C++ :: Difference Between Erase And Clear

Apr 4, 2014

vector<int> *vec; allocate memory and

suppose vec conatins 10 values then

erase(vec->begin(),vec->end());

vec.clear();

both should be used or any one one is fine to erase all ??

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C :: Erase From TXT File Lines That Contain One Name?

Feb 4, 2013

Well, I have a .txt file that contains, together with a few characters, columns of values that I want to save in different files like is written in the program (file 1, file2, file3 - a with x, b with y, c with z). BUT, I don't want the values from the lines with the saying "interpolated_vector" to be printed in any of the three files.

What I have is the code below, that has the code that creates the three new files with the columns of values that I want. It is working fine!

Code:

#include <malloc.h>
#include <stdio.h>
#include <stdlib.h>
int i, count;
double *a, *b, *c;
double *x, *y, *z;
char tag[5][255];

[Code]...

I've tried and tried, but couldn't make it work properly. I could only erase one line with "interpolated_vector" using fgets, but all the other lines below this were printed into the three new files (file1, file2, file3).

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C++ :: Erase Part Of The String?

Sep 29, 2014

Code:
// string::erase
#include <iostream>
#include <string>
int main () {
std::string str ("This is an example sentence.");
std::cout << str << '
';
str.erase (10,8);
std::cout << str << '
';

Code:

Output:

I don't understand this program. What do these 2 numbers represent? The index of an element in a character array? The 10th character of the array is 'n' and 8th is a "space".

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C++ :: Erase Multiple Values In A Vector

Mar 17, 2014

I wud like to delete multiple values from a vector using indexes as my values r not fixed they may change so using indexes i want to delete

For example: vector<int> v={1,2,3,4,5};

I want to erase 3,4,0 indexes

So resulting vector is 2,3

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C# :: Erase Inner Border Between 2 Columns Of Table Layout?

Oct 7, 2014

So in my winform form, I have a table layout panel and I attach Controls on the row. I make some control span multiple columns... But since I use transparent for the background of the layout panel, it show the border between 2 cells that I span.. Like this:

How do I erase the border in the middle of IDLabel?

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C++ :: Find String To Erase Symbol From The End Of A Word

May 2, 2013

I'm trying to use the find string to erase a ' ' from the end of a word. I tried something along the lines of:

if (SecondSide.find('
')!= string::npos)
SecondSide.erase(SecondSide.find('
'));

but it had no effect.

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C++ :: NorFlash Memory Access - Read / Write And Erase Data

Sep 5, 2013

I am doing a project which I have to read, write and erase data from a NorFlash Memory. Then, I have to compare those data files in order to find errors.

Besides, I would like to know which is the best way to TEST errors in this kind of memories.

I am using NetBeans 7.3.1 for writting the code and Cygwin running on Windows XP Virtual Machine. The Memory Flash (S29JL064J 64 Megabit) is incorporated on an external board which is connected to an adapter board (using HDMI cable). This adapter is connected to the Laptop (using an USB).

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C++ :: Data Structures - File Size Not Decreasing When Erase A Record

Nov 26, 2014

// my size is not decreasing when I erase a record.
//dvr_hwch.cpp

#include <iostream>
#include <iomanip>
#include <cassert>
using namespace std;
#include "hash_chn.h"
void print_menu( );

[Code] .....

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C/C++ :: How To Clear Nested Stl Map

May 21, 2013

here is a nested stl map

typedef struct struct_RISCP {    
        float nSCPTotal;
        int nSCPCount;
        CString strIMEI;  
        std::map<UINT8, int> mapSection;    
    }RISCPSt;
map<stRncCellIdntyDmnType, RISCPSt>m_mapRISCP;

it occupied too much memory,i wanted to clear them(both outer map and inner map) ,some one told me you just need to call m_mapRISCP.clear(),then the mapSection (inner map) will be cleared automaticly,in other words, m_mapRISCP.clear() will clear both outer map and inner map.

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C++ :: Clear Screen Without Blinking

Nov 4, 2013

I have a one simple question :D. I want to output to the console some symbols. Let's say that i have a loop.

for(int i = 0; i < 10; i++) cou << "* ";

Then I want to output other symbols but I want to overwrite the previous symbols. I know I can use system("cls"); but it blinks if I try to output the same characters. For example if I have:

for(int i = 0; i < 10; i++) cou << "* ";
system("cls");
for(int i = 0; i < 10; i++) cou << "* ";

After I run this code the first loop outputs ten "*". Then there is a blink and there are again ten "*" shown. How can I avoid this blink?

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C++ :: Clear Part Of The Screen?

Nov 3, 2014

Is there any way I can clear only a selected part of the screen? (I'm aware of system("cls"))

For example, when you enter a date, and is wrong, could it just errase that input and only say "Wrong try again" without errasing everything else you where doing?

In this case, a function that only errases what is in the while

while(not wrong)
{
cout<<"DIA: ";
cin>>obj.dia;
cout<<"MES: ";
cin>>obj.mes;
cout<<"ANIO: ";
cin>>obj.anio;
}

PS: Also, is there any whay in which you can ask the user to enter the date DD/MM/YYY?

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C/C++ :: Clear First Character Of Array

Mar 26, 2014

I am trying to clear the first character of my array. The first two methods don't seem to work. The third method seems to but doesn't look like a good idea.

char operand[] = "abc";
//both methods seem to null it out
operand[0] = 0;
memset(operand, 0, 1);
printf("%s", operand);

//seems to work
memset(operand, 5, 1);

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C# :: Clear A Listbox From A Class?

Jun 5, 2014

I need to clear a listbox from a class other than the form where it exists. Why this isn't working? I'm getting no error messages when I compile and I am seeing the Console.WriteLine text I also added in the same function. I can call this function from within my form and it behaves as expected. I tried setting the listbox to public despite the fact I wasn't getting protection level errors but that made no difference.

Just to clarify what I'm doing here... I have a form that includes a panel of user controls from another class. So there is a listbox on OtherClass and the listbox is in MyForm. Heres my code:

MyForm

public void ClearListBox() {
Console.WriteLine("echo");
listBox.Items.Clear();
} OtherClass
private void listBox_SelectedIndexChanged(object sender, EventArgs e) {
MyForm mf = new MyForm();
mf.ClearListBox();
}

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C++ :: How To Clear A File At Beginning Of Program

Jul 28, 2013

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?

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C++ :: Clear Data From Char Array?

Feb 5, 2013

How to clear data from a char array?

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C++ :: How To Clear Exception Mask For A File

Feb 12, 2015

When creating an exception mask for a file, should an exception throw during a file operation, I can reset the state bits of the actual file using ios::clear().

Though after doing so, will the exception mask still throw an exception, thinking that the specified error state flags are still set to true? If so, how can I reset the exception mask so that it is ready to throw more exceptions should the appropriate situations arise in the future?

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C++ :: Osstream Doesn't Flush Or Clear

Dec 15, 2012

Code:
std::ostringstream ss;
ss.flush();
ss.clear();
ss << v.x;
std::string buff(ss.str());
XMLString::transcode(buff.c_str(), tempStr, 99);

[Code] ....

The buff at "Z" are stringed together with previous values. How do I resolve that?

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C++ :: Using Clear Device And Sleep Functions In Graphics

Dec 14, 2014

I have a college project which is a car racing game using C++ and the old-school graphics library BGI. After I draw the map and placed the objects(Car,obstacles,road's borders etc..)I added Sleep(); function to the function named Obstacles(); but the problem is, I can't move the car with the right&left arrows.a

Another problem,If I added a cleardevice(); command all objects disappears only the obstacles function keeps working. the Code is here:

char c;
do{
c = (char)getch();
if (c == KEY_LEFT) {
x = x - 10, x1 = x1 - 10;
} if (c == KEY_RIGHT) {
x = x + 10, x1 = x1 + 10;

[code].....

note: this is not the whole code, it's only a small portion of it, not a debugging question only need a hint how to fix it.

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C++ :: Clear Screen For Microsoft Visual 2010?

Jan 11, 2013

I checked through the net and most of the solution like clrcr(); is not working for microsoft visual 2010. SO i was wondering for those who was using the same ver of c++ as me how do you clear the screen?

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C# :: Datagridview Combobox Selection Clear After Adding New Row

Dec 25, 2014

I have 2 datagridview in one windows form, When I click row from datagridview1, it shows in datagridview2 (Select *from....). Also I have combobox column in datagridview2. My question is, when I select items in combobox, and click to new row in datagridview 1, datagridview2 combobox's is getting empty. it is my code:

private void dataGridView1_CellDoubleClick_1(object sender, DataGridViewCellEventArgs e) {
try {
int id = Convert.ToInt32
(dataGridView1.Rows[dataGridView1.CurrentRow.Index].Cells["id"].Value);//3

[Code] .....

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C# :: Clear White Space On Random Tile Map

Mar 14, 2015

I've got myself a 2d array

int[,] map = new int[100,100];

I've populate that will a bunch of 1's and 0's. The 1 represents a wall, and a 0 is dirt.

I'm looking for a way to clean up my blank spaces outside of my walls. Any algorithm I can use to identify these big areas and replace them with a '1'

for (int y = 1; y < map.GetLength(1) - 1; y++) {
for (int x = 1; x < map.GetLength(0) - 1; x++) {
// Inside here is where I was hoping to archive my work
bool draw = true;
foreach (Room room in rooms)

[Code] ....

Attached is an example of my output.As you will be able to see, there is a lot of brown. I want to fill the brown with walls, but leave space for a path between the rooms.The 'draw' bool is true when I'm outside of a room, just so I don't start throwing walls inside my room.

Example of what the array would look like (for those who don't know)

int[,] map = new int[100,100]
{
{0,1,1,1,1,1,0},
{0,1,0,0,0,1,0},
{0,1,0,0,0,1,0},
{0,1,0,0,0,1,0},
{0,1,0,0,0,1,0},
{0,1,1,1,1,1,0},
};

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C++ :: Clear Screen In Console - Change Text Color In EXE

Dec 28, 2013

How I can clear the whole screen in console...

And I'm using clrscr(); and its not working.

How i can change the text color in the .exe without using system function

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C/C++ :: Simple Calculator - Clear Screen Following User Input

Dec 10, 2014

I am working on a simple calculator in C++ .... All works fine with the calculator up until the requirement for the user to input "do you want to go again y/n" .... What i want to happen is the screen to clear down and reloop to the enter name part....but i can't get it to do that

Program Description: To write and develop a programme where a user can input a cost or price of something before VAT our program must then process the input number and must output the price with the original value plus VAT

#include <iostream>// I must use this to start my programming
#include <string> // I have added this for the extension task so the user has to input their name
#include <iomanip> // this is to manipulate the text
#include <stdlib.h>
using namespace std; // using the "using namespace std" shows that i will be using standard text throughout this programme

[Code] .....

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C :: Finding Percentages / If Statement / Clear Screen And Reloading Program

Nov 11, 2013

For my C programming module, I've been asked to create a program which is basically a ten question mathematics quiz or test if you like. Below is a copy and paste of my current, working program.

Code:

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
int main () {

[Code]....

I am also trying to include into my program; If the user achieves 4 or less marks in the test, they are asked if they would like to repeat the test (have a second chance).

I have been asked by my Lecturer to ask the Question; "Would you like to try again" and the response is 'Y' for yes, 'N' for no. Would this be shown by:

char Y = Y;
char N = N;
printf("Would you like another go?");
scanf(%d%, &Y, &N);

And finally; If the user would like another go, then I am trying to include the code that clears the screen and then reloads the program?

What code is used to clear the screen and no clue what code is written to refresh or reload the program. I assume it's a loop statement or some sort.

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C :: Getchar - Clear Input Buffer For Next Input Through Scanf

Aug 13, 2014

I would just like to know what does

while( (c =getchar())!='
' && c !=EOF );

do ? and how it do it?

I have see it in a example to clear the input buffer for next input through scanf but does not know its working clearly.

it is used in this example :

Code:
#include<stdio.h>
struct linklist {
char value[20];
struct linklist *next;
};
struct linklist *head,*curr;

[Code] .....

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C# :: How To Clear A Text Box With Old String And Replace With New String

Jan 22, 2015

I have a problem i have a textbox filled with info when the button is click but what i need to do now is when new info is place in the textbox i need the results textbox's to clear and the new info put in the textbox.

i know how to clear the textbox

txtVolume.Text = string.Empty;

But it just keeps the textbox empty.

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