/*
 * strings.cpp
 *
 *  Created on: 15.11.2012
 *      Author: trifon
 */




#include <iostream>
#include <cstring>
using namespace std;

const int MAX = 100;

int main1()
{
	char s[] = "Hello, world!";
	cout << s << endl;
	cout << strlen(s) << endl;
	cout << s[strlen(s)-1] << endl;

	char s2[15] = ""; // <-> { '\0' } <-> { 0 }
	char s3[15] = "";
	// cin >> s2;
	cin.getline(s2, 15);
	cout << "->" << s2 << "<-" << endl;
	//cin >> s3;
	cin.getline(s3, 15);
	cout << "->" << s3 << "<-" << endl;
	return 0;
}

int main2()
{
	char a[5] = { 'H', 'e', 'l', 'l', 'o' };
	char s[20] = "Hello, world!";
	strcpy(s, "Goodbye, world!");
	cout << s << endl;
	char s2[20] = "";
	strcpy(s2, "Hello, world!");
	// s2 = s;
	cout << s2 << endl;
//!!!	cout << strcpy(s, ";lkdfj;fjjadsfjladsfjkldfjdsjfkldfj") << endl;
//	cout << s2 << endl;
	cout << strcmp(s, s2) << endl;
//	strcpy(s2, s);
	if (strcmp(s, s2) == 0)
	{
		cout << "s == s2!" << endl;
	}
	if (strcmp(s, s2) != 0)
	{
		cout << "s != s2!" << endl;
	}
	cout << strcat(s, "?!") << endl;
	// !!!! strcat("abc", "def");
	// !!! "e" != 'e'
	cout << strchr("abcdefg", 'e') << endl;
	cout << strstr("abcdefg", "bcd") << endl;

	cout << strlen(a) << endl;
	cout << a << endl;

	strncpy(s, "Hello, world!", 7);
	s[7] = '\0';

	strncat(s, " I am here!", 5);
	cout << s << endl;

	cout << strncmp("Hello, nice world!", "Hello, cruel world!", 8);
	cout << endl;
}

int main3()
{
	char s[MAX] = "";
	cout << "Въведете низ на латиница: ";
	cin.getline(s, MAX);

	int n = strlen(s);
	int i = 0;
	while (i < n / 2 && s[i] == s[n-1-i])
		i++;
	// i == n / 2 || s[i] != s[n-1-i]
	cout << "Низът \"" << s << "\"";
	if (i < n / 2)
		cout << " НЕ";
	cout << " е палиндром" << endl;
}

int main4()
{
	char s[MAX] = "";
	cout << "Въведете низ: ";
	cin.getline(s, MAX);

	// думите се разделят с ' ', ',', '.', '!', '?'
	int n = strlen(s);
	int count = 0;
	bool word = false;
	for(int i = 0; i < n; i++)
	{
		bool mark = s[i] == ' ' || s[i] == ',' || s[i] == '.';
		mark = mark || s[i] == '!' || s[i] == '?';

		if (word && mark)
			word = false;
		if (!word && !mark)
		{
			word = true;
			count++;
		}
	}
	cout << "Низът съдържа " << count << " думи" << endl;
}

int main()
{
	// 1+3+5/7-4*2
	char s[MAX];
	cin.getline(s, MAX);
	int result = 0;char op = '+';
	for(int i = 0; s[i] != '\0'; i++)
	{
		if (s[i] >= '0' && s[i] <= '9')
		{
			int d = s[i] - '0';
			switch (op)
			{
			case '+':result += d;break;
			case '-':result -= d;break;
			case '*':result *= d;break;
			case '/':result /= d;break;
			}
		} else
			op = s[i];
	}
	cout << "=" << result << endl;
}