C++ :: Getline Won't Work

Nov 14, 2013

I've just started learning from "Jumping into C++". Great book. Unfortunately, I've also encountered my first snag. Practice problem number 3 from chapter 4 tells me to make a small calculator that takes one of the four arithmetic operations and its two arguments as input and give the result as output. Here's what my newbie mind came up with:

Code:
#include <iostream>
#include <string>
using namespace std;
int main()

[Code] .....

The thing that I don't get is why doesn't the function "getline" work. It's worked in previous programs. The program seems to work if I simply replace getline with a simple "cin". I could easily use that as a cheap fix but I am interested in knowing why "getline" refuses to work anymore....

View 3 Replies


ADVERTISEMENT

C++ :: How To Check For EOF Without Getline

Mar 16, 2014

I'm currently trying to write a while loop that checks if the text file has read all the contents inside. I've tried using

while(!in.eof())

but as usual it executes my loop an extra iteration, printing my last output twice. I am reading my data in from a method inside a class, so I cannot use getline as my while test to check if the file has read input or not. Is there any way to force my loop to check if the end of file has been read before the eof() test is executed?

View 9 Replies View Related

C++ :: Using Getline And IF Operation?

Mar 13, 2015

I am just trying to get a code going for a mock test and to get use to the getline and IF operations, but it seems I have ran into an issue[URL] is a link to the code I have written, and I can use getline to give a value to my variable, but it seems like it gets lost once I try to use the IF function. Am I not using the right variable type?

View 14 Replies View Related

C++ :: Getline Ignores SOME Whitespaces

Dec 10, 2013

I'm using getline to read in from a file line by line but it skips the first two whitespaces.

Example input:
1 0.7 mountain and grant

How it's being stored:
10.7mountain and grant

View 14 Replies View Related

C++ :: Getline Function Does Not Seem To Activate

Feb 26, 2013

I have just started working through "Jumping into C++". I am at the section on appending strings. The tutorial mentions the getline function but I can not seem to get it to activate. There is no mention of any other inclusions.

Code:
#include <iostream>
#include <string>
using namespace std;

[Code] ....

I note that the getline function color remains black while other functions are green. I presume this means that Codeblocks has not associated it with any of the listed header files. Has the tutorial omitted this detail?

View 4 Replies View Related

C :: How Getline Function Works

May 15, 2013

How the getline function works.

Code:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main() {

[Code] ......

getline(&inputstr, 128, NULL); getline gets a line in a data file.

I assume that inputstr[128] is the name of the file? why is the number of the array in the getline function....

View 7 Replies View Related

C++ :: Getline Skipping First Time

Apr 25, 2014

why does this happen that if i use

string ans;
for(int i=1; i<3; i++)
{
cout << "enter an option" << endl;
getline(cin,ans)
}

in a loop it always skips the first time but in the next times it asks?

View 3 Replies View Related

C++ :: Getline As Conditional Of While Loop

Aug 1, 2014

I am trying to use getline as the conditional for a while loop as seen below.

string filename, guard_name;
int call_number;
vector <Seniority> SeniorityList;
ifstream SeniorityFile;

[Code] ....

However, when I compile the code, I get the following error message on the line with the while loop.

error C2780: 'std::basic_istream<_Elem,_Traits>
&std::getline(std::basic_istream<_Elem,_Traits>
&,std::basic_string<_Elem,_Traits,_Alloc>
&)' : expects 2 arguments - 3 provided

The program will be reading in a .csv file, so I need my program to be able to deal with values separated by commas. Is there a reason why it will not accept that conditional statement?

View 3 Replies View Related

C++ :: Getline Skipping First Line?

Aug 21, 2014

text file is

hello
there

void readFile(char[], ifstream&);
address records[numbersAdd];
int main(){
char xml[30];
cout<<"Enter file name ";

[code].....

View 6 Replies View Related

C++ :: Getline Is Not Displaying In One Line

Feb 16, 2014

I used getline to import EMPLOYEE's First and Last Name from a txt file. After calculating the weights ans stuff. Now when i try to write to output txt file am having the below issue in which its not putting it in one line.

***CODE***
fout << "Note: This report for " << employee << " was prepared according to the fair practice of the University." << endl ;

***THIS IS WHAT ITS PRINTING***
Note: This report for FIRSTNAME LASTNAME was prepared according to the fair practice of the University.

I also tried like this;

***CODE***
fout << "Note: This report for " << getline(fin, employee) <<" was prepared according to the fair practice of the University." << endl ;

***THIS IS WHAT ITS PRINTING***
Note: This report for 0 was prepared according to the fair practice of the University.

this second code puts everything in one line but its showing 0 (zero) instead of the employee's first and last name.

View 4 Replies View Related

C++ :: Reading From File Using Getline

Mar 30, 2014

i got a file (teams.csv) which has the following content:

id,name
501,Abilene Chr
502,Air Force
503,Akron
504,Alabama

Now i want to read line by line using getline(). How will i do that?

View 2 Replies View Related

C++ :: How To Use Getline With Switch Statement

Sep 17, 2014

I have a problem with the switch statement because it doesn't prompt me to input something.

#include <iostream>
#include <fstream>
#include<cstring>
using namespace std;
//Compiler: Dev C++ and cygwin
void rd() {
string txt;

[Code] ....

I want to get rid of this kind of output ...

View 5 Replies View Related

C++ :: Getline Overloaded Error

Dec 5, 2014

I am currently having trouble to have getline to read line from the file. Error is: "no instance of overloaded function "getline" matches the argument list"

code is as follows:

std::ifstream config("config.txt");
string process[4];
int linecount = 1;
if (config.is_open)
{
while (config.peek() !=EOF)
{
getline(config, process);
linecount++;
}
}

View 5 Replies View Related

C/C++ :: Getline Won't Wait For Input

Jun 6, 2014

Down on line 74, it does not wait cor an input, it simply says ...you failed.

#include <iostream>
#include <string>
#include <Windows.h>
#include <cstdlib>
using namespace std;
//prototyping--
void flater();

[Code] ....

View 6 Replies View Related

C++ :: How To Use Multiple Terminals In Getline Function

Sep 11, 2014

I am reading a file of text. I want to read in every word, but no spaces or newlines. "word" is a string, and "c" is a char (used for getting rid of white space. The problem: I can get rid off spaces perfectly, but newlines remain in "word" if it comes before the terminating character ' '.

My code:

while(infile.good() && !infile.eof()) {
while(infile.peek() == ' ')
infile >> c;

while(infile.peek() == '

[Code] .....

View 3 Replies View Related

C++ :: Getline Out Of Stringstream Should Not Cut Leading Whitespace

Jul 1, 2013

I have a std::stringstream sstr I read data from with getline(sstr, s, ',').

Now I don't want it to cut off the leading blanks. How can I do that?

View 2 Replies View Related

C++ :: Using Getline To Parse From A Text File?

Nov 23, 2014

I'm trying to make a program where it reads a text file which contains "blocks" of questions like:

Type: multiple_choice
Question
Num_options: number of options
a) option1
b) option2
c) option3
d) option4
Letter of answer

and

Type: short_answer
Question
Answer text

what I'm trying to do is use parse those blocks and have it get handled by the classes, MultipleChoice and ShortAnswer.

I'm planning on using getline as a virtual function and have an if statement like
"if (string == "multiple choice)
** then get it handled by the MultipleChoice class "

View 10 Replies View Related

C++ :: How To Use A String As Delimiter In Getline Function

Feb 4, 2014

How do I use a string in place of a character in the function getline?

For example,

getline(infile,lines,'}');

This works fine, but I want the delimiter of } to be "};", but I can't do this as it only takes in characters, not strings.

I want:

getline(infile,lines,"};");

Any way to get around this?

View 1 Replies View Related

C++ ::  String Termination Using The Getline Function?

May 28, 2013

I came across a strange problem while writing a program using the getline function. I understand that when using the getline function an input string will terminate when the "enter" key is pressed and in the following program it works as one would suspect.

#include <iostream>
#include <string>
using namespace std;
int main() {
string str;
cout << "Enter: ";
getline(cin, str);
cout << str;
}

However when I use it in this next program (below) that I have been working on it will only terminate after pressing the "enter" key if the first character is a number, otherwise it will not terminate. So the question is: How do I get it to terminate the string regardless of the input order?

#include <iostream>
#include <string>
using namespace std;
int i = 0, j;
int numValue;

[code]....

Additional Info: the purpose of this program is to change a character, which is extracted from a string, into an equivalent numerical value, if the character is an integer, and assign it to an int variable. I plan on eventually adapting it to return the correct value of a multi-character integer such as 123.

View 2 Replies View Related

C++ :: While Loop Is Not Being Executed With Getline As Argument

Dec 16, 2014

This is the code i am working on: [URL] .... I had designed a cross platform grep and am revising it to making it more well for lack of a better word understandable, and clear.

The line

while(getline(file, currentLine))

Worked before but now it doesn't.

View 1 Replies View Related

C/C++ :: Getline Not Allowing To Read A Sentence

Apr 15, 2014

I wrote this program:

#include <iostream>
#include <ctime>
#include <ctype.h>
#include <vector>
#include <string>
#include <sstream>
using namespace std;

[Code] ....

LETTER OR '.' ? s
LETTER OR '.' ? f
LETTER OR '.' ? b
LETTER OR '.' ? e
LETTER OR '.' ? a
LETTER OR '.' ? g
LETTER OR '.' ? .
VECTOR : [ SFBEAG ]

SENTENCE ?

But after this i can't write anything. Do you know why? I've never had problems with getline... when i used cin >> it read but only one word. Now it doesn't even let read...

View 1 Replies View Related

C/C++ :: Retrieving User Input With Getline?

Mar 7, 2015

I'm writing a simple text adventure style program in order to practice C++. I originally used char to get whether the user wanted to go north, south etc, requiring they enter W, A, S, or D, and then I used a switch statement, rather than a bunch of else if blocks to move in the appropriate direction. Last night I started updating the code and wanted to require the user type an actual string like "go north" to move, so I'm in the process of converting it over to getline();.

The way it works is the user will input "go north", and if the string is equal to "go north" it will set a variable to 1, 2, 3, or 4, so I can keep the switch statement. The program compiles but whenever it asks for user input, it always hangs waiting for 2 separate lines of input regardless of whether or not you put a space between your command. The move function is as follows:

void movement() {
bool loop = true;
int roomNorth = 0;
int roomWest = 0;
int roomSouth = 0;
int roomEast = 0;
int dirOption;
string dir = "";

[code]....

I read that it could be an issue with getline and the new line characters, which is why I added the cin.ignore in there...so yea the code will wait for 2 separate lines of input and then always outputs "Invalid direction!" regardless of the input.

View 3 Replies View Related

C++ :: Using Getline Multiple Times On One Line Of Input

Sep 15, 2014

I've been stuck on this for hours, and have scoured the internet for any insight on this particular issue with no luck.

I'll simplify the problem here. I have a lines in an input file:

John Smith 1234 Main St New York
Carol Thomas 5678 5th Ave Columbus
...
and I am reading into character arrays using code like this:

infile.getline(name,20);
infile.getline(street,15);
infile.getline(city,10);

but when I print the output using something like this:

outfile << "Owner Name: " << name << endl;
outfile << "Address: " << street << city << endl;

(let's pretend I included spaces between the address components, which I omitted to save space)

I get an output file of:

Owner Name: John Smith
Address:

The output stops after the name variable, which I believe is stored correctly. I don't think anything is storing in the address pieces, this is the problem.

I think it's because I'm not using getline() properly in this case. Can you string together multiple getline()s like that?

If this was my design, I'd read in strings instead, but that is not possible in this case.

View 6 Replies View Related

C++ :: Getline With Integers / Double / Strings And Delimiters?

Apr 22, 2013

I want to use getline to read stuff from a file that looks like:

Student ID:88152; Grades: 83.67, 92.45, 74.43, 97.95, 76.45; Name:Abercrombie, Neil
Student ID:92485; Grades: 77.65, 92.31, 60.47, 67.12, 99.64; Name:Aderholt, Robert
Student ID:10623; Grades: 37.95, 83.11, 64.46, 74.76, 95.30; Name:Alexander, Rodney
Student ID:76793; Grades: 53.13, 81.02, 83.71, 90.75, 88.92; Name:Baca, Joe

I have to print to the screen the id numbers, the grades and the names

I'm using getline but im having trouble print out the grades

It gets and displays everything except the grades. One of the grades only gets displayed

It should be a while loop, but im just working with the first line for now

ifstream inf;
char fileName[ MAX_STR_LEN ] = "ex.txt";
char testStr[ MAX_STR_LEN ];
int testInt;
double testDouble;

[Code] ....

View 3 Replies View Related

C++ :: Getline Function Adds Another Line To Output

Aug 10, 2014

Taken from Accelerated C++ book, I modified those code to use getline() instead of std::cin >> only to find out that the output has extra line. Why is that so?

#include <iostream>
#include <string>
int main() {
std::cout << "What is your name?" << std::endl;
std::string name;

[Code] .....

What is your name?
Naruto
*****************
* *
* Hello, Naruto
*
* *
*****************

Notice one asterisk after the greeting where it should be in the same line as the greeting.

View 4 Replies View Related

C++ :: Reading In Data From A File And Using Getline Function?

Apr 19, 2013

I am trying to create a program that reads data about different songs in from a file and displays the total length of all the songs and the average rating of all of them. Here is an example of the data that I would be reading in:

Just Give Me A Reason|P!nk Featuring Nate Ruess|4:22|4.0

When I Was Your Man|Bruno Mars|3:33|3.5

Thrift Shop|Macklemore & Ryan Lewis Featuring Wanz|3:55|4.5

I think my program is close to being done but for some reason it is not returning the correct length and average rating of all of the songs.

#include <iostream>
#include <string>
#include <fstream>
#include <cstdlib>
using namespace std;
// Structure declaration
struct Song {

[code]....

View 1 Replies View Related







Copyrights 2005-15 www.BigResource.com, All rights reserved