Input whole String

**hqt** · 09-15-2011

I want to ask: in C/C++, for example:

Code:

#include<string>
using namespace std;
int main(){
    string str;
    cin<<str; //Input: New Problem
    cout>>str; //Output: New
    return(0);
}

It's mean, when input, It will terminate when see space character and maybe literal character,too. So, how can It will take all of character that I have typed.

thanks

**laserlight** · 09-15-2011

Use std::getline to read a line into a std::string object.

**hqt** · 09-15-2011

Oh, I have search getline and test, It's OK, but not as you say, <readline> read a line and put into char array in C. this is my example:

Code:

#include<iostream>
using namespace std;
int main(){
   char str[10];
   cin.getline(str,10);
   cout<<str;
   return(0);
}

So, we use char array in C again !!! (but many people have said to me, that not recommended in C++). So, please give an idea, please.

thanks

**laserlight** · 09-15-2011

You should read carefully.

Code:

#include <string>
#include <iostream>

using namespace std;

int main() {
    string str;
    getline(cin, str); // Input: New Solution
    cout << str << endl; // Output: New Solution
    return 0;
}

**AndrewHunter** · 09-15-2011

Originally Posted by hqt

Oh, I have search getline and test, It's OK, but not as you say, <readline> read a line and put into char array in C. this is my example:

Code:

#include<iostream>
using namespace std;
int main(){
   char str[10];
   cin.getline(str,10);
   cout<<str;
   return(0);
}

So, we use char array in C again !!! (but many people have said to me, that not recommended in C++). So, please give an idea, please.

thanks

You used the wrong getline, note Laser said to use std::getline. Here:

Code:

#include <iostream>
#include <string>

int main(void){

	std::string line;

	std::cout<<"Enter a line: ";
	std::getline(std::cin,line); //this is the correct getline to use

	std::cout<<"You entered: "<<line;

	return(0);
}

**hqt** · 09-15-2011

Oh, so great !!! But I have read this page: (the first link on google when I type: C++ std::getline)
istream::getline - C++ Reference
So, maybe have some different between <std::getline> and <istream::getline>

************************************************** ******
<add for more information>
Ahh, and know I see what <getline> that laserlight have said(this <getline> in string library, and above <getline> in iostream libray, so interesting

)

http://www.cplusplus.com/reference/string/getline/

**AndrewHunter** · 09-15-2011

Originally Posted by hqt

Oh, so great !!! But I have read this page: (the first link on google when I type: C++ std::getline)
istream::getline - C++ Reference
So, maybe have some different between <std::getline> and <istream::getline>

istream::getline (e.g. cin.getline)
std::getline

They are two different functions.

**hqt** · 09-15-2011

But, hmmm, sorry, maybe I have another questions please (just for learning purpose), that I want to know, how can do this(read a whole line) in C. (because, in C, there no iostream and string library).

I have one solution use fget(), to take each character and processing it, but I think it isn't beautiful so much. So, who know this problem, tell me, please.

thanks for tons

**laserlight** · 09-15-2011

Originally Posted by hqt

But, hmmm, sorry, maybe I have another questions please (just for learning purpose), that I want to know, how can do this(read a whole line) in C. (because, in C, there no iostream and string library).
I have one solution use fget(), to take each character and processing it, but I think it isn't beautiful so much. So, who know this problem, tell me, please.

fgets

**AndrewHunter** · 09-15-2011

Originally Posted by hqt

But, hmmm, sorry, maybe I have another questions please (just for learning purpose), that I want to know, how can do this(read a whole line) in C. (because, in C, there no iostream and string library).

I have one solution use fget(), to take each character and processing it, but I think it isn't beautiful so much. So, who know this problem, tell me, please.

thanks for tons

You would use fgets:

Code:

#include <stdio.h>


#define BUFSIZE 50

int main(void){

	char line[BUFSIZE];

	printf("Enter a line: ");
	/*in C you would use fgets*/
	fgets(line,BUFSIZE,stdin);

	printf("You entered: %s",line);

	return(0);
}

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