usage (1));
                return 1;
            }
            iprompt = arg;
            break;
        case 'o':
            arg = (arg[2]) ? arg + 2 : (--argc > 0) ? *(++argv) : NULL;
            if (arg == NULL) {
                VERBOSE (ERROR, fprintf (stderr, "%s: missing output prompt\n", progname); usage (1));
                return 1;
            }
            oprompt = arg;
            break;
        case 'p':
            arg = (arg[2]) ? arg + 2 : (--argc > 0) ? *(++argv) : NULL;
            if (arg == NULL) {
                VERBOSE (ERROR, fprintf (stderr, "%s: missing precision\n", progname); usage (1));
                return 1;
            }
            precision = atoi (arg);
            break;
        case 'v':
            arg = (arg[2]) ? arg + 2 : (--argc > 0) ? *(++argv) : NULL;
            if (arg == NULL) {
                VERBOSE (ERROR, fprintf (stderr, "%s: missing verbose level\n", progname); usage (1));
                return 1;
            }
            verbose = atoi (arg);
            break;
        case 'h':
        default:
            return usage (c != 'h');
        }
    }

    /* set format */
    set_format (oprompt, precision);

    /* completion list*/
    completion_list = generate_completion_list ();
    rl_attempted_completion_function = completion;

    /* read from input stream */

    while (1) {
        char *line[BUFFER_SIZE] = {0};

        if (mode) {
            if ((buffer = readline (iprompt)) == NULL) {
                break;
            }

            /* check empty line */
            if (strlen (buffer) == 0) {
                free (buffer);
                continue;
            } else if (strcmp (buffer, ".") == 0) {
                free (buffer);
                break;
            }

            /* add line into history */
            add_history (buffer);
            VERBOSE (INFO, fprintf (stdout, "line (%d/%d): '%s'\n",
                                    where_history (), history_length, buffer));
            if (history_length > HISTORY_LEN) {
                HIST_ENTRY *last = remove_history (0);
                if (last) {
                    free_history_entry (last);
                }
            }
        } else {
            printf ("%s", iprompt);
            if (read (STDIN_FILENO, buffer, BUFFER_SIZE) == 0) {
                break;
            }
            VERBOSE (INFO, fprintf (stdout, "line: '%s'\n", buffer));
        }

        /* pre-process buffer */
        nb = 0;
        char *pt = line[nb++] = buffer;
        while (*pt != '\0') {
            switch (*pt) {
            case '\n':
                *pt = '\0';
                // fallthrough
            case ';':
                line[nb++] = pt + 1;
            }
            pt++;
        }

        /* look for end of line */
        for (i = 0; i < nb; i++) {
            if (*line[i] == '\0') {
                continue;
            }
            element_t *element = parser (line[i], NULL, -9);
            if (element == ERROR_OP) {
                VERBOSE (WARNING, fprintf (stdout, "error while parsing: '%s'\n", line[i]));
                ret = 1;
            } else if (element != NULL) {
                VERBOSE (INFO, print_element (element, 0));
                answer = evaluate_element (element, 0);
                if (!element->hidden) {
                    print (answer);
                }
                delelement (element);
                ret = 0;
            }
        }

        if (mode) {
            free (buffer);
        } else {
            memset (buffer, 0, BUFFER_SIZE);
        }
    }

    free_completion_list (completion_list);

    free_format ();

    return ret;
}

// test: calc.exe -h
// test: calc.exe -h | awk '/usage:/ { rc=1 } END { exit (1-rc) }'
// test: echo 1 | calc.exe -v3 | grep -q value
// test: calc.exe -_ 2> /dev/null | awk 'END { if (NR == 0) { exit(0) } else exit (1) }'
// test: calc.exe -_ 2>&1 | awk '/usage:/ { rc=1 } END { exit (1-rc) }'
// test: calc.exe error 2>&1 | grep -q 'invalid option'
// test: calc.exe -i 2>&1 | grep -q 'missing input prompt'
// test: calc.exe -o 2>&1 | grep -q 'missing output prompt'
// test: calc.exe -p 2>&1 | grep -q 'missing precision'
// test: calc.exe -v 2>&1 | grep -q 'missing verbose'
// test: echo "1 + 1" | calc.exe -i '# ' | grep -q '# 1 + 1'
// test: echo "1 + 1" | calc.exe -o '# ' | grep -q '# 2'
// test: echo "1 + 2" | calc.exe | grep -q '=> 3'
// test: echo "1 - 2" | calc.exe | grep -q '=> -1'
// test: echo "2 * 3" | calc.exe | grep -q '=> 6'
// test: echo "1 / 2" | calc.exe | grep -q '=> 0\.5'
// test: echo "8 % 3" | calc.exe | grep -q '=> 2'
// test: echo "-9 % 3.1" | calc.exe | grep -q '=> -2\.8'
// test: echo "2 ^ 3" | calc.exe | grep -q '=> 8'
// test: echo "1e-1 + 2.34e3" | calc.exe | grep -q '=> 2340\.1'
// test: echo "sqrt (2)" | calc.exe | grep -q '=> 1\.41421'
// test: echo "pow (2, 3)" | calc.exe | grep -q '=> 8'
// test: echo "cos (2)" | calc.exe | grep -q '=> -0\.416147'
// test: echo "sin (2)" | calc.exe | grep -q '=> 0\.909297'
// test: echo "atan (2)" | calc.exe | grep -q '=> 1\.10715'
// test: echo "exp (2)" | calc.exe | grep -q '=> 7\.38906'
// test: echo "ln (2)" | calc.exe | grep -q '=> 0\.693147'
// test: echo "log (10)" | calc.exe | grep -q '=> 1'
// test: echo "2 + 3 - 4" | calc.exe | grep -q '=> 1'
// test: echo "1 + cos (2 - 3)" | calc.exe | grep -q '=> 1\.5403'
// test: echo "cos (1 / 2) * 3" | calc.exe | grep -q '=> 2\.63275'
// test: echo "1 + 4 * (2 - 3)" | calc.exe | grep -q '=> -3'
// test: echo "(2 - 3) / 4" | calc.exe | grep -q '=> -0\.25'
// test: echo "pow (8 - 3, 4 / 3)" | calc.exe | grep -q '=> 8\.54988'
// test: echo "1 + -2" | calc.exe | grep -q '=> -1'
// test: echo "1 - +2" | calc.exe | grep -q '=> -1'
// test: echo "-1 + +2" | calc.exe | grep -q '=> 1'
// test: echo "-1+2" | calc.exe | grep -q '=> 1'
// test: echo "1-2" | calc.exe | grep -q '=> -1'
// test: echo "1 * 2 / 3 + 4" | calc.exe | grep -q '=> 4\.66667'
// test: echo "2 ^ 3 * 4 + 5" | calc.exe | grep -q '=> 37'
// test: echo "2 + 3 * 4 ^ 5" | calc.exe | grep -q '=> 3074'
// test: echo "2 ^ 3 * 4 + cos(5/6)" | calc.exe | grep -q '=> 32\.6724'
// test: echo "95-6.3*15-1" | calc.exe | grep -q '=> -0.5'
// test: echo "95 - 6.3 * 15 - 1" | calc.exe | grep -q '=> -0\.5'
// test: echo "95-6.3+15" | calc.exe | grep -q '=> 103.7'
// test: echo "-cos (0) + 1" | calc.exe | grep -q '=> -0'
// test: echo "-cos(0)+1" | calc.exe | grep -q '=> -0'
// test: echo "quit" | calc.exe | grep -q 'bye'
// test: echo "help" | calc.exe | grep -q 'miscellaneous'
// test: echo "1 + 2 *" | calc.exe | grep -q 'error'
// test: echo "* 1 - 2" | calc.exe | grep -q 'error'
// test: echo "2 + * 3" | calc.exe | grep -q 'error'
// test: echo "2 + cos(3 *)" | calc.exe | grep -q 'error'
// test: echo "2 + (foo)" | calc.exe | grep -q 'error'
// test: echo "2 + cos (pi +" | calc.exe | grep -q 'error'
// test: echo "2 + cos (pi" | calc.exe | grep -q 'error'
// test: echo "(2 + " | calc.exe | grep -q 'error'
// test: echo "cos (1, 2)" | calc.exe | grep -q 'error'
// test: echo "sqrt 2" | calc.exe | grep -q 'error'
// test: echo "pow (2)" | calc.exe | grep -q 'error'
// test: echo "1.23456789" | calc.exe -p 4 | grep -q '=> 1\.235'
// test: echo . | calc.exe | grep -qv error
// test: echo -e '1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1\n1 + 1' | calc.exe -n | grep -q 64
// test: echo -e '1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1\n1 + 1' | calc.exe -n | grep -q 2
// test: echo -e '1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1\n1 + 1' | calc.exe | grep -q 64
// test: echo -e '1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1\n1 + 1' | calc.exe | grep -q 2
// test: echo -e '-cos (1)\n1 + 1\n1 - 1\n1 * 1\n1 / 1\n3%2\n2^2\nsqrt (2)\ncos (0)\nsin (0)\ntan (0)\nacos (0)\nasin (0)\natan (0)\nln (1)\nlog (1)\nexp (1)\nabs (-1)\nceil (1.2)\nfloor (-1.2)\nans\ne\npi\nsto (1)\nrcl (2)\ndisp\nhelp\nquit' | calc.exe -n -v 3 | grep -q bye
// test: echo -e '1 +\n1 -\n1 * 1\n1 /\n3%\n2^\nsqrt ()\ncos ()\nsin ()\ntan ()\nacos ()\nasin ()\natan ()\nln ()\nlog ()\nexp ()\nabs ()\nceil ()\nfloor ()\n1 + (\n1+2(\n1+2cos\n1+2pi' | calc.exe | grep -c error | xargs test 22 =
// test: echo -e '1 + 1\nans' | calc.exe -p 3 | grep -c 2 | xargs test 2 =
// test: echo -e 'sin (pi / 2)' | calc.exe -p 4 | grep -q 1
// test: echo -e 'e ^ 2' | calc.exe | grep -q '7\.38906'
// test: echo -e '\n\n\n' | calc.exe | grep -qv 'error'
// test: echo -e '\n\n\n' | calc.exe -n | grep -qv 'error'
// test: echo -e '1.5\nsto (2)\n3 + rcl(2) * 4\nsto (5)' | calc.exe | grep -q 9
// test: echo -e '1\nsto (0)\nsto (11)\nrcl (0)\nrcl (11)' | calc.exe | grep -c error | xargs test 4 =
// test: echo -e '1\nsto (2)\n3\nsto (5, 7)\nsto(9)\ndisp' | calc.exe | grep -q '0 1 0 0 7 0 0 0 7 0'
// test: echo -e '1+1 == 2' | calc.exe | grep -q '=> 1'
// test: echo -e '1 + 1 == 2 - 0' | calc.exe | grep -q '=> 1'
// test: echo -e '1 == 1 + 1 == 1' | calc.exe | grep -q '=> 0'
// test: echo -e '1-cos(3*pi/4) != 0.5^-2' | calc.exe | grep -q '=> 1'
// test: echo -e '1 >= 2' | calc.exe | grep -q '=> 0'
// test: echo -e '2 >= 2' | calc.exe | grep -q '=> 1'
// test: echo -e '1 <= 2' | calc.exe | grep -q '=> 1'
// test: echo -e '2 <= 2' | calc.exe | grep -q '=> 1'
// test: echo -e '1 > 2' | calc.exe | grep -q '=> 0'
// test: echo -e '2 > 2' | calc.exe | grep -q '=> 0'
// test: echo -e '1 < 2' | calc.exe | grep -q '=> 1'
// test: echo -e '2 < 2' | calc.exe | grep -q '=> 0'
// test: echo -e '1 == 1\n1 != 1\n1 >= 1\n1 <= 1\n1 > 1\n1 < 1\nquit' | calc.exe -v 3 | grep -q bye
// test: echo -e '(3 == 3) & (2 > 1)' | calc.exe | grep -q '=> 1'
// test: echo -e '(3 == 4) & (2 > 1)' | calc.exe | grep -q '=> 0'
// test: echo -e '(3 == 3) & (2 > 2)' | calc.exe | grep -q '=> 0'
// test: echo -e '(3 == 4) & (2 > 2)' | calc.exe | grep -q '=> 0'
// test: echo -e '(3 == 3) | (2 > 1)' | calc.exe | grep -q '=> 1'
// test: echo -e '(3 == 4) | (2 > 1)' | calc.exe | grep -q '=> 1'
// test: echo -e '(3 == 3) | (2 > 2)' | calc.exe | grep -q '=> 1'
// test: echo -e '(3 == 4) | (2 > 2)' | calc.exe | grep -q '=> 0'
// test: echo -e '!(3 == 4)' | calc.exe | grep -q '=> 1'
// test: echo -e '!(3 == 3)' | calc.exe | grep -q '=> 0'
// test: echo -e '1 & 1\n1 | 1\n!1\nquit' | calc.exe -n -v 3 | grep -qv error
// test: echo -e '(3 == 3) & (4 > 2)' | calc.exe | grep -q '=> 1'
// test: echo -e '3 == 3 & 4 > 2' | calc.exe | grep -q '=> 1'
// test: echo -e '1 + quit' | calc.exe | grep -q error
// test: echo -e 'cos (quit)' | calc.exe | grep -q error
// test: echo -e '(quit)' | calc.exe | grep -q error
// test: echo -e 'cos 3.14\n!\n! 3 4' | calc.exe | grep -c error | xargs test 3 =
// test: echo -e 'sto (2, 3)\ncond (rcl (2) > 2, ln (64), exp (75 / 10))' | calc.exe  | grep -q '=> 4\.15888'
// test: echo -e 'sto (2, 1)\ncond (rcl (2) > 2, ln (64), exp (75 / 10))' | calc.exe  | grep -q '=> 1808\.04'
// test: echo -e 'sto (2, 1)\ncond (rcl (2) > 2, ln (64))' | calc.exe  | grep -q '=> 0'
// test: echo -e 'cond (0, 1, 2)\nquit' | calc.exe -v 3 | grep -q Cond
// test: echo -e 'cond\ncond (\ncond (1 >0,'| calc.exe | grep -c error | xargs test 3 =
// test: echo -e 'sto (1, 4)\ninc (1)\ninc (1)\ndec (1)\ninc (1)\nrcl (1) == 6\nquit' | calc.exe -v 3 | grep -q '=> 1'
// test: echo -e 'inc\ninc (\ndec\ndec (' | calc.exe | grep -c error | xargs test 4 =
// test: echo -e 'inc (11)\ndec (0)' | calc.exe | grep -c error | xargs test 2 =
// test: echo -e 'while (inc (1) < 100, sto (2, rcl (1) + rcl (2)))' | calc.exe | grep -q '=> 4950'
// test: echo -e 'while\nwhile (inc (1) < 3,\nwhile (inc (1) < 100, sto (2, rcl (1) + rcl (2))' | calc.exe | grep -c error | xargs test 3 =
// test: echo -e 'while (0, 1)\nquit' | calc.exe -v 3 | grep -q While
// test: echo -e '{sto (1, 1 + 1), rcl (1) * 3}\nquit' | calc.exe -v 3 | grep -q 'Code'
// test: echo -e '{sto (1, 1 + 1), rcl (1) * 3}' | calc.exe | grep -q '=> 6'
// test: echo -e '{\n{}\n{1, 2\n{sto (1, 1 + 1),\npow(2, {sto (1, 1 + 2), 2}, {rcl(2)})\n2 {sto (1, 1 + 1)}' | calc.exe | grep -c error | xargs test 6 =
// test: echo -e '1 }\n1 )\n1 , 2\n ' | calc.exe | grep -c error | xargs test 3 =
// test: echo -e 'print (1)\nquit' | calc.exe -v 3 | grep -q Print
// test: echo -e 'si\t\t (pi / 2)' | calc.exe | grep -q '=> 1'
// test: echo -e '\t\t' | calc.exe | grep -q 'print'
// test: echo -e '1 + 1;\nans + 1' | calc.exe | grep -qv 2
// test: echo -e 'mem (3)\nsto (4, pi)' | calc.exe | grep -q error
// test: echo -e 'sto (2, 3)\nmem (2)\ndisp' | calc.exe | grep -q 'storage: 0 3$'
// test: echo -e 'disp' | calc.exe | grep -q "storage: 0 0 0 0 0 0 0 0 0 0"
// test: echo -e 'sto (3, 10)\ndisp' | calc.exe | grep -q "storage: 0 0 10 0 0 0 0 0 0 0"
// test: echo -e 'rcl (3)\ndisp' | calc.exe | grep -q "storage: 0 0 0 0 0 0 0 0 0 0"
// test: echo -e 'inc (2)\ndisp' | calc.exe | grep -q "storage: 0 1 0 0 0 0 0 0 0 0"
// test: echo -e 'dec (2)\ndisp' | calc.exe | grep -q "storage: 0 -1 0 0 0 0 0 0 0 0"
// test: echo -e 'clr\nsto (3, pi)\nclr\ndisp' | calc.exe | grep -q "storage: 0 0 0 0 0 0 0 0 0 0"
// test: echo -e 'mem (3)\nclr\nquit' | calc.exe -v 3 | grep -q Clear
// test: echo -e 'prog (2, {arg (2) - arg (1)})\nprog (1, {cos (arg (1)^2)})\ncall (1, pi/6)\nprog (2, {arg (1) * 3})\ncall (2, 1, 2)\nls' | calc.exe | grep -q 'programs: 2 1'
// test: echo -e 'prog (1, {arg (2) - arg (1)})\ncall (1, 2, 3)\nls\nedit (1)\nprog (1, {arg (2) + arg (1)})\nedit (1)\ndel (1)\nquit' | calc.exe -v 3 | grep -q bye
// test: echo -e 'prog (2, {arg (2) - arg (1)})\nprog (3, cos(arg (1) * pi / 3))\ncall (1, 2, 3)\ncall (2, 1)\nls\nedit (1)\ndel (1)\ndel (3)\ndel (2)\ncall (2, 1, 4)' | calc.exe | grep -c error | xargs test 5 =
// test: echo -e 'prog (2, {arg (2) - arg (1)})\nprog (3, cos(arg (1) * pi / 3))\ndel (2)\ndel (3)\nls' | calc.exe | grep -q '^programs:$'
// test: echo -e 'erf (1)\nerfc (1)\nquit' | calc.exe -v 3 | grep -q bye
// test: echo -e 'erf ()\nerfc ()' | calc.exe | grep -c error | xargs test 2 =
// test: echo -e 'set (1, 2, 3, 3.11, pi, 4)\nget (4)' | calc.exe | grep -q '=> 3.11'
// test: echo -e 'set (1, 2, 3, 3.11, pi, 4)\npop\npop\n5\npush\nshow' | calc.exe | grep -q 'stack: 1 2 3 3.11 5'
// test: echo -e 'set (1, 2, 3, 3.11, pi, 4)\nset\nput (3, 4)\nshow' | calc.exe | grep -q 'stack: 0 0 4'
// test: echo -e 'set (0, -1)\nset (1, 2, 3, 3.11, pi, 4)\nlen' | calc.exe | grep -q '=> 6'
// test: echo -e 'set (1, 2)\npop\npush (3)\nput (5, -1)\nlen\nshow\nget (3)\nquit' | calc.exe -n -v 3 | grep -q bye
// test: echo -e 'put\nget\nget (1)\npop\nput (0)' | calc.exe | grep -c 'error' | xargs test 5 =
// test: echo -e 'push (2)' | calc.exe | grep -q '=> 2'
// test: echo -e 'prog (1, {set (1, 2), push (arg (1)), show})\ncall (1, 10)\nprog (1, {mem (1), sto (1, cos (arg (1)))})\ncall (1, pi / 2)\ndel (1)' | calc.exe -n | grep -q 'stack: 1 2 10'
// test: echo -e 'prog (1, {set (1, 2), push (arg (1)), show});\ncall (1, 10);\nshow\ndel (1)' | calc.exe -n | grep -q 'stack:$'
// test: echo -e 'prog (1, {set (1, 2), push (arg (1)), show});\ncall (1, 10);\nlen' | calc.exe -n | grep -q '=> 0'
// test: echo -e 'prog (1, {mem (2), sto (1, arg (1) - rcl (1) / 2)})\ncall (1, 1)\ncall (1, 2)\ncall (1, 3)\nprog (1, {mem (2), sto (2, rcl (1)), sto (1, arg (1)), rcl (2)})\ncall (1, 10)' | calc.exe -n | grep -q '=> 2.25'
// test: echo -e 'set (1, 2, -5, 6, -8, 9, -2, 23, 4)\nord\nshow' | calc.exe | grep -q 'stack: -8 -5 -2 1 2 4 6 9 23'
// test: echo -e 'set (1, 2, -5, 6, -8, 9, -2, 23, 4)\nmin (5, -3)\nmax (-1)\nmean (1, 2)\nvar (1, 2)\nmin\nmean\nmed\nmax\nprod\nsum\nvar' | calc.exe | awk 'BEGIN { split("9 -3 -1 1.5 0.5 -8 3.33333 2 23 -794880 30 73.3333", v) } /=>/ { for (i in v) if ($2 == v[i]) n++ } END { exit n != 12 }'
// test: echo -e 'set (1, 2, -5, 6, -8, 9, -2, 23, 4)\nmin (5, -3)\nmax (-1)\nmin\nmean\nmed\nmax\nord\nprod\nsum\nvar\nquit' | calc.exe -n -v 3 | grep -q bye
// test: echo -e 'min\nmean\nmed\nmax\nprod\nsum\nvar\nord\nset (1)\nord' | calc.exe -n | grep -c error | xargs test 9 =
// test: echo -e 'prog (1, cos(pi * arg (1))) / 4' | calc.exe | grep -c error | xargs test 1 = 
// Gauss sequence
// test: echo -e '{sto (1, 0), sto (10, 0), while (inc (10) <= 100, {sto (1, rcl (1) + rcl (10)), print (rcl (1))})};' | calc.exe | grep -q '=> 5050'

// Fibonacci sequence
// test: echo -e '{sto (1, 1), sto (2, 1), sto (10, 1), while (inc (10) <= 12 - 1, {sto (3, rcl (1) + rcl (2)), sto (1, rcl (2)), print (sto (2, rcl (3)))})};' | calc.exe | grep -q '=> 144'

// Gold number
// test: echo -e '{sto (1, 1), sto (2, 1), sto (10, 1), while (inc (10) < 15 - 1, {sto (3, rcl (1) + rcl (2)), sto (1, rcl (2)), print (sto (2, rcl (3)) / rcl (1))})};' | calc.exe | grep -q '=> 1.61803'

// Factorial sequence
// test: echo -e 'prog (1, cond (arg (1) > 1, arg (1) * call (1, arg (1) - 1), 1))\ncall (1, 10)' | calc.exe | grep -q '=> 3.6288e+06'

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