My question is how strtok will work in the beginning?
According to this to determine the beginning and the end of a token, the function first scans from the starting location for the first character not contained in delimiters (which becomes the beginning of the token). And then scans starting from this beginning of the token for the first character contained in delimiters, which becomes the end of the token. The scan also stops if the terminating null character is found.
This end of the token is automatically replaced by a null-character, and the beginning of the token is returned by the function. strtok will replace the first * with '' and the next call will start from the second * puts '' there and again the same with the third * ?
I wrote this program, it's supposed to take a user-specified file, which has a bunch of numbers, and add all the numbers in a line and give me a sum and average.
This would output: ------------------------------------ Group Size = 2 i = 1 number = 1 Sum = 1 i = 2 number = 2 Sum = 3 Average = 1.50
Group Size = 3 i = 1 number = 1 Sum = 1 i = 2 number = 2 Sum = 3 i = 3 number = 3 Sum = 6 Average = 2.00
Group Size = 4 i = 1 number = 1 Sum = 1 i = 2 number = 2 Sum = 3 i = 3 number = 3 Sum = 6 i = 4 number = 4 Sum = 10 Average = 2.50------------------------------------ // END CONTEXT
Anyway, I wrote this program. Here it is. But strtok doesn't want to advance to teh next token?
Code:
#include<stdio.h> #include<stdlib.h> #include<string.h> int main(void){ int a, sum, number, groupsize; }
I'm playing around with parts of code and am coming across some errors. Most of my concern is related to strtok(). I've used it before but with a char* named token. I used a while loop to continuously check whether token was equal to NULL. In the following code, however, there aren't any checks. I was wondering if that is why this code prints (null) while running. Also, I would like to know if it is possible to read input like this code attempts to do - assigning tokens to each variable one after the other.
I am having a problem with the output of a file. My function does everything it needs to do with the exception of one line. I have a .dat file with the following:
Code: joe clint james brint howard jimmy alexander * me
When I run the function my output is as such:
Code: file opened word: joe digit: 3 word: clint digit: 5 word: james
[Code] .....
ERROR non alphanumeric digit on line 4!
File closed "Howard" is only six digits in length. Also it seems to skips a line in the output which could be the extra character but I am not sure. What I find very interesting is the other names, (jimmy & alexander) on separate lines do not have that problem.
Here is my function:
Code: #include "main.h" #include "fileCheck.h" int fileCheck(FILE *fp){
int line_count = 0; int ret_val = 0; int digit_count = 0; char file[BUFF];
[Code] .....
How I can correct this? I am aware of sscanf to parse the line but I do not know the format of the file. All I know is the file will be alphanumeric and if there is a non-alphanumeric, I must print out an error with the line it occurred on such as the above output.
I had an assignment to do a palindrome program but im stuck in this part.
"This c-string will be sent to a function that will remove all spaces and punctuation marks from its c-string as well as change any uppercase letters to lowercase. Use string tokens to eliminate the spaces & punctuation marks. Make sure you include the NULL as you concatenate the tokens into a c-string. Then copy back into the original c-string for the pass by reference."
I'm pretty sure I did that part except how can i pass this cstring back to main? We really haven't even touched much of pointers except to use strtok().
I'm trying to read a file from the 2nd argument, skipping the first line of the file since it's the name of the columns, and separate each line as a token, by date, subject, startTime, endTime, and location.Here's my code that I got so far:
I am writing another program and I cannot find for the life of me how to loop the program back to the start of a function.
Code: #include <stdio.h> #include <stdlib.h> int main(void) { int choice; char band1, band2, band3, band4; printf ("This program calculates the resistor value based on the colours of the wire. (enter the integer near the command) "); printf ("What would you like to do?
[Code].....
This is my current iteration of the program. Obviously, I haven't finished writing the case 1 of the first switch, but for the other ones. I thought that return main would cause the program to loop back to the beginning after executing the case, but I see that it is not the case (pun not intended). Anyways, what would I have to insert to cause the program to loop again (other than for case 3)? And another question, why is it that in scanf in the first case, the program only accepts two characters before finishing?
I've been struggling with linked list for a few days. I've tried performing a few operations. Here is my code. the add_begin() function doesn't seem to work.
#include<iostream> using namespace std; struct node { int data; node *next;
I'm writing a program that converts hex to letters and writes the letters to a file.To write I'm currently using ofstream("output.txt" ios::app)But the issue with this is, is that everytime I run the program, it appends and doesn't write from the beginning of the text file.So what I want to know is, how do I clear the contents of a text file, before writing to it?
I'm trying to learn structure type in C. In this trying, the code must take 9 value from user but it takes 6 values then returned. I scrutinized but I can't find my error.
In the assignment we are forbidden to use fscanf(). I have been trying to get this to work, but I've started to realize that I do not have a complete understanding of what strtok() actually does. I'm getting this warning when debugging: "assignment makes integer from pointer without cast."
This warning happens when assigning str to goal and assist, and I think it is because they are, when dereferenced, integers. The code below correctly assigns the name into the correct spot, but leaves nonsense data in the goal and assist arrays.
ex:-7880, -7888 file example: NAME GOALS ASSISTS JOHN 1 2
Code: void readLinesFromFile( FILE* Ptr, int* goal, int* assist, char** name, int lines ){/* * Reads lines from files and populates the arrays with the corresponding info. */ int index; char hold[ MAX_LINE ] = { 0 }; char* str = NULL;
[Code] .....
From what I understand about strtok(), it returns a string, and takes in a character array and a key value that tells it when to stop. In the online examples I've seen, they use NULL in the first field. I'm not sure why.
How do you add a value to the beginning of a string instead of the end?
This is for an assignment and I have to convert the user input (always assuming its a valid decimal number) to binary and store it in a string. I've got up to dividing by two to get the remainder ...
My program had a requirement to ignore an input beginning with a # sign. The input is entered by user from keyboard. I wanted to know how to use cin.ignore to achieve this.
So I'm making my first program w/ C++ and its a game guessing game. I've learned how to use booleans, chars, strings, if/else, loops, and input. Anything past that I dont know. I've gotten my game to work properly except for the fact that when you guess incorrectly, the program closes. I want the program to go to the beginning of the program again so the user can restart. So far i've gotten the loop to beginning thing to work but not well. It'll only repeat twice before closing again and it'll say the user got the wrong answer even if it was correct. Here's my code
#include <iostream> #include <string> #include <random> #include<ctime> using namespace std;
How do I write a ROM BIOS routine which accepts a row number from the user and place the cursor to the beginning of the row number which the user gave?
I am currently having problems creating a loop that will allow my user to choose to return to the beginning of the program or quit.
#include <iostream> using namespace std; int main() { int j; do {float a; cout << "+----Welcome to Basic Operations----+ | Select Your Operation |
[Code] .....
I have not yet finished designing the interface for a couple of the operations, but right now i am hung up on trying to return to the beginning. I believe it is because the j was defined inside do and isn't carried out of the do statement for while.
Assume you want to use a loop to process an array of characters starting from the beginning of the array. You want the loop to stop when you read the null terminator character from the array. Fill in the loop test condition that will make this work correctly.
index = 0; ch = array[index]; while ( _____________________________) { // process the character index++; ch = array[index]; }
// Write a function called insertEntry() to insert a new entry into a linked list.
Have the procedure take as arguments a pointer to the list entry to be inserted (of type struct entry as defined in this chapter), and a pointer to an element in the list after which the new entry is to be inserted.
// The function dveloped in exercise 2 only inserts an element after an existing element in the list, thereby prenting you from inserting a new entry at the front of the list.
(Hint: Think about setting up a special structure to point to the beginning of the list.)
This is a working version of the exercise, but I don't think I'm doing what's asked. I was able to add an element to the beginning of the list using an if statement, not creating a special structure that points to the beginning of the list. How would I go about creating a special structure that points to the beginning of the list to add a new element at the beginning of the list?
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....
I am writing a simple console-based tic-tac-toe game. I am trying to write a function to check whether someone has won the game.
The board data is saved in an array called board: Code: int board[3][3] with each element corresponding either to an empty spot, an X, or an O, using the numbers 0, 1, and 2, respectively. For clarity:
Code: #define EMPTY 0 #define X 1 #define O 2 Here is my function: Code: int check_state(int board[3][3]) { int winner = 0;
