C :: Declaring And Initializing 3000 Number Array?
Oct 23, 2013
Here are the steps to this program:
1. Declare an array that will hold 3000 numbers
2. Initialize this array by assigning a random number to each element in the array
3. Traverse the array, modifying the current contents of each element in the array so that each value now lies between -3000 and 3000 inclusive
4. Traverse the array to compute the average value of all elements
I have never worked with arrays before and am lost!
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Jan 23, 2012
I'm picking up C++ by translating java code to C++. I have the completed code in java and it works perfectly. I'm not going to paste the whole code, this is a part of what I have:
Code:
class Graph
{
final int MAX_VERTS = 20;
[Code]....
I know it looks almost exactly the same as its java counterpart. I have several sources opened, but it's all bits and pieces of what I need.
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Oct 23, 2013
I have this array which holds 3000 numbers and is initialized by assigning a random number to each element.
Code:
#include <stdio.h>
#include <stdlib.h>
int main (void)
{
int x[3000] = {rand()};
return 0;
}
I have to traverse this array so that each random value lies between -3000 and +3000 inclusive.I'm not sure how to traverse this, there is nothing in my notes discussing traversing.
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Feb 9, 2013
I'm creating a program to read information about class schedules at my school, reformat the information, and allow the user to search for specific semesters. There are eight fields of information. I'm reading the info from a text file using eight parallel arrays, but I'm having trouble declaring the arrays. I can run this code in one compiler (Dev-C++) with no problems, but I get errors when trying to compile it using Visual Studio stating that arrays must be declared with a constant value. I have a loop to run through the text file, with a counter to increment with each subsequent line, then I create a constant int equal to the counter, and declare the arrays of size equal to the constant int. Here's the section of code in question:
// Counting the number of lines in the text file
inFileForLines.open("CIS225HW1DA.txt");
string countLine;
int numberOfLines = 0;
//Discarding the first line of the text file containing only column headings
getline(inFileForLines, countLine);
[Code] .....
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Apr 4, 2013
Code:
if (IS_LEAP_YEAR(year))
const int days_per_month[] = {0, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
else
const int days_per_month[] = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}; Is it ok to declare the array in this manner or is it bad?
And i have to ask the user for a date to enter in my program. So should I use scanf or should I store the date in a string and then use sscanf. I have to check for valid input for everything like day, month, year etc. I did it as below..
Code:
int assignments;
assignments = scanf("%d / %d / %d", &month, &day, &year);
fflush(stdin);
if (assignments != 3)
{
printf("Retry: ");
}
else
error checking.
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Jun 30, 2014
We have been assigned to create an iTunes library. Everything compiles in my other .h file but my main is not happy with my object declaration. It keeps stating "primary expression before '{'". Here is my main code:
#include<iostream>
#include<string>
#include<fstream>
#include"myTunes.h"
using namespace std;
//function protocols
void read(string);
[Code] ......
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Mar 18, 2013
I'm writing this program that basically interprets the rottentomatoes website. I am however having a problem declaring if it is rotten or fresh according to the rating the user enters.
I'm outputting it here:
void PrintAll(const string titles[], const int ratings[], int count) {
WriteLine('=', 50);
cout << "PRINT ALL" << endl;
WriteLine('-', 50);
[Code] .....
And here is my condition:
string RatingToString(const int ratings[], int count) {
string rank;
for(int i = 0; i < count; i++) {
[Code]....
Here is the output:
1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950
==================================================
MENU
1. Add Movie
2. Print All
3. Exit
--------------------------------------------------
Enter 1-3 : 1
Title : Hitch
Rating : 90
==================================================
[Code]....
My condition works when there is only one movie, but when I add more, it gives it the new movies "ROTTEN" or "FRESH" rank.
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Oct 29, 2013
I have the following code:
struct mystruct {
char fieldA[5];
char fieldB[7];
};
void dosomething(struct mystruct* pms) {
[Code] ....
Is there any problem doing that, even for a C89/90 compiler?
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Oct 21, 2012
I can not set the size of my array while running porgrama. Is there any way to do this in C + +?
---- code ------
#include <iostream>
#include <string>
using namespace std;
[Code].....
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Sep 14, 2013
I have a function
Code:
int exec_program(char * arguments[])
{
...
}
I can call it like this without a problem:
Code: char * uselessvariable[] = {"/bin/echo", "Testing", NULL};exec_program(uselessvariable);
However I get an error if I try to compile it like this:
Code: exec_program({"/bin/echo", "Testing", NULL});
How, in c, I can put this array inside of the argument in one line without having to name a new variable name?
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Dec 1, 2014
is it possible to use this code ?
#include <iostream>
int main(int argc, const char * argv[]) {
int number = 0;
std::cout << "napis cifro za array
";
std::cin >> number;
[Code]...
It does work on xcode but doesn't in microsoft visual studio 2013. Where is the problem?
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Apr 18, 2013
class Hallway {
private:
//---------------------------------------------------------------
// DO_04: Declare a Light array of size MAX_LIGHTS
// Hint: look through the methods below to find the name to use
// for the array
//---------------------------------------------------------------
int numLights;
int lights[MAX_LIGHTS];
[Code] .....
I keep getting the error " this.lights[i] is not a struct or class and so you cannot use '.' " on line 34.
How am I supposed to define my lights[] array? I can't modify anything except directly after each comment block.
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Mar 6, 2015
I am making a tictactoe program that requires me to have a 3 by 3 two dimensional array of integers, in which the constructor should initialize the empty board to all zeroes. The program complies, but it keeps outputting garbage values and i'm not entirely sure why, My print function isn't complete yet, since I want to print out the array in a tic tac toe format, but i'm more concerned with why it's printing garbage values, here is my code:
Code:
// header file
#include <iostream>
#include <array>
[Code] ....
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Feb 25, 2014
How to initialize this array of structures in my code
struct CustomerAddress; {
string street;
string city;
string state;
int zip;
[Code] ....
I am going to be using a boolean variable to mark whether or not a specific field has had data entered into it. I figure the best way to do that is to initialize all the elements of the structures to 0. However, with strings and with the nested structure, I'm not sure how to do this.
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Aug 1, 2013
How to initialize double pointer array..?
int (**aLines)[2];
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Dec 29, 2013
is it possible to create a dynamic array with all entries in it equal to 0?
int** adjMatrix;
adjMatrix= new int*[numOfVertices];
for(int i=0; i<numOfVertices; i++){
adjMatrix[i]=new int[numOfVertices];
}
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Jul 31, 2013
Want to initialize a local one dimensional array. How can I do the same without a loop?
Found from some links that
int iArrayValue[25]={0};
will initialize all the elements to ZERO. Is it?
If yes then can we write below code to initialize the elements to a non-ZERO value?
int iArrayValue[25]={4};
Do we have some other way to initialize an array to a non-ZERO value? Memset can initialize the element to ZERO.
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Nov 15, 2014
In one of my programs I have a 3x3 array of string that I use to display the outcome to rock, paper, scissors, and another 1x3 used for a number guessing game. I have the arrays declared in the header file as follows:
//Games.h
std::string rpsOutcome[3][3];
std::string hiLoOutcome[3];
and then initialized them in the cpp file:
//Games.cpp
string rpsOutcome[3][3] {
//row 1
{ "Both of you picked rock, you tied. Try again",
"You picked rock, the computer picked paper, you lose",
[code]....
From what I've read, Im pretty sure thats how your supposed to initialize multidimensional arrays (using the nested braces), but when I build the project, I get the following error:
123456789101112
1
1> RockPaperScissors.cpp
1> Games.cpp
1>c:userswuubbgoogle drivevisual studio projectsgamesgamesgames.cpp(75): error C2374: 'games::rpsOutcome' : redefinition; multiple initialization
[Code] .....
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Nov 26, 2012
Why I get a crash when initializing the indices array below (bottom)-
Code:
struct TerrainGroupData {
TerrainGroupData(){};
TerrainGroupData(Ogre::Vector3 ** iVertices, unsigned long ** iIndices, size_t* iFaceNum, size_t* iVertNum) {
vertices = iVertices;
indices = iIndices;
[Code] ...
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Mar 8, 2015
I am making a tic tac toe program in which they are asking me to have a 3x3 2 dimensional array of integers and have the constructor initialize the empty board to all zeros. They also want me to place a 1 or 2 in each empty board space denoting the place where player 1 or player 2 would move The problem I'm having is, my code initializes the board to all zeros for each element of the array, and prints it out just fine, but I can't figure out how to re-initialize the values in the array to show where each player moves on the board... I was thinking about having a default constructor that has each value set to zero, and then use a setGame function that can change the values on the board to one or two depending on where the player moves....but I don't know if that's possible.....
here is my code
Code:
// header file
#include <iostream>
#include <array>
class tictac {
public:
tictac(int);
[code]....
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May 10, 2013
I am new to C. I've been trying to use C to code some statistical functions originally coded in R. I've encountered an interesting phenomenon. In the function foo1, I declared the array v1v2b using an actual value 1999000. The function runs fine when I call it in R.
Code:
void foo1(double *x, double *y, int *nsamp){
int i, j, k, oper=2, l;
double* v1v2=malloc(sizeof(double)*((*nsamp)*(*nsamp-1)/2 + 1));
outer_pos(x, y, nsamp, &v1v2[0]);
double v1v2b[1999000]; //<-------HERE
for(i=1; i<= 1999000]; i++){
v1v2b[i-1]=1;
} }
However, in foo2, I first create an integer variable called index, and store the value 1999000 in it. I then use it to initialize the same array. When I tried calling this function in R, it either led to a stack overflow error, or completely crashed R.
Code:
void foo2(double *x, double *y, int *nsamp){
int i, j, k, oper=2, l;
double* v1v2=malloc(sizeof(double)*((*nsamp)*(*nsamp-1)/2 + 1));
[Code] .....
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May 24, 2013
I am having following pointer variable declaration
Code: Static double (*funcs[]) (double) = { sin,cos,tan,asin,acos};
Here funcs is an array of pointers to functions which take double as input and gives double as output with static as storage type am I right.
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Nov 24, 2014
I'm learning OpenGL using the C API and some of the functions' argument types have proven a bit challenging to me.
One example is the function Code: glShaderSource(GLuint shader, GLsizei count, GLchar const** string, GLint const* length); It resides in foo() which receives a vector "data" from elsewhere Code: void foo(std::vector<std::pair<GLenum, GLchar const*>> const& data); To pass the pair's second element to glShaderSource's third argument, I do the following:
Code:
GLchar const* const source[] = {data[0].second};
glShaderSource(..., ..., source, ...);
Now I have two questions regarding this:
1. Can I initialize a char const** via initialization list, the way I do a char const*?
Code:
// this works
std::vector<std::pair<GLenum, GLchar const*>> const shader_sources = {
{GL_VERTEX_SHADER, "sourcecode"},
{GL_FRAGMENT_SHADER, "sourcecode"}
};
// but is this possible?
std::vector<std::pair<GLenum, GLchar const**>> = { ??? };
2. Is there an alternative to creating a temporary GLchar**, even though that's specifically what the function wants?
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Nov 7, 2014
InitializeNArray<4, bool, NARRAY>()(narray, {1,2,3,2}, true);
is supposed to initialize a 4-dimensional std::array a with a[1][2][3][2] = true.
The commented-out line, which is the desired recursion, does not compile for some reason, and the problem third parameter cannot be deduced. So I placed some temporary lines to work in the special case only. Howw to make that recursion work?
#include <iostream>
#include <array>
#include <vector>
#include <memory>
template <typename, int...> struct NArray;
[Code] ....
Incidentally, this is a sub-problem within the task of initializing more generally with
template <typename T, int... N, typename... ARGS>
typename NArray<T, N...>::type NDimensionalArray (const T& value, ARGS&&... args)
Once this subproblem is fixed, then the bigger task is fixed too.
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Apr 28, 2013
I want to use this array as part of my class. I have tried several different angles trying to get it to work but with out success. I have been checking to see if it works by simply using "cout << dayName[3];" It is printing nothing at all. What is the proper way to initialize this array of strings?
First I tried this:
const string dayName[] = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};
then I tried this:
const string dayName[7];
dayName[0] = "Sunday";
dayName[1] = "Monday";
dayName[2] ="Tuesday";
dayName[3] ="Wednesday";
dayName[4] ="Thursday";
dayName[5] ="Friday";
dayName[6] ="Saturday";
My implemetation file code and my header file code is here (header first):
//dayType.h, the specification file for the class dayType
#include <iostream>
#include <string>
using namespace std;
class dayType{
[Code] .....
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Mar 20, 2015
I am not getting any error below
--------
#include <iostream>
using namespace std;
void main()
{
char sqr[3];
sqr[0] = '1';
sqr[1] = '1';
cout << sqr[0] << sqr[1];
while (1);
}------------
but if I move my char type array before main , I get error l
----------------------------
#include <iostream>
using namespace std;
char sqr[3];
sqr[0] = '1';
sqr[1] = '1';
void main()
{
cout << sqr[0] << sqr[1];
while (1);
}
-------------------
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