C/C++ :: Recursive Functions With Arrays As Parameters

Sep 21, 2013

I wrote a fuction in C with the prototype

'void raisePowerOf2(int array[],int pow);'

If someone want to find the value of 2^456 ,just have to invoke this function 456 as the value for pow and int array with 2 elements :1 & -1 as the argument for the array.(There I used -1 to denote the end of the array.)

But it seems that this function doesn't give the exact answer

And I tried this from java also,with the same implementation.It produced the answer precisely .

I tried for hours, but unable to detect reasons why this code blok in C doesn't work properly .

This is the code in c

#include<stdio.h>
void raisePowerOf2(int array[],int pow);
int main(){
    int a[2]={1,-1};
    raisePowerOf2(a,5);  
    return 0;
}  void raisePowerOf2(int array[],int pow){

[Code] ....

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C :: Recursive Functions With Arrays As Parameters

Sep 21, 2013

I wrote a fuction in C with the prototype 'void raisePowerOf2(int array[],int pow);'

If someone want to find the value of 2^456 ,just have to invoke this function 456 as the value for pow and int array with 2 elements :1 & -1 as the argument for the array.(There I used -1 to denote the end of the array.)

But it seems that this function doesn't give the exact answer

And I tried this from java also,with the same implementation.It produced the answer precisely .

I tried for hours, but unable to detect reasons why this code blok in C doesn't work properly

This is the code in c

Code:

#include<stdio.h>
void raisePowerOf2(int array[],int pow);
int main(){
int a[2]={1,-1};
raisePowerOf2(a,5);
return 0; }
void raisePowerOf2(int array[],int pow){

[Code]...

This is the code in java....

Code:

public class NewClass4 {
void raisePowerOf2(int array[],int pow){
final int len=array.length;
int store[]=new int[len+1];
int qtnt=0;
for(int i=len-1;i>=0;i--){
store[i+1]=(array[i]*2)%10+qtnt;
qtnt=(array[i]*2)/10;

[Code]...

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C/C++ :: Functions Passing Size Of Arrays As Value Parameters?

Mar 11, 2014

we were given this code:

// Music Shuffle Program
// This program takes an array of strings and randomly permutes their order.
// This allows us to generate new song shuffles.
#include <iostream>

[Code]....

or are they referring to something else?

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C++ :: Optional / Default Parameters In Class Functions?

Aug 19, 2014

In the thread "Making a argument optional to function", it is stated that to set default values for arguments of a function you can simply do so in the function definition, like:

int myfunc(int a, int b, int c=3) {...}

This then automatically puts c to 3 in the function body if a call like myfunc(1,2); is made, if I understood correctly. However, this does not seem to hold for class functions. For example, something like:

class classy {
public:
int class_func(int, int, int); // class function prototype
}
int classy::class_func(int a, int b, int c=3) {...}

fails to compile. What I would like is to be able to call class_func outside of this class (by including it as a header in another macro), optionally specifying c. If c is not specified in the call, it should use a default value.

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C++ :: Class Member Functions With Pointer Parameters?

Jan 30, 2013

Here is the assignment: (3pts) Given the following class header file, write the class’ source code for each of the accessor and mutator functions listed. (How the functions have listed their parameters, varying between passing by reference and by value.) Don’t forget to comment your code – it counts!

class Album {
private:
char * artist; // band or singer’s name
char * title; // title of the album

[code]....

The input will be an array. My questions: First, am I on the right track?

When using (char * a) for a function, for example, this is passing the address of a, correct? so then *artist=a; changes what the address of a points to?

also, the functions are bool when I would expect void. Why? for all of the set_" " functions, the parameter is *... but for set_record_label it is *&. That appears to be a mistake to me. Is that right?

what is the difference between *& and * as parameters?

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C/C++ :: Looping Recursive Functions?

Feb 10, 2014

how to recursively modify my program. The problem I'm hacing is the the program is not looping correctly and also not printing the correct number. I've calculated the payoff correctly, also I've only been able to print the first section of R3. I can't figure out how to loop it to get R2 to stay at 2 then go to 3 after all possiblities of R2 at 2. Enventually, R1 will change to 2 then 3; 3 being the highest number earned. To be mentioned that will be three recursive function loopR1, loopR2, and loopR3 for each column.

The result of the program should look like:

R1 R2 R3
1 1 1 payoff is 1
1 1 2 .......... 1
1 1 3 .......... 1
1 2 1 .......... 1
1 2 2 .......... 1
...
...
...
3 3 2 .............. 5
this is what I have so far:

#include <stdio.h>
#include <stdlib.h>
int payOff(int r1, int r2, int r3);
void loopR3(int R3, int upto);
void loopR2(int R2, int upto);

[Code].....

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C++ :: Functions Without Parameters - Compute And Print Total Number Of Products For Company

Mar 27, 2013

Summary: 6 companies have a product in 5 different warehouses. Each company is identified by a positive ID number and each warehouse is identified by a number (1 for the first, 2 for the second,…)

Object: the object of this assignment is to write a C++ program which asks the user to enter a company ID number, and the number of products in each of the warehouses. It then computes and prints the total number of products for that company

If the total number of product is less than 100, it prints the message “place a new order”

Input: for each company, its ID, and the number of products in each warehouse with appropriate prompt messages.
Example: Enter company ID number: 101
Enter number of products in warehouse #1:30
Enter number of products in warehouse #2:60
Enter number of products in warehouse #3:0
Enter number of products in warehouse #4:5
Enter number of products in warehouse #5:27
The total for company 101 is:122

Output: for each company, the total number of product, and the message “place a new order” if the total number of product is less than 100.

Method:
1. Define global variable, int total_prod to hold the total number of products for a company
2. define the function void compute_total() that uses a loop to read the number of the products in all warehouses for one company, computer the total number of products and store it into the global variable total_prod.
3. Define the function void new_order() that determines if a new order need to be placed as follows: if the total number of products (in the global variable total_prod) is less than 100, it prints the message “place a new order”
4. Your function main does the following in a loop:
- read a company ID number
- call function compute_total() to read the number of the product in all warehouses for that company, and to compute their sum
- print the total number of the product for that company with an appropriate message
- call the function new_order() to determine if a new order need to be placed.

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C :: How To Pass Arrays To Functions

Sep 23, 2014

I have read about it in my book and also on this website but i still have things uncleared....

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C :: How To Create Functions With Arrays

Jun 12, 2013

how to create functions with arrays :/

You have to write a single C program that creates a one dimensional array of size MAX(to be declared as a declarative constant using directive #define MAX 10), initializes its elements with a given value using the function InitArray, then populate the array with some random numbers between 1 and MAX inclusive, and finally search the array for certain keys.

The structure for this C program is as follows:

int main() {
//array A to be locally declared here
int
size = MAX;
}

[code]....

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C :: Passing Arrays Into Functions

Nov 4, 2013

i have a program that works, but now I am trying to get function1() to work. What it has to do is bring in the array and populate it with random letters. I don't know much about functions.

Code:

#include<stdio.h>
#include<stdlib.h>
#include<time.h>
#define maxrow 20 //defines maxrow as a constant of 20
#define maxcol 30 //defines maxcol as a constant of 30
}

[code]....

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C# :: Arrays In Functions And Variables

May 21, 2014

I'm truing to write a function that gets an array of arrays, and returns an array. I placed the code I'm using below, but I'm getting all kinds of errors. How is the right way to do this?

static void Main(string[] args) {
int[] draw1 = new int[] { 5, 8, 3 };
int[] draw2 = new int[] { 3, 6, 8 };
int[] draw3 = new int[] { 6, 7, 9 };
int[] draw4 = new int[] { 5, 6, 0 };

[Code] .....

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C/C++ :: How To Use 3 Functions To Sort 9 Arrays

Mar 31, 2015

I can write code that can sort arrays with Bubble, Selection and Insertion algorithms but I'm not sure how to have them be called and return a value 3 different times with 3 different sizes. For example, I need it to return 10, 100 and 1000 but I'm stuck.

#include <stdio.h>
void selectionSort (int list[], int last);
int main()

[Code].....

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C :: Implementation Of Histogram Using Functions And Arrays

Apr 12, 2013

I'm trying to code one of the problems but it really is hard to catch errors for a novice like me at first.

I have to Write a single C function for computing the histogram of a list of nonnegative integers into 4 bins.

The main() function first initializes a positive integer array called List of size N, takes 3 inputs from the user A, B, C (assume 0 < A < B < C), and declares a second integer array Bin[4].

The doBinning function should count the number of elements of List in the interval [0, A) and store it in Bin[0], count of [A, B) in Bin[1], count of elements in [B,C) in Bin[2], and the number of elements >= C in Bin[3]

Code:
#include <stdio.h>
#define N 10
#define M 4
int *doBinning (int source[], int dest[], int a, int b, int c);
int main (){

[Code] ....

Somehow I keep getting error from ptr = doBinning(List[], Bins[]. What am I doing wrong? Code might contain some errors.

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C :: Functions Which Change Arrays Without Pointers?

Jan 17, 2014

the book I learn from gave a task to write a program which gets a matrix , and we have to write a function that switches 2 columns or rows the user inputs .as far as I know a function can not change variables in the main function without using pointers .so , theoretically, can a function described here can be written without using pointers ? as far as I tried - it can not.

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C++ :: Declaring Parallel Arrays As Functions

Oct 23, 2013

i'm facing some problems with the array, as I have my .h and .cpp files so do i declare them as per norm of how we usually declare a function?

pointtwod.h
class PointTwoD {
private:
int xcord,ycord;
float civIndex;
LocationData locationdata;

[Code] ....

when i compile the error message i get was even when i i put in int xord[]; in my PointTwoD.h file:

PointTwoDImp.cpp:99:6: error: prototype for 'void PointTwoD::storedata(int*,int*,float*) does not match any in class 'PointTwoD'

PointTwoD.h:48:8: error: candidate is: void PointTwoD::storedata(int, int, float)

PointTwoDImp.cpp: 135:22: error: 'xord' was not declared in this scope
PointTwoDImp.cpp: 135:27: expected primary-expression before ']' token
PointTwoDImp.cpp: 135:30: error: 'yord' was not declared in this scope
PointTwoDImp.cpp: 135:35: expected primary-expression before ']' token
PointTwoDImp.cpp: 135:38: error: 'civ' was not declared in this scope
PointTwoDImp.cpp: 135:42: expected primary-expression before ']' token

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C++ :: Using Void Functions To Display Arrays

Nov 8, 2013

I want to write a code that gets three values from the user and puts them into three arrays. When the user enters -999, I want to print out a chart showing all the values they put in. This is what I have so far but it wont build. It tells me std::string is requested, but I'm not sure where to put it, and printArrays is declared void. How can I fix this?

#include <iostream>
#include <string>
using namespace std;
const int ARSIZE = 400;
void printArrays (string reportTitle, int levelsArray[], int scoresArray[], int starsArray[], int i);

[Code] ....

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C++ :: Passing Structure Arrays To Functions?

Oct 31, 2013

Description: Use functions and structures to simulate storage in a warehouse

*/
#include <cstdlib>
#include<iostream>
#include<cmath>
#include<iomanip>
#include<string>
using namespace std;
struct Bin {std::string name; int Quantity;}; //create a structure for "Bin"

[code].....

I keep getting a linker error on every function. what am I doing wrong?

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C++ :: Passing Char Arrays Between Functions Of Same Class

Nov 16, 2013

I'm having trouble with passing a character array between functions of the same class. I have a function, buildGraph, that calls function getNextLine. The getNextLine essentially just retrieves the next line of an input file and stores it into a "char line[80]". However when I try to use "line" in my buildGraph function, it has nothing in it.

Here's my code:

Class
#define NUMNODES 10
using namespace std;
#pragma once
class Prog3Graph

[Code] ....

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C++ :: Globally Declared Arrays Accessed By Multiple Functions

Mar 15, 2013

I currently have globally declared arrays, which are accessed by multiple functions. I want to turn the program so that the arrays are no longer globally declared, but are passed to functions by reference.

I have one problem with passing the arrays: I found that, through debugging, I HAVE TO resize the array when I pass it by reference. For instance, I was using int a[10] when it was globally declared, when it is passed by reference with size 10, it does not work, instead it should be higher than 10 (certain number). Why is this happening? I do not get it...

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C++ :: Passing / Returning Character And Integer Arrays With Functions

Jun 21, 2013

Passing and returning character and integer arrays with functions using simple programs...use pointers if necessary

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C :: Number Of Utility Functions For Two Dimensional Arrays Of Integers Or Matrices

Nov 7, 2014

I am working on a number of utility functions for two dimensional arrays of integers, or matrices. However I am having a problem with segmentation faults, most likely due to errors in using malloc in functions like copyMatrix.

Code:
matrix_utils.h~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//This function checks if two matrices are equal
int isEqual(int **A, int **B, int n);

//This function returns one row of a matrix
int * getRow(int **A, int i, int n);

//This function returns one column of a matrix
int * getCol(int **A, int j, int n);

[Code] ....

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C :: Functions That Declare Arrays In Function Input Even Though Already Declared In Main

Mar 6, 2015

I have seen functions that declare arrays in the function input even thou the arrays is already declared in main. Why do you do this?

For example:

int ova(int antal, char glosorSv[][MAX], char glosorEn[][MAX])
int main(void)

char glosorSv[][MAX]
char glosorEn[][MAX]

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C/C++ :: How To Access Linked List Functions From Stack Class Without Functions

Mar 20, 2014

I'm a little confused by my programming assignment this week. I've been working at it Wednesday and I've made progress but I'm still confused as to how I'm supposed to do this. The class I made is called Stack, and it's derived from a template class called StackADT. We also utilize a class called unorderedLinkedList, which is derived from a class called linkedList.

We're supposed to implement all of the virtual functions from stackADT in the Stack class. The Stack data is stored in a an unorderedLinkedList, so what I'm confused by is how to implement a few of the Stack functions because there are no functions in unorderedLinkedList which we could call to manipulate the data.

As you can see from my attached code, I'm really confused by how I'm supposed to implement the pop() and top() functions, and I also think my initializeList() function is wrong. We don't have any similar functions in unorderedLinkedList to call, so I'm at a loss of how i'd access my unorderedLinkedList. My initial thought was to call the similar functions in the class that unorderedLinkedList was derived from, linkedList, but I'm unsure of this is what we're supposed to do, or if theres actually a way to access my unorderedLinkedList without having to use the functions from the base class.

NOTE: We're not allowed to modify stackADT, unorderedLinkedList, and linkedList.

Stack.h

#include "stackADT.h"
#include "unorderedLinkedList.h"
template<class Type>
class Stack: public stackADT<Type>{
template <class T>
struct nodeType
{
T info;
nodeType<T> *link;

[Code]...

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C/C++ :: Array Of Functions Pointing To In Class Functions With Arduino

May 3, 2013

At the moment im trying out with pointing to an array of functions. I got this working as following:

typedef void (* functionPtr) ();  
functionPtr functions[2][2]={{do11,do12}, {do21,do22}};    
void do11(){DEBUG_PRINTLN("11");}
void do12(){DEBUG_PRINTLN("12");}
void do21(){DEBUG_PRINTLN("21");}
void do22(){DEBUG_PRINTLN("22");}    
void loop(){
         A=0;
         B=1;
         functions[A][b]();
}  

But now I'm trying to use this to point to a function inside a class so instead of do11, i want to be able to point to Basic.Do11. Somehow this doesnt work and I keep on getting this message:

error: argument of type 'void (Basic::)()' does not match 'void (*)()'

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C# :: How To Set Parameters For Randomizer

May 15, 2014

I am creating sets of list for rotational schedule. I read that to create a randomizer is by using Randomize() function. What i want to ask is how do you set the parameters? what function should i use?

for example:
1. there are three list of the same type.
2. the range are 1-100 and a-z. (can i use 1-100 instead of writing all of the range?)
3. i need seven of each range (example: 3, 42, 78, 11, 89, 64, 22, a, n, y, e, t, d, j) for each list.
4. the three list will be generated 52 times
5. (this is the hardest part) the range must be distributed equally first, before repeating the range. For example: if the number 4 is to be used again, it must wait for other number to be on the list. The same goes for the alphabet.

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C++ :: Sending Constants As Parameters

Nov 21, 2013

What's the problem with the following:

Code:
#define K 3;
int max(int a, int b) {
return a>b? a : b;
} int main() {
cout<<max(K, K+3);
return 0;
}

Why is it not allowed, and how is it different from:

Code:
int max(int a, int b) {
return a>b? a : b;
} int main() {
cout<<max(3, 3+3);
return 0;
}

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