Translating input

[fidelcashflo]

Hi there, I am new to C++, and was wondering if someone could write an example program for me to work with.

What I would like to do is take input from stdin and then display the translate output to stdout.

Example:

Input:

(color 0 0 0.1) // These numbers can be any floating point numbers.
                // And there will always be parentheses. 

Output:

0 0 0.1 setrgbcolor

I think learning how to do this will be enough to get me on my way.

Any help will be greatly appreciated.

[Stewbond]

I'm assuming color is only one possible command and that you want to leave contingency for others.

First get the line

std::string Line;
getline(cin,Line)

Then delete the last parenthesis:

for (int i=0; i < Line.length(); i++)
    if (Line[i] == ')')  Line[i] == '\0');

Now put the line into a string stream:

std::stringstream iss;
iss << Line;

Now extract the outputs:

float R, G, B;
std::string command;
iss >> command;
if (command == "(color")
    iss >> R >> G >> B;

[fidelcashflo]

Thank you so much for the reply.

You are correct. Color is only one of commands.

Here are a couple of possible inputs:

Input:

(color 0 0 0.1)
(linewidth 2)
(translate 50 50)(rect -10 -10 20 20)

Output:

0 0 0.1 setrgbcolor
2 setlinewidth
40 40 moveto
60 40 lineto
60 60 lineto
40 60 lineto
40 40 lineto

Will work on the program and see what I can do. Thanks for the advice!

[fidelcashflo]

I seemed have gotten it working alright. Just need to tweak it a bit.

Here is what my code looks like so far:

#include <iostream>
#include <sstream>
#include <string>
#include <stdlib.h>
using namespace std;

int main()
{
	string line;
	string word;
	stringstream iss;
	ostringstream oss;
	float r, g, b, lw, t1, t2, r1, r2, r3, r4;
	
	cout << "%!PS-Adobe-3.1\n";
	while(getline(cin, line))
	{
		iss << line;
		iss >> word;
		
		if(word == "(color")
		{
			iss >> r >> g >> b;
			oss << r << " " << g << " " << b << " setrgbcolor\n";
		}
				
		else if(word == "(linewidth")
		{
			iss >> lw;
			oss << lw << " setlinewidth\n";
		}
				
		iss.str("");
	}
	
	cout.precision(2);
	cout << oss.str();	
	return 0;
}

Now when I give it the input:

(color 0 0 0.1)
(linewidth 2)

I get the output:

0 0 0.1 setrgbcolor
2 setlinewidth

So my question is how can I take an input like:

(color 0 0 0.1)(linewidth 2)

And get an output like this:

0 0 0.1 setrgbcolor
2 setlinewidth

Thanks for the help!

[Stewbond]

You could make ')' a delimiter. That is, the getline() function will treat this character as a seperator for a new line.

while(getline(cin, line, ')'))