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] ....
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May 2, 2013
When I try to assign strings to a double pointer, it only prints out the last string when I try to print everything out, and then it segfaults.
Code:
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <assert.h>
main(){
char **test = calloc(3,sizeof(char));
[Code] .....
Am I assigning something the wrong way? Also, I am trying to avoid using array notation in order to practice, at least for the assigning of the strings.
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Aug 26, 2014
I am trying to convert multiple lines of strings to double with std::stod .... I used the code found on the website:
#include <iostream>
#include <sstream>
#include <string>
#include <fstream>
int main() {
std::string two_doubles =" 22145.365 -3564789";
std::string::size_type K;
double first = std::stod (two_doubles, &K);
double second = std::stod (two_doubles.substr(K));
}
The string starts with white spaces. I get this error message when compiling:
warning unused variable 'first'
warning unused variable 'second'
How do you convert the two numbers in the string two_doubles to doubles?
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Nov 8, 2014
Code:
#include <iostream>
#include <string>
using namespace std;
int main()
[Code] ......
How do I link the strings to the integers?
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Apr 5, 2013
I have a file where the first column shows letters, second column shows numbers.
How could I make it to print everything exactly how it is in the file – a vector/array with strings and integers?
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Jan 29, 2013
I'm trying to write an algorithm for a larger project that will take two strings which are both large integers (only using 10 digit numbers for the sake of this demo) and add them together to produce a final string that accurately represents the sum of the two original strings. I realize there are potentially better ways to have gone about this from the beginning but I am supposed to specifically use strings of large integers as opposed to a long integer.
My thinking was to take the two original strings, reverse them so their ones position, tens position, and so on all line up properly for adding. Then one position at a time, convert the characters from the strings to single integers and add them together and then use that sum as the ones position or otherwise for the final string, which once completed will also be reversed back to the correct order of characters.
Where I'm running into trouble I think is in preparing for the event in which the two integers from the corresponding positions in their strings add to a sum greater than 9, and I would then have carry over some remainder to the next position. For example, if I had 7 and 5 in my ones positions that would add to 12, so I would keep the 2 and add 1 to the tens position once it looped back around for the tens position operation.
I'm not getting results that are in any way accurate and after spending a large amount of time stumbling over myself trying to rectify my algorithm, I am not sure what I need to do to fix this.
#include <iostream>
#include <cstdlib>
#include <string>
[Code]....
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Nov 15, 2013
While I execute the fileprint function i was able to retrieve the record from the txt file. but at the end of the console im getting randoms number i have tried to understand what causing the problem. I have attached a screenshot....
Code:
void fileprint(){ Code: int c;
struct student{
long id;
char name[20];
int mid1;
[Code] .....
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Sep 30, 2014
So I have this assignment to read a file in, malloc some arrays, run it through a perceptron and to display the final weights. I have the majority of it already written but this is only my third program in C and I'm more familiar with Java and Python than C.
The problem I'm having is when I read in command line arguments, I can't seem to parse integer values from the strings in argv[i] by using atoi().
I've included the piece of code where I'm trying to 'parse.' I understand atoi convers ascii to integer, but I don't understand if it just gives you the ascii code or the number that it actually represents. I attempt to use atoi on lines 33-35
The input arguments in the command line are:
bob in.csv 100 5 10
int main(int args, char* argv[]){
int ** ra; // array of array of pointers
FILE *ifp; // file pointer
char cc; // char var for reading input from file
int i = 0; // counter
[Code] ....
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Nov 16, 2013
i have prepared a code the read from txt file with values such integers and strings. but the code i have prepared reads only 1 line. how can i make the code to read multiple records from txt file.
input records example in txt file:
9009 James 90
Code:
#include<stdio.h>
#include<conio.h>
#include<stdlib.h>
void main()
{
int c;
struct student{
}
[code]....
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Dec 12, 2013
I'm very very new to maps and am really just trying to hash them out by myself.
If you're mapping strings to integers:
map <string, int> myMap;
myMap[ "zero" ] = 0;
myMap[ "one" ] = 1;
How do I print the string "zero", for instance, from myMap?
cout << myMap.at(0) << endl;
doesn't work. Nor does:
cout << static_cast<string>( myMap.at(0) ) << endl;
I need access to the string using the int and the int using the string. Or just direct access to one or the other. . . It's just confusing that they're technically mapped to one another but I can't really access either of them.
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Feb 11, 2013
I have a problem set where i have to read in numbers from a file as strings, convert from strings to integers, and pass the integers into a linked list, where each integer is a node. This is what I have so far:
Code:
# include <stdio.h>
# include <stdlib.h>
# define MAX_INT_SIZE 10000
typedef struct integer BigInt;
struct integer {
[Code] ......
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Jul 14, 2013
I am working on a text-based RPG game and I want to allow the player to save his progress. So I need to save several integers and a string. And my problem starts here "How can I save integers and load them?". I read the tutorial but I dont understand. I need to write a function to save game?
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Feb 23, 2015
I have been skimming and searching but dont know how to word the search just right to find what I need to know. I have written simple stuff with the support of tutorials like weight conversion or loops counting up to a set number. Nothing amazing. The other day I found out how to input and print a string rather than a single text character which i though was bad ass. I even got it to read multiple strings on a single line and found a way to read multiple lines. I can even format it to read both integers and characters on the same line as long as I know the predefined format.
On to my question... How do I read multiple lines with both carecters and integers. for instance:
nissan 1996
toyota 1998
or more comples like
nissan gtr 1996
toyota markii 1998
I want to use
int year;
char make[10]; maybe need to use char make[10][10]; for an array i would guess.
char model[10]; optional for the extra data
but reproduce what i read in a different order. say...
1996 nissan
1998 toyota
vice the original format.
this is what I have tried.
Code: scanf("%s %s", &make,&year);
//The way I seen to read multiple lines was on here
scanf("%[^/t]", %make);
But this wont let me separate the two into two differnet definded data types. Let alone use printf to display them in reverse order.
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Oct 10, 2014
I want to read a string of unknown length from stdin. I tried to follow the approach from this link.
[URL]....
My code is like this:
Code:
#include <iostream>
#include <string>
using namespace std;
int n;
cin >> n;
cout << "The value of n is " << n << endl;
string str;
getline(cin, str);
cout << "The entereed string is " << str << endl;
What I have noticed is that if I take integer input from cin (cin >> n in the above code before getline, the control does not stop on getline to take str as input from the console. If I don't do (cin >> n) before getline then the control stops on getline and takes the string as input.
What is the best way to read from console multiple strings of unknown length in combination with the integers?
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Dec 7, 2013
How would I fscanf this piece of data?
Delimiter is --> :
VS1234567890654327:Rob Fordfirst:001:200
VS1234567890654312:Steven Harper:200:010
Code:
while(3==fscanf(filename, "????", &string[size], &name[size], &number1[size], &number2[size])) {
//printf("%s - %s - %.3d - %.3d", string[size], name[size], number1[size], number2[size]));
size++;
}
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Mar 19, 2013
This is part of a bigger program im working on that deals with data structures, but I'm trying to figure out a way to tokenize a long file of purchases that is being read to my program. I rewrote the program to pinpoint my problem. I need to get the name, cost, item and quantity from this string. I figured out how to look for the cost, but what about the name and item(shirts)? How can I do this all in one loop because there are multiple strings and i'm gonna eventually send all the info to a data structure for each person(name)? I'm only asking about the tokenizing part, but this code works for the cost.
Code:
int main(void) {
char myString[] = "Angela bought 9 shirts for $6 each." ;
char * del = " " ;
char * token ;
[Code].....
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Apr 21, 2013
I have 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 need to read the id numbers into an array, the grades into a 2d array and the names into a 2d c-style string arrays.
But i'm having trouble getting past the delimiters
This is what i'm trying but it doesn't work
fin >> dummy;
fin >> id;
fin >> dummy;
fin >> grades;
[Code]....
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Feb 26, 2014
I am having some trouble tokenizing some strings in C. I am trying to take in a string dynamically and spit print it to the console tokenized using the spaces as delimiters. I have tried using frets() and scant() as well as playing around with pointer values to no avail.
#include <stdio.h>
#include <unistd.h>
#include<string.h>
#include <stdlib.h>
#define MAX_LINE 80
//function prototypes
void printArgs(int argc, char* args[]);
[Code] .....
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Apr 21, 2014
I'm a beginner at c++ and I need to write a program that reads a set of integers and then finds and prints the sum of the even and odd integers. The program cannot tell the user how many integers to enter. I need to have separate totals for the even and odd numbers. what would I need to use so that I can read whatever number of values the user inputs and get the sum of even and odd?
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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....
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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?
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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?
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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
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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?
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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....
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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?
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