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- // lab5.cpp: определяет точку входа для консольного приложения.
- //
- #include "stdafx.h"
- #include <string>
- #include <iostream>
- #include <conio.h>
- #include <stack>
- #include <vector>
- #include <cmath>
- using namespace std;
- int get_priority(char a) {
- char const p[5][2] = { {'(', ')'}, {'+', '-'}, {'*', '/'}, {'{', '}'}, '^' };
- for (int i = 0; i <= 5; i++)
- for (int j = 0; j <= 1; j++) {
- if (a == p[i][j])
- return i;
- }
- }
- int _tmain(int argc, _TCHAR* argv[])
- {
- stack<char> stack_chr;
- int correct = 1;
- string s_in = "a+cos(c+(sin(a)+b)+c)+a", s_post;
- while (s_in.find("sin") != -1)
- s_in.replace(s_in.find("sin"), 3, "{");
- while (s_in.find("cos") != -1)
- s_in.replace(s_in.find("cos"), 3, "}");
- vector<double> v = { 1, 1, 1 };
- for (int i = 0; i < s_in.length(); i++) {
- if (int(s_in[i]) >= 97 && int(s_in[i]) <= 122) {
- s_post.push_back(s_in[i]);
- continue;
- }
- switch (s_in[i]) {
- case '(':
- stack_chr.push('('); break;
- case ')': {
- while (stack_chr.top() != '(') {
- s_post.push_back(stack_chr.top());
- stack_chr.pop();
- }
- stack_chr.pop();
- if (!stack_chr.empty()) {
- if (stack_chr.top() == '{' || stack_chr.top() == '}') {
- s_post.push_back(stack_chr.top());
- stack_chr.pop();
- }
- }
- break;
- }
- default: {
- if (!stack_chr.empty()) {
- char chr = s_in[i];
- if (chr == '+' || chr == '-' || chr == '*' || chr == '/' || chr == '{' || chr == '}' || chr == '^') {
- while (get_priority(stack_chr.top()) >= get_priority(chr)) {
- s_post.push_back(stack_chr.top());
- stack_chr.pop();
- if (stack_chr.empty())
- break;
- }
- }
- }
- stack_chr.push(s_in[i]); break;
- }
- }
- }
- while (!stack_chr.empty()) {
- if (stack_chr.top() == '(' || stack_chr.top() == ')') {
- correct = 0;
- break;
- }
- s_post.push_back(stack_chr.top());
- stack_chr.pop();
- }
- correct ? cout << s_in << endl << s_post << endl : cout << "скобки не согласованы" << endl;
- stack<double> stack_dbl;
- for (int i = 0; i < s_post.length(); i++) {
- if (int(s_post[i]) >= 97 && int(s_post[i]) <= 122) {
- stack_dbl.push(v[int(s_post[i])-97]);
- continue;
- }
- double op1, op2;
- if (s_post[i] == '{' || s_post[i] == '}') {
- op1 = stack_dbl.top();
- stack_dbl.pop();
- s_post[i] == '{' ? stack_dbl.push(sin(op1)) : stack_dbl.push(cos(op1));
- }
- else {
- op2 = stack_dbl.top();
- stack_dbl.pop();
- op1 = stack_dbl.top();
- stack_dbl.pop();
- switch (s_post[i]) {
- case '+':
- stack_dbl.push(op1 + op2); break;
- case '-':
- stack_dbl.push(op1 - op2); break;
- case '*':
- stack_dbl.push(op1 * op2); break;
- case '/':
- stack_dbl.push(op1 / op2); break;
- case '^':
- stack_dbl.push(pow(op1, op2)); break;
- }
- }
- }
- cout.precision(4);
- cout << stack_dbl.top() << endl;
- _getch();
- return 0;
- }
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