next word of input

[heroicJ]

I'm curious about reading in a line of input until certain words are reached and then saving the NEXT word/number of input into a variable. How would one go about doing this with stringstreams, if there is a way?

[Avilius]

Something like this?

#include <iostream>
#include <string>

const std::string toRead = "Read me x now!";

int main()
{
     std::string output = "";
     bool hitchar = false;
     for(unsigned int i = 0; i < toRead.size(); i++)
     {
          if(toRead[i] == 'x')
              hitchar = true;

          if(hitchar)
              output.append(toRead[i]);
     }

}

Something like that. Haven't compiled it but it should work with little to no issues.

[EwCjE3v7]

#include <iostream>
#include <string>

const std::string toRead = "Read me x now!"; // why this, this is bad style of coding

int main()
{
     std::string output = "";
     bool hitchar = false;
     for(unsigned int i = 0; i < toRead.size(); i++)
     {
          if(toRead[i] == 'x')
              hitchar = true;

          if(hitchar)
              output.append(toRead[i]);
     }

}

NEXT word/number of input into a variable

Can you explain in a little more detail

[Avilius]

Can you explain how that is a bad style of coding? If you're saying so because it's a global variable, I only created one because this is most likely a homework-ish assignment, or a simple exercise. If you really want to, you can just put the global in the main function...

[heroicJ]

For example if it encounters the word "AVERAGE" then it should read the numbers following. If the word NAME is read then the next word should be stored as name.

[Avilius]

Ah, I see. Just add a simple edit.

#include <iostream>
#include <string>

int main()
{
     const std::string toRead = "Read me AVERAGE now!";

     std::string output = "";
     bool hitchar = false;
     for(unsigned int i = 0; i < toRead.size(); i++)
     {
          if(toRead[i]     == 'A' &&
             toRead[i + 1] == 'V' &&
             toRead[i + 2] == 'E' &&
             toRead[i + 3] == 'R' &&
             toRead[i + 4] == 'A' &&
             toRead[i + 5] == 'G' &&
             toRead[i + 6] == 'E' &&)
             hitchar = true;

          if(hitchar)
              output.append(toRead[i]);
     }

}

EDIT: You can switch out the word "now" with the numbers you'd like.

[heroicJ]

That's helpful, but do you know of a way to do it using sstreams?

[Avilius]

Yea, off the top of my head (I didn't compile & test)

#include <iostream>
#include <string>
#include <sstream>
#include <vector>

int main()
{
	std::vector<std::string> tokens;
	
	bool hitkey = false;
	
	std::string output;
	const std::string s = "You should AVERAGE read me.";
	std::string key = "AVERAGE";
	std::istringstream iss(s);
	
	while(iss)
	{
		std::string sub;
		iss >> sub;
		
		tokens.push_back(sub);
	}
	
	for(unsigned int i = 0; i < tokens.size(); i++)
	{
		if(hitkey)
		{
			output.append(tokens[i]);
			output.append(' ');
		}
	
		if(tokens[i] == key)
		{
			hitkey == true;
		}
	}
	
	std::cout << "Output : " << output;
	
	std::cin.get();
	
}

[heroicJ]

Big help thanks! Is there also a way to have it add to a score after average until it detects a non number? Is it valid to do an if somehing == int test?

[Avilius]

Yes, like this:

bool isInt(const std::string str)
{
	for(unsigned int = 0; i < str.size(); i++)
	{
		if(!(str[i] >= '0' && str[i] <= '9')) return false;
	}
	
	return true;
}

[heroicJ]

So this is what I have before even formatting output.

#include <iostream>
#include <string>
#include <sstream>
#include <vector>
using namespace std;

int main(){
    vector <string> tokens;
    string s;
    bool hitavg = false;
    bool hitname = false;
    string avgKey = "AVERAGE";
    string nameKey = "NAME";
    string sub, name;
    bool isInt = false, isAvgInt = false;
    string stuName;
    int score, avg, final, finalavg;

    cin >> s;
    istringstream iss(s);

    while(iss){
        iss >> sub;

        tokens.push_back(sub);

    }
    for(unsigned int i = 0; i < tokens.size(); i++) {
        if (hitavg){
            for (int a = i; a < tokens.size(); a ++)
            {
                if (!(tokens[i] >= '0' && tokens[i] <= '9')) return false;
                else avg += tokens[i];
            }


        }
        if (hitname){
            name = tokens[i+1];
        }

        if(tokens[i] == avgKey) hitavg = true;
        else if (tokens[i] == nameKey) hitname = true;
    }





return 0;
    }// end of main 

It will not compile and gives me several errors.