C :: Srand Function Make New Numbers Every Time On Calling
Mar 6, 2015
How do i make the srand() function make new numbers every time i call it? Now it seems like it repeats its result over an over again.
Below is a program that should generate random numbers for 3 dices and print these out. But it prints out the same nr over and over.
Code:
#include <stdio.h>
#define MAX 100
int filler(int dice1[MAX], int dice2[MAX], int dice3[MAX]) {
int throws, nr;
printf("Define the number of throws");
scanf("%d", &kast);
[Code] .....
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Jul 31, 2014
My while loop is the problem. I want to use a non-recursive function to make the triangle number the sum of all whole numbers from 1 to N.
#include "stdafx.h"
#include <iostream>
using namespace std;
int triangle(int t);
[Code] ....
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Aug 11, 2014
I'm just starting to learn C++ with Jumping into C++. In Chapter 9, we are asked to create a coining flipping program. My code runs, but I can't figure out why it keeps printing tails. Not very random. My thing was that I can pick heads if the random number generated from rand() is even, and tails if it is odd. But it just keeps printing tails.
Here is my code:
Code:
#include <iostream>
#include <ctime>
#include <cstdlib>
using namespace std;
int rand_num;
[code].....
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Mar 9, 2013
Say I want to leave a program running and it stops when I press F9 for instance, I'm looking for something like (and note this is just a generalization).
#include blah
using namespace std;
/wait 2 hours
/key.press = F9
return 0;
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Feb 8, 2014
I'm making a program that would run 24/7 and that could be run on multiple computers that are all running Windows (the program would be in the startup folder of the computer).
So I'm searching for 2 functions, one that would check if the program has been already launched on this computer and another one that would do a save every 24 hours. but for the second one I don't know what I should do because I think that a loop with sleep() would take too much power for the cpu
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Dec 28, 2014
I've recently started creating a bingo caller application. I need in changing numbers to different text boxes. When a number is called it will be displayed in a text box and the last four numbers previous to that. However the oldest number needs to delete and for the remening numbers to move when a new number is called.
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Mar 19, 2013
I searched the web for error: C3867... and the discussions where murky or obscure.
My code excerpt is:
#pragma once
#include <windows.h>
#include <stdlib.h>
#include <process.h>
void PutUpfrmIO(void *);
namespace WordParsor {
[Code] .....
I get the generic message:
error C3867: 'WordParsor::Form1::PutUpfrmIO': function call missing argument list; use '&WordParsor::Form1::PutUpfrmIO' to create a pointer to memberc:userskingc++wordparsorwordparsorForm1.h... and the suggestion fix generate another error.
One person suggested the gcroot<> object wrapper... but I do not know how to modify/declair the function or its argument type.
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Jun 9, 2013
The function is supposed to return value from the file in my main, but I am getting empty value. I am trying to get better with pointer. Right now just teaching myself.
right now the only way for this code to show value is when in put the putchar(*ps) inside my readfile function. I would like to readfile to return value and print in the main function.
Code:
#include <stdio.h>
char *readfile(char filename[]);
int main(int argc, char *argv[] ) {
[Code].....
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Nov 10, 2014
Here is a sample of my question
class Base{
public:
int getNum();
private:
int numToGet;
}
class Derived: public Base {
public:
friend ostream& operator<<(ostream& output, const Derived &B);
[Code]...
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Feb 19, 2014
Is this possible?
int myfunc( int a, int b, char * c )
char a = "(int)myfunc()";
char b = "(int,int,char*)"
call(a, b, ...) // Function name and return type, params
I want to do function what registers forward what will get callback if the time is right. Basically then i dont need to edit and add extra functions into source files. I just have to include header and use register forward function. If there is anything close to this it would be perfect!
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Feb 5, 2014
This is my program i have to choose for random number between 1-25 and display them the program works perfectly just that every time i run its always the same numbers.
#include <iostream>
#include <cstdlib> // include library to use rand
using namespace std;
int main(){
int winner1; // declare variables
int winner2;
[Code] ....
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Sep 15, 2013
I am reading certain int's at a time from one int number stored in a file. I'll explain. I am working on an ezpass project and basically I have to store an int in a file, and from that file, write a program that separates numbers into information.
For example:
the number 204601324 is stored in a file. I know how to open a file from terminal, but the issue is reading the individual numbers. The first number is weight class (2). My program has to display that number as the Variable "weightClass." how do I get it to do that? In addition, miles allowed is the number "0460." How do I get that number to display as the variable "oMiles?"
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Jun 8, 2014
I have this sample code, that calls a function in a DLL. The function Callback is provided to the DLL as an argument, in order for the DLL to notify my program of relevant changes.
sample:
#include <iostream>
#include <conio.h>
#include <windows.h>
#include <winbase.h>
#include "TcAdsDef.h"
#include "TcAdsApi.h"
using namespace std;
void _stdcall Callback(AmsAddr*, AdsNotificationHeader*, unsigned long);
[Code] ....
I would like to change this code, so that there is a Main class that opens the connection and there are several separate classes (as below) that register themselves for a specific variable and get notifications if that value is changed. The reason for this is that I want to get several notifications for several independent events and I don't want them to mix. I figured this should look something like this:
class.h
#ifndef INACLASS_H
#define INACLASS_H
#include "Main.h"
class InAClass {
public:
InAClass(Main* mainClass, std::string iolocation);
[Code] ....
Unfortunately this gives me an error:
error: cannot convert 'InAClass::Callback' from type 'void (InAClass::)(AmsAddr*, AdsNotificationHeader*, long unsigned int)' to type 'PAdsNotificationFuncEx {aka void (__attribute__((__stdcall__)) *)(AmsAddr*, AdsNotificationHeader*, long unsigned int)}'
At first I thought this was because I don't have the namespace "using namespace std;" on top, but then I should be able to find something that specifically needs to come from the std namespace and is not marked as such. I don't want to rule the option out, but so far I could not find anything like that.
An alternative explanation might be that the Callback function needs to be global, but if I make it global, how can I distinguish between several Callback functions?
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Apr 24, 2014
The user thinks of a number from 0 to 100 and the program tries to guess it. The problem is, I'm new to random numbers and use a function to generate them that isn't my own. It generates the same numbers each time the program runs, here are screen shots:
Run 1: [URL] .....
Run 2: [URL] .....
I read something about seeding or something, if I need it, must don't give me the answer. If you have the liberty of time explain more to me about the random business.
Here is my code:
#include <iostream>
#include <cstdlib>
#include <iomanip>
#include <unistd.h>
#include <string>
#include <ctime>
using namespace std;
int rand_lim(int limit) {
[Code] ....
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May 20, 2013
one of my project involves loop inside loops and creating random numbers. Here is what I have so far:#include <iostream>
#include <string>
#include <cstdlib>
#include <ctime>
[Code]....
so the program will create a random value for the inflow. The idea is that the internal for loop will continue to run until the fill_level of the reservoir, which starts at 0, hits the capacity. The process of simulating how many years (each iteration of the internal for loop representing a year) is to be repeated 10 times by the parent for loop of the water_level simulation for loop.
The problem is that the random number that is supposed to created are the same number. THey are different every time I run it, but they are the same every time the loops repeat to make a new simulation.
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Aug 3, 2013
Every time I try to use the function SaveNewCD, it doesn't write to file correctly. It writes the ~, three characters, then goes into an infinite loop.
#include<iostream>
#include<fstream>
using namespace std;
int SaveNewCD();
int OpenCD();
int main() {
char ArtistName[25];
[Code] .....
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Jul 2, 2014
I am trying to call a function through a variable
The error
|error: no match for 'operator=' (operand types are 'std::string {aka std::basic_string<char>}' and 'void')|
|warning: statement has no effect [-Wunused-value]|
||=== Build failed: 1 error(s), 1 warning(s) (0 minute(s), 0 second(s)) ===|
#include <iostream>
#include <fstream>
[Code].....
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Apr 3, 2013
I am trying to use ofstream to write in a txt file in a function called recurrently. for a simplified example:
void func_write(double x) {
ofstream myfile;
myfile << "the result = " << x << endl;
} int main() {
ofstream myfile;
[Code] .....
To this stage, it does not work, because the myfile in func_write cannot write in the txt file opened in main function. I don't want to open, append and close the txt file each time the function is called, that will take more time to execute all (imagine with 500 calls).
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Dec 28, 2013
I want to call the array from one function to another all function not a main function
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Apr 6, 2012
I have a code like this below in /root_project/main.cpp:
Code:
#include "theoraplayer/TheoraVideoClip.h"
unsigned int tex_id;
TheoraVideoManager* mgr;
TheoraVideoClip* clip;
std::string window_name="glut_player";
bool started=1;
[Code] ....
and the TheoraVideoClip.h file is in /root_project/include/theoraplayer/.
Inside of TheoraVideoClip.h there is this:
Code: TheoraVideoFrame* getNextFrame();
And when I try to compile using g++ -o app main.cpp -lGL -lglut -lGLU -ltheora -ltheoradec -ltheoraenc I'm gettin this error:
main.cpp.text+0xac2): undefined reference to `TheoraVideoClip::getNextFrame()'
Ubuntu 11.10
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Oct 24, 2013
How would I call a string that sits within a switch loop in the main function, into a separate function?
Like this:
void statistics() {
cout << "Here are the statistics for your entry: " << endl;
cout << "
The size of your entry is " << s.length() << " characters." << endl;
}
I am calling string s from this:
switch (toupper(myChoice)) {
case 'A': cin.ignore();
cout <<"
Please enter your text: ";
getline(cin, s);
[Code] ....
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Feb 20, 2013
I have two functions bool check_key(string cKey, string eKey) and bool check_digit(char digit1, char digit2), and I have declared both of them globally (is this the right terminology?) right after the "using namespace std;" and right before the "int main(){".
In the first one, I called the second one . But it is giving me the error: "no match for call to `(std::string) (int&)' ".
Code:
bool check_key(string cKey, string eKey) {
if(cKey!="" && eKey=="") return false;
if(cKey=="" && eKey=="") return true;
if(cKey=="" && eKey!="") return true;
if(cKey.length()!= eKey.length()) return false;
bool flag=true;
[Code] ....
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Mar 18, 2013
make a time-in time-out fuction which extracts the no. of hours and minutes from a string entered by the user.
#include <iostream>
#include <fstream>
#include <string>
[Code].....
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Sep 12, 2013
I'm new to C/C++. I'm trying to make a program that's going to use the CBLAS libraries that I downloaded on BLAS. After fighting tooth and nail with VC 2005 (I downgraded on purpose because at one point I was desperate.) with regards to solving compilation errors and such and eventually it all compiled just fine.
The problem now is, I get the above mentioned error. It says: "Unhandled exception at 0x0040271c in Try.exe: 0xC0000005: Access violation reading location 0x4e18feb8."
Now there are a few .cpp files (I'm compiling as C code.) which contain the functions and there is one other one which contains my main method. Using the debugger, it goes through 3 files all in all.
The main file: Code: /* cblas_example2.c */
#include <stdio.h>
#include <stdlib.h>
#include "cblas.h"
#include "cblas_f77.h"
[Code] .....
I get the above-mentioned exception in the last line, or:
Code: cblas_dgemm( UNDEFINED, transa, transb, *m, *n, *k, *alpha, a, *lda, b, *ldb, *beta, c, *ldc );
The debugger tells me what the address in the exception is the address if *ldc.
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Dec 19, 2013
Expected output: 20
But what I got is: 22
Why. While calling sub function it should take the global variable am I right
insert Code:
#include <iostream>
using namespace std;
int a=0;
void sub()
[Code] ....
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Mar 7, 2014
Code:
const MenuData breakfast[NUMOFBREAKFASTITEMS] = {
{"Egg Breakfast", "Two eggs with a side of bacon and two slices of toast.", "", "2 Eggs, 2 Toats, 2 Bacons", "", 250.00},
{"Pancake Breakfast", "Three Buttermilk pancakes served with butter and syrup.", "", "Three Pancakes, Butter, Syrup", "", 200.00},
[Code]....
What I'm trying to do is call the printReceipt function in the main, but I'm doing it wrong. Here is my attempt.
Code:
printReceipt (const MenuData menu[], qty, info)
I've tried it many other ways but I keep getting an error. I tried researching it on the internet, but I don't get much info.
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