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
You have to expect the following input : an arbitrary amount of lines, each line consists of 5 int32 numbers. The full input will be terminated by an EOF.
E.g.:
1 2 3 4 5 6 7 8 9 0 ...
You`re then supposed to convert the numbers to integers and do some calculations. I would know how to parse a single line of 5 numbers via scanf(). That`s easy, and that`s exactly what they did in class.
But how do i go about splitting the lines? What about the EOF? Even if could hack something together, by using errno or something, it would be way beyond what they are doing atm. The input is received via user input, ie stdin.
const string ABC = " A B C D A 1 -1 2 14 B 0 -2 -4 8 C 6 2 2 3
" so if i have it as a string stream and then loop through each line like this:
Code: istringstream in (ABC); for (string line; getline(in, line); ){ vector<char> vec(line.begin(), line.end()); for (int i = 0; i< vec.size(); i++) cout << vec[i] << " "; }
I get my strings chopped into characters. but how to chop it into "meaningful" characters so that -1 is not - and 1. is there any quick way for that to happen ??
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.
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;
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.
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.
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 {
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?
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.
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?
I am about to transfer a project I have written in Applescript and Objective C to Excel/VBA/dll. I have started with the Objective C functions that I want to place in a dll and call via VBA.
The Objective C is C with a thin dusting of special Obejctive C code to have it talk with Applescript and the rest of the project so in theory it should be easy to make dlls written in C from it.
But I have already problems with the tiniest of all functions. I am sure it can be done more effectively but right now I need to know WHY it doesn't work if I am ever going to be able to transfer the much larger functions from Objective C to C.
Here is my original Objective C code:
Code: -
(NSNumber *)game:(NSNumber *)games gamechange:(NSNumber *)gameskifte { int gamesab = [games intValue]; int gameskifteab = [gameskifte intValue];
The problem deals with writing a program to geta series of integers from a user and storing those values into an array. Then use a function called selection_sort, when given an array with n elements, the function must sort the array from smallest to largest values.
I have code, and im trying to get it to compile but im getting these implicit declaration errors and conflicting types. Here is my code and the compiler errors.
Code: Compilation started at Sun Feb 10 20:14:48
gcc -Wall -o ex9-1 ex9-1.c ex9-1.c: In function 'main': ex9-1.c:16:5: warning: implicit declaration of function 'selection_sort' [-Wimplicit-function-declaration] ex9-1.c:20:2: warning: implicit declaration of function 'prinf' [-Wimplicit-function-declaration] ex9-1.c: At top level:
[Code] ...
Compilation exited abnormally with code 1 at Sun Feb 10 20:14:49
Code: #include <stdio.h> int main(void) { int a[100], i, j, N; printf("How many numbers will you be entering: "); scanf("%d", &N);
I understand most of program below. Essentially, we have strings that we want to convert from hex values to decimal equivalents. We check if first two characters of string are 0x or 0X, which signifies hex format. If our hex string consists of solely digits like 0x25, then the processing is simple. We take the digit assign it to answer variable, and for each additional position in the hex base-16 system, we multiply the digit by 16.
Now if the hex string is something like 0x2A, then for 'A', the hexalpha_to_int() function is called, since we are able to find 'A' in the hexalpha string, we take the value of 'A', which is ascii 65 divide it by 2 and add 10 to it: 65/2+10=42.5. This doesn't make sense. What is the purpose of this logic right here: 10 + (i / 2).
Code: #include <stdio.h> #include <stdlib.h>
int hexalpha_to_int(int c){ char hexalpha[] = "aAbBcCdDeEfF";
For an assignment I have to write a program which basically converts 8 bit binary numbers to ASCII and outputs the assembled text. Here's the catch:
The 8-bit binary numbers are provided by some external file (which only contains 8 bit binary numbers); the name and hence length is not known. The external file is called with a pointer upon execution
(./"conversion program" < external_file.in).
I'm getting the 8 bits as a string, calculate/convert decimals, output char type. HOW do I know when to stop the loop? If I just pick an insanely high number I get random stuff at the end; no boundaries obviousely lead to an infinite loop. Can I determine the lenght of this random ext file somehow nonetheless?
Is it possible to create a vector which dynamically adjusts itself until there are no more strings = end of the file?
My assignment is writing Madd Libs game. I still do not understand how to store inputted strings or values to arrays. I need explanation of collecting inputted data to arrays.
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?
So im trying to parse a string into a Ip Address but i have a problem, the IPAddress.Parse method only works for ipv4 address's how do i parse ANY Ip address into a string, if i use the IPaddress.Parse method on my public(remote) IP it throws an exception but on ipv4 local ip it doesn't how do i parse ANY ip address the user inputs as a string as an Ip Address?
I have been here for almost 3 months looking for answers in my C++ problems.here's some type of code for this.
cout << "Enter value of x: " << endl; //Let's say 5. cin >> x; cout << "Enter equation: "; //Let's say x+1 cin >> equation;
Then the program analyzes that this character "x" has an initial value of 5.I already have the parser for the equation functions (+,-,*,/)This is the only thing lacking. Is there some type of function that i missed?
I'm parsing an xml file full of payslips and using the data in another application. I've got it all working but I suspect it isn't the most elegant piece of code. I run through the xml file finding a series of "Text" attributes/elements" and then I run through it again finding a series of "Field" attributes/elements, Here is a sample of the code:
// // Get all the Text attributes & Elements // foreach (XElement xtxt in xdoc.Descendants(ns + "Text"))
[Code]...
This works fine, I extract all the data I'm interested in and go to do my thing with it. However I really need to know when each record ends and I was doing that by looking for "Text24" in the text fields and "EeRef2" in the field fields, which wasn't very elegant in the first place. Then a "Text16" was added to end of each record which was fine I could just look for "Text16" but now it's apparent that "Text16" isn't always there. I've got it all working for now but I'd prefer to process one record at a time i.e. extract all the "Text" & "Field" values for one record, do whatever I need to do with it, update the xml file to indicate this progress ( if possible ) and then move on to the next record. I've attached a sample of the xml but basically is has the following structure :
