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Create smart calculator.

sadibekov (6)
Hello,
I need to create smart calculator.
For example, i need to find Sum of 7 and "three", compiler must write: 10.
Or "two" plus "two" are equal to 4;
I have code, but need to fix it

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#include <iostream>
#include <vector>

using namespace std;

vector<string> number_str = {"zero", "two", "three", "four", "five", "six", "seven", "eight", "nine"};

int get_number()
{
	string get_string;
	cin >> get_string;

	for (int i = 0; i < number_str.size(); i++)
	{
		if (get_string == number_str[i])
		{
			get_string = i;
		}
	}
}

int main()
{

	double a = 0;
	double b = 0; 
	char operation = ' ';

	cin >> a >> b >> operation;

	a = get_number();
	b = get_number();

	switch(operation) 
	{
	case '+': 
	cout << "Sum of " << a << " and " << b << ": " << a + b;
	break;
	case '-': 
	cout << "Difference between " << a << " and " << b << ": " << a - b;
	break;
	case '*':
	cout << "Multiplication of " << a << " and " << b << ": " << a * b; 
	break;
	case '/': 
	cout << "Division of " << a << " and " << b << ": " << a / b;
	break;
        default: cout << "Error in output stream";  
	}
}
lastchance (6980)
vector<string> number_str = {"zero", "two", "three", "four", "five", "six", "seven", "eight", "nine"};
What happened to "one"?



I should change
get_string = i;
to
return i;



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	cin >> a >> b >> operation;
	a = get_number();
	b = get_number();

Make your mind up! You input
a, then
b, then
an operation, then
a (again), then
b (again)




sadibekov (6)
I fixed it, but compiler give me: Erron in output stream
Last edited on
lastchance (6980)
sadibekov wrote:
I fixed it, but compiler give me: Erron in output stream

Mmmm, but we don't have access to your computer, so we can't see what you've done.

Please post your revised code BELOW this post.
sadibekov (6)
Sorry, 

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#include <iostream>
#include <vector>

using namespace std;

vector<string> number_str = {"zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine"};

int get_number()
{
	string get_string;
	cin >> get_string;

	for (int i = 0; i < number_str.size(); i++)
	{
		if (get_string == number_str[i])
		{
			return i;
		}
	}
}

int main()
{

	double a = get_number();
	double b = get_number(); 
	char operation = ' ';

	cin >> a >> b >> operation;

	switch(operation) 
	{
		case '+': 
			cout << "Sum of " << a << " and " << b << ": " << a + b;
			break;
		case '-': 
			cout << "Difference between " << a << " and " << b << ": " << a - b;
			break;
		case '*':
			 cout << "Multiplication of " << a << " and " << b << ": " << a * b; 
			break;
		case '/': 
			cout << "Division of " << a << " and " << b << ": " << a / b;
			break;
		default: cout << "Error in output stream";  
	}
}
lastchance (6980)
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	double a = get_number();
	double b = get_number(); 
	char operation = ' ';

	cin >> a >> b >> operation;


But now you've switched to:
input a, then
input b, then
set default operation, then
input a (again), then
input b (again), then
input operation




(Also, it would be useful to have a default return value - and probably a warning - if get_number receives a string not matching any of the legitimate choices.)
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