#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
#include <math.h>
#define ARG_NUM argc-1
#define PI_NUMBER 3.14
#define E_NUMBER 2.71

int main(int argc, char *argv[]) {
    int i, j;
    int k = 0;
    double result;
    double num[ARG_NUM];

    for (i = 1; i < argc; i++) {
        for (j = 0; j < strlen(argv[i]); j++) {
            if(!isdigit(argv[i][j])) {
                if (argv[i][j] == '+') {
                    result = num[k-2] + num[k-1];             //stack
                    num[k-2] = result;
                    k = k - 1;
          break;
                }
                if (argv[i][j] == '-') {
                    result = num[k-2] - num[k-1];
                    num[k-2] = result;
                    k = k - 1;
          break;
                }
                if (argv[i][j] == 'x') {
                    result = num[k-2] * num[k-1];
                    num[k-2] = result;
                    k = k - 1;
                    break;
                }
                if (argv[i][j] == '/') {
                    result = num[k-2] / num[k-1];
                    num[k-2] = result;
                    k = k - 1;
                    break;
                }
                if (argv[i][j] == 's' && argv[i][j+1] == 'i' && argv[i][j+2] == 'n') {
                    num[k-1] = sin(num[k-1]);
                    break;
                }
                if (argv[i][j] == 'c' && argv[i][j+1] == 'o' && argv[i][j+2] == 's') {
                    num[k-1] = cos(num[k-1]);
                    break;
                }
                if (argv[i][j] == 'p' && argv[i][j+1] == 'i') {
                    num[k-1] = PI_NUMBER;
                    break;
                }
                if (argv[i][j] == 'e') {
                    num[k-1] = E_NUMBER;
                    break;
                }
            }
        }
        if(j == strlen(argv[i])) {      //if parameter is a number and his length is equal to j, add it to the array num
      num[k++] = atoi(argv[i]);
        }
    }

    for (i = 0; i < k; i++) {         //writing a result
        printf("%f\t", num[i]);
    }

    return 0;
}