I am looking at some C++ code that has many variables that start with underscores. Why? What's the point? I know in Python its a way to keep them private, but I don't understand why we would do that in C++ when we can just make something private.
View 14 RepliesI am doing a homework assignment. I do not want the complete answer, just a hint. I have to load a file of names into an array, display the names, then sort the names alphabetically, display them again, then list how many names start with certain letters. I have everything done but how to display how many names start with a certain letter.
Here are the names:
Collins, Bill Smith, Bart
Allen, Jim
Griffin, Jim
Stamey, Marty
Rose, Geri
...........
And here is the code I have so far.
Code:
#include <iostream>
#include <fstream>
#include <iomanip>
#include <string>
#include <algorithm>
[Code] ....
My motive is to get random variable at every start of program. So it does not show same sequence when it run again and again
Code:
int main(){
srand( time ( NULL ) );
cout<<rand();
}
When i run this program in code::block the following program is opening with error in new tab called TIME.H
Code: /* * time.h
* This file has no copyright assigned and is placed in the Public Domain.
* This file is a part of the mingw-runtime package.
* No warranty is given; refer to the file DISCLAIMER within the package.
*
* Date and time functions and types.
*
*/
[Code] ....
I haven't tried to run my program yet, but maybe I will save some trouble if I ask this question first.I am using MC PIC16F690, and I could make a pin high or low by writing RCx = 1 or 0, where x is the pin in the C port. However, I want to use the counter variable from a for() loop as the pin number. Will RC(variablename) = 1 work, or is there another syntax?
View 2 Replies View RelatedI have been playing about with Vertices and Colors and have ended up with this:
template < std::size_t SIZE, typename T >
struct Pack
{
[Code].....
Is there anyway to make an alias for Pack's data field? Something that would allow me to write:
Color3f my_color;
my_color.red = 0.1f;
I'm trying to find a way to call a variable checkbox.
i.e.
for (i = 10; i < 20; i++) {
Checkbox[i]->Caption = Some Database Information
};
Note: Checkboxes are all called Checkbox10 ~ Checkbox19
I am trying to write a program that would convert numbers of base 10, decimal numbers, to binary or hexidecimal numbers, base 2 and base 16. I want the program to run a loop through the various numbers input and store each number converted to the new type in a separate variable with the same basic name but different last letters/digits to differentiate between them and add them to the total.
Basically, I'm saying that i have the user input a number and letters. Let's say 15, d, b. So they want to convert 15 of decimal type to binary.
The program would then take the variable used to hold that number, and the other to variables to decide what function to perform on the number.
Then I will already have a variable initialized for the 3 possible conversions (binaryKey[], decimalKey[], hexideciKey[])
Then I want it to convert it and store the number at different places in the array to form the final number. Although, there is no way to predict what number the user will input, so there is no way of knowing initially where the converted place-value will need to be placed in the array.
I was wondering if there was a way to have the program run a loop where as the progression continues, it appends a number to the end of a universal name for the variables and then adds them together in the correct order creating the sequence that means that number.
In simpler terms:
Input a number: 15
Input type of base: d
Input converted type: b
Program then continually divides the number by 2, storing the remainder in a new variable
Such as: for(int i=1, i < (str(number).len), i++){
when i = 1, you would get
int number1;
[Code] ....
and so on. Is there a way to do this???
I have the following function.
void replacestring() {
quality = quality->Replace(" ", "_");
}
I wish to replace spaces with underscores in the string "quality"
When I compile I get the error message:
config_files.c: In function 'replacestring':
config_files.c:79: error: request for member 'Replace' in something not a structure or union
Here is the code: config_files..c
i have a vector of stores. i would like to delete the specified choice(store) from the list. Here is what i have but my erase statement is wrong and wont compile.
void Store::deleteSpecifiedStoreFromList(string choice) {
for (int i = 0; i < this->stores.size(); i++) {
if(this->stores[i].getStoreNames() == choice) {
this->stores.erase( std::remove_if( this->stores.begin(), this->stores.end(), choice ), this->stores.end() );
}
}
}
It's written here: URL....But those links don't work. I can't understand how to start programming using ncurses.
View 9 Replies View Relatedchar []c =null;
c=new char[1];
why star from [1] not from [0]???
I started writing in c because I want to control relays with the parallel port, or anything else. Doesn't really matter what I use I just need to know where to start. Trying to send and receive data from the outside world with c programming on a GNU/Linux os? If so any good some what up to date resources online?
View 5 Replies View RelatedI'm new to C programming and am quiet lost, create a program that takes a start and stop time and prints the passed, or show me where I can find the information needed?
View 6 Replies View RelatedHow would I go about getting a loop to return to the start?
View 2 Replies View RelatedHow do i start writing Gaming app using C++. What is the environment required. I have mingw compiler installed on Windows8.
View 4 Replies View RelatedWrite a program to simulate a printer queue (priority queue or heap – Bentley article has code) where 3 printers are “fed” by this queue. Each print job has an unchanging priority and higher priority jobs go first (although once started, a job isn't stopped to let a higher one go). For each unit of time, there is a 26% probability that a job will be added to the queue and all jobs take 8 time units to complete. Print job priorities are between 5 and 100. The queue opens 20 time units prior to the start of printing for adding print “jobs”. A print “day” is 1000 time units. The output from your program is:
1) A list of jobs completed with their priorities for each printer
2) A list of jobs not completed (if any).
#include <iostream>
#include <cstdio>
#include <cstring>
[Code].....
i want to add a prompt at the start of my program which ask a user to enter its password wat will be its syntax it is confusing me alot i have written this code but its gving me a problem
int security(char *num)
{
char pass[10];
ifstream file("pass.txt", ios::in);
[Code].....
My motive is to get random variable at every start of program. So it does not show same sequence when it run again and again ....
Code:
int main() {
srand( time ( NULL ) );
cout<<rand();
}
When I run this program in code::block the following program is opening with error in new tab called TIME.H
Code:
#ifndef_TIME_H_
#define_TIME_H_
/* All the headers include this file. */
#include <_mingw.h>
#define __need_wchar_t
#define __need_size_t
#define __need_NULL
#ifndef RC_INVOKED
#include <stddef.h>
#endif/* Not RC_INVOKED */
[Code] .....
I'm poking around with doing a few Haskell-like functions for linked-lists. Take, drop and so on.I've done the code below. The problem is that it mysteriously inserts a 0 at the start of the list.
Code:
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <string.h>
#include <ctype.h>
#include <malloc.h>
}
[code]....
I'm interested in learning how to write the software for audio synthesizers. a friend of mine started on the hardware side for them and, as i have no experience with this type of code.
View 7 Replies View RelatedRight now I am trying to make an alarm clock type program that will start on login and will go off when a certain time is reached. I also want to set a password that will prevent system use until the correct password is entered into the program's input. What functions will I need and how are they used?
View 1 Replies View RelatedSum up all the numbers between start and end. Lastly compare this sum to 1000.
--so i got the first part, but how to compare the sum to 1000.
I am making a product and in which i use a timer. I want when the product is being start the timer will run and when the product is off the timer will stop. If i again start the product the timer will start from its previous value.
I have problem that the timer start from its initial when i start my product.
How to write a simple script to convert F to C. That was easy enough once I read about how C treats the math of 5/9 being less then 1 thus converts to 0. Fixed that issue and the code works great.
I find it a useful tool and would like to, way outside of the scope of the homework mind you, figure out a way to get the script to restart if a [Yy] answer is provided at the end of the script. All other responses result in return(0).
I only have limited knowledge in BASH scripting. In BASH i would have just placed the int main(void) {foo} into a single function then created a simple if/then test after the function is called.
Reading up on functions in C, they do not work in the same way I would like to treat them from BASH. understandable this is not BASH.
then i started looking into do/while loops. On an other forum someone pointed out the possibility of using fgets as part of the challenge response. Now when I try to compile the code im getting an odd result. for some reason the compiler seems to think that my character string(or is it an array) is an integer...
Code:
/* 5. Write a program to convert a temperature in degrees Fahrenheit to degrees Celsius. *///##########################################################
// Created by Raymond L. Brunkow
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 2 or version 3 of the
// license, at your option.
//
[Code] ....
//above is were the homework ends, below is what im trying to do now.
/* Prompt for new input */
printf("
Would you like to enter a new temperature [Y]es or [N]o? ");
fgets( BUFFER, sizeof(BUFFER), stdin );
}
while ( sscanf( BUFFER, "%1s%*1s", ANS ) != 1 || strchr( "YyNn", *ANS ) == NULL );
return(0);
}
This results in the following error:
Code:
$ gcc -o hw_1_5.v2 hw_1_5.v2.c
hw_1_5.v2.c: In function "main":
hw_1_5.v2.c:52:
warning: passing argument 1 of "fgets" makes pointer from integer without a cast There is no integer there to be passed.
I want to know if there is a function or library that starts counting time when the program starts. Because I'm making a program that is dependent on time.
Pseudo code
time starts
if ( seconds % 2 == 0 ) {
counter++;
}
I would need to know how to make the c++ builder application to be started with administrator rights (it's common behaviour for installers - when it is started, it asks for administrator rights).
View 4 Replies View Related