How can I pass an array of struct by reference ?
example :
struct Coordinate {
int X;
int Y;
};
SomeMethod(Coordinate *Coordinates[]){
//Do Something with the array
}
int main(){ ...
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guyz i need to pass an integer array from lex to yacc.i know v can pass an integer using union of yylval but how to pass an array ...pls help me
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/*
* PURPOSE
* Search if a string contains a string and print it out from there
*/
#include <stdio.h>
void searchHaystack(char cHaystack[], char cNeedle[]);
void showResult(int iOffset, char ...
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I made a merge sort function:
void mergeSort(int emotionCount[], int low, int high){
int i=0,k=0;
//I did this to see the value inside the array, and ...
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I have a small bit of existing C code that I want to wrap using Cython. I want to be able to set up a number of numpy arrays, and then ... |
I cant figure out where I am messing up. I am passing an array of character pointers. Inside the function I am trying to use strtok to break up a string ... |
This has been bugging me for some time, for example, if I'm trying to write this code:
// find the length of an array
#define ARRAY_LENGTH(arr) (sizeof(arr)/sizeof(int))
// declare an array ...
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I wrote a function containing array as argument.
And call it by passing value of array as follows.
void arraytest(int a[])
{
// changed the array a
a[0]=a[0]+a[1];
a[1]=a[0]-a[1];
a[0]=a[0]-a[1];
}
void main()
{
int arr[]={1,2};
printf("%d \t %d",arr[0],arr[1]);
arraytest(arr);
printf("\n After calling fun arr ...
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I (think I) understand that you can only retrieve the size of an array (using sizeof) if it is declared at compile time on the stack, e.g.
int my_array[] = {1,2,3};
sizeof(my_array) == ...
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P: n/a CapCity I'm sure I'm missing something simple - I do not code in C regularly, and the breaks are long enough for me to forget. The situation I have is I need to create an array but I do not know the dimension until runtime. I pass the pointer to a function which then determines the size and then ... |
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The snippet you posted won't compile. > -- Ian Collins. Sorry! That piece didn't initialize an array of chars. it's basically this: #include #include void DoThang (char (&cMovesDone)[9]) { for(int i = 0; i<9; i++) cMovesDone[i] = 'k'; } int main() { dpl_DosGraphixEnable(); char c[9] = "aaaaaaaa"; DoThang (c); cout< |
Hi all, I am at the point in my programming career where I am starting to build some more advanced programs. I typically program for the purpose of doing molecular modeling and therefore almost all my programs have an array of cartesian coordinates, i.e. atoms[natoms][3]. So, what I am doing now is, I wanted to have a function that I send ... |
Hi, I have a problem with the following code, which doesn't compile on the MSVC8 compiler. CReportScreen derives from CDialog // although this probably has nothing to do with it HBITMAP is a typedef for an int CReportScreen(CWnd* pParent = NULL, HBITMAP bmpArray[3]); CReportScreen::CReportScreen(CWnd* pParent , HBITMAP bmpArray[3]) : CDialog(CReportScreen::IDD, pParent), { } then i instantiate the CReportScreen as follows : ... |
Hi all, I have to pass an array of doubles to a legacy C function that copies some data using memcpy. The code would look like this: extern "C"{ void legacyCFunctionFill(void* arg); } .... int number=5; double *my_array=(double*)calloc(number,sizeof(double)); legacyCFunctionFill((void*)my_array); // Do sth useful free(my_array); The question is: if I change calloc() and free() with new and delete [] will there be ... |
On Jul 25, 1:35 am, xon...@yahoo.com wrote: I get the error: "error C2664: 'C::C(T **,int,int)' : cannot convert parameter 1 from 'float [2][3]' to 'float **'" An array of array does not get resolved to a pointer-to-pointer? No. Why should it? An array is converted implicitly to a pointer, but the result of that conversion is a pointer, not an array, ... |
Good evening, I would like to pass the size of an array from the commandline. int main(int argc, int *argv[]) { .... max=*argv[1]; int list[max]; .... This does not work, because the size should be a constant. How can I work around this? I tried const or static, nothing works. Thank you, Ernst |
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Thomas Kowalski schrieb: Hi everyone, recently I have trouble to pass an array (unsigned char color[3]) to a methode by reference and collect the return value by reference. > I wanted something like: unsigned char[3]& changeColor(unsigned char[3]& color); If you pass the array to the function by reference, why do you wnat to return it as a reference as well ? ... |
danbraund@gmail.com Hi everyone, I'm a long time C coder, who is coding his final year project in C++ to run under the MIT click routing system. Being fairly new to the OO side of the language, my problem is this: In C++, how can I define a global array whose size is determined by parameters passed to a class? The array ... |
#include #define ARRAY_MEMS(xx_a) (sizeof(xx_a)/sizeof(xx_a[0])) void print_one(int idx, float a[][9], int x,int y) { int j,k; printf("idx = %6d\n", idx); for(j=0; j |
I have no idea why and what is [3] when passing with array a[]. Thanks. Code: /* Fig. 6.21: fig06_21.c Initializing multidimensional arrays */ #include /* --------------------What does [3] means?*-------------------*/ void printArray( const int a[][ 3 ] ); /* function prototype */ /* function main begins program execution */ int main( void ) { /* initialize array1, array2, array3 */ ... |
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i am re-writing the FMT linux command i assign a value Linesize then read in charecters without breaking up words. i have a function that checks if the last char in the line is a space it returns else it goes back charecters until space is found in char array but how do i input the newline(\n) at that place in ... |
I'm having trouble transferring my transposed array to my print subroutine. I could really use some help. Code: #include float transposeMatrix (int input_row, int input_col, float input_matrix[][20]) { int row; int col; float tran_matrix[20][20]={0}; for (row=0; row<=input_col; row++) { for (col=0; col<=input_row; col++) { (tran_matrix[row][col])=(input_matrix[col][row]); } } return tran_matrix; } void printMatrix (int input_row, int input_col, float input_matrix[][20]) { int ... |
Can Anyone Help Me Figure Out What I'm Doing Wrong. If you cost post the correction or and example I would appreciate it greatly. I have posted all the criteria to the assignment below. Assignment Write a program which prompts the user to enter the number of values to process (a maximum of 100). Next prompt, and allow the user to ... |
I am having some serious issues trying to pass the elements into the array at the end of the code segment. but i dont understand why, it prints them just fine but for some reason instead of printing them i want them into an array, but i just get a seg fault when i try to assign them to the array. ... |
OK here is pretty much my code: Code: #include //common defines and macros #include "derivative.h" //derivative-specific definitions #include "ADC.h" //allows convenient use of ADC #include void DisSensors(int SampleSize, int OnThresh, int OffThresh, int* result, size_t size); void main(void) { int DS[3]; //Distance Sensors int PS1=0, PS2=0, PS3=0, PS4=0; //Photo sensors int i; int average=0; EnableInterrupts; ADCInit(); //initialises the ADC ... |
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well, what i want to do is pass 2 arrays to another program so it can do any sort of operation with them using exec(), i tried using a memory allocation but now i dont know how to send it, and then how does another program use what it gets. -------------------------------------------------- Code: #include #include struct memoria { int i,j,m,n,h1,h2; int *mat1; ... |
Hello, I'm taking a C class, and stuck on an assignment. I know the prog has a few more kinks in it, but I've hit a wall. In the func read_into_array(), **line_array is supposed to get filled by values read in from a file. When I do a printf of it, each element has the last value read in from the ... |
Hey all, I'm at the part of my course where I am being taught arrays, and passing them to functions. I have been asked to produce a program that has 2 arrays that the user enters 10 numbers in and then gives the total for each array. So far i've come up with this : Code: #include #include #define ... |
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memset is not able to do this. As far as I'm aware, there is no generic function in C that would copy a block of memory x number of times. You can of course write a function that takes the relevant char * arguments and duplicates it the necessary number of times. You could for example use a loop using memcpy(). ... |
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/*Digital low pass filter including threshold monitor*/ Int16U filterReading(float **filterStore, Int16U adcr) { //Shift values along to make room for new readings for(char i = 0; i < FILTER_STORAGE_SIZE; i++) { (*filterStore[i+1]) = (*filterStore[i]); } (*filterStore[0]) = (((adcr*0.05) + ((*filterStore[1])*0.05)+((*filterStore[2])*0.05) + ((*filterStore[3])*0.05)+((*filterStore[4])*0.05) + ((*filterStore[5])*0.05)+((*filterStore[6])*0.05) + ((*filterStore[7])*0.05)+((*filterStore[8]))*0.05) + ((*filterStore[9])*0.05)+((*filterStore[10])*0.05) + ((*filterStore[11])*0.05)+((*filterStore[12])*0.05) + ((*filterStore[13])*0.05)+((*filterStore[14])*0.05) + ((*filterStore[15])*0.05)+((*filterStore[16])*0.05) + ((*filterStore[17])*0.05)+((*filterStore[18])*0.05) + ((*filterStore[19])*0.05)); return (Int16U)(*filterStore[0]); } ... |
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// declare var bmp_image img; rgb_pixel (*pixels)[hdrs.header.imageHeight]; // allocate memory pixels = ( rgb_pixel (*)[hdrs.header.imageHeight] ) malloc ( sizeof ( rgb_pixel ) * hdrs.header.imageWidth * hdrs.header.imageHeight ); // we get pixels from bitmap and put them into pixels array readBmpRGBImageArray ( filename , hdrs , pixels ); // set img.RGBPixels to pixels array img.RGBPixels = pixels; |
#include #include int st_dev(float a[]); int main() { float numbers[20]; int count; printf("Enter 20 Numbers: "); for (count = 0; count < 20; count++) { scanf( "%d", (numbers + count)); } st_dev(numbers); } int st_dev(float a[]) { float total; for (int i = 0; i < 20; i++ ) { total = total + a[i]; } printf("%4.2f\n", total); return ... |
More trouble passing arrays Hi, I have been trying to get my head around arrays, though i understood it but have tripped over again with multidimensional arrays. Code: int main(int argc, char *argv[]) { int num_roads = argc - 1; /* to change by 1 later !!!!!! */ /* To create an integer array from the input char array */ int ... |
#include #include void func1(); int func2(int *array); int main() { func1(); return 0; } void func1() { int i; int array[10]; func2(array); for (i = 0; i < 10; i++) { printf("%d\n", array[i]); } } int func2(int *array) { int i; for (i = 0; i < 10; i++) { array[i] = i; } return *array; } |
46. pass 3D array cboard.cprogramming.com |
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I'm writing a C program and I need to pass an array with 2 dementions to a function, but I don't know how to declare it as an arguement in the function parameters.... I'll pass, depending, either element "catagory[0]" or "catatory[1]", both have 5 elements in the 2nd demention, but within the function I need to be able to access either ... |
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passing an array of structeres... Sorry for keep posting, but I keep doing something wrong with this program. I am passing an array of structures and this is the error I am getting when tell it to pass. --------------------Configuration: program1 - Win32 Debug-------------------- Compiling... program1.c C:\programming\program1.c(43) : error C2059: syntax error : ']' C:\programming\program1.c(56) : error C2059: syntax error : ']' ... |
I'm having some trouble figuring out how to pass arrays. I need to write a function with 3 parameters: a,b,i. A and B are char arrays. The parameter i is an int. The function inserts the string a into b immediately after index i. Assume b is large enough to hold the added characters. So an example of what I'm trying ... |
The calling function will have the array name, only: someFunction(myArrayName); The receiving function will need a bit more: void someFunction(int ArrayName[50]) { In C we use array names as const pointers to the base of their array, and arrays are always passed by pointers - C never copies the entire array contents into a called function. Makes sense? |
I have a problem that I may be over complicating. I have to write a kernel IOCTL that will read 32 32-bit values from a bus and put them in an array/data type to be returned to the caller of the IOCTL up in user space. The mechanism for defining these IOCTLs requires me to provide the type of the argument ... |
The last example could be sort of accomplished by wrapping the array in a structure. ANSI C knows how to do a structure assignment. The first case would be better served by passing a normally declared static const initialized structure. Anything initialized at runtime will be larger and slower than a static const |
> When an array is passed to a function it 'degrades' to a simple pointer But the rule only runs for one level, it is not recursive. http://c-faq.com/aryptr/pass2dary.html Given char map[10][3], you end up with a pointer to char[3], not a pointer to a pointer to a char. A pointer to an array is not the same thing as a pointer ... |
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assign6.cpp:25: error: declaration of `cost' as multidimensional array must have bounds for all dimensions except the first assign6.cpp: In function `int main()': assign6.cpp:25: error: too many arguments to function `void readGraph()' assign6.cpp:33: error: at this point in file assign6.cpp: At global scope: assign6.cpp:41: error: declaration of `cost' as multidimensional array must have bounds for all dimensions except the first |
Ok, what you are saying is that when I pass a string (array of char) to a function: # include void StrCpy(char ar0[], char ar1[]) { for (int i=0; i<9; i++) { ar0[i] = ar1[i]; } ar0[i] = '\0'; } int main () { char carray0[10] = "String to go"; char carray1[10]; StrCpy(carray1, carray0); cout << carray1 << '\n'; return ... |
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I'm doing a music database project and I'm having a hard time with catching and manipulating the parameters being passed. Am I even close ?? entry is a private member of Mylist ListEntry entry[MAX_LIST]; struct AlbumSong { char songTitle[100]; char artist[100]; char album[100]; char genre[30]; int time; int trackNumber; int year; } //here is the call songList.Retrieve (recordNumber, thisSong); //and heres ... |
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Hi experts I have an atl component which is a leaf invoker component ,ie, it takes progids, input parameters, output parameters and one error string parameter it instanciates the component, and it uses dispatchdriver to invoke the function in question in a given component, the interface is given below. interface ICgateway : IDispatch { [id(1), helpstring("method Invoke")] HRESULT Invoke([in] VARIANT * ... |
HI I am having troubles figuring out how I pass my number I generate to an array. Do I take my variable numbers and use that. For example my array name would be int values[] would I have it like this int values number[]. Iam not sure I cant find any tutorials on how to get started. So if someone could ... |
#include #include # define Line_size 200 int processing(int lineCount, char harbour[Line_size][Line_size]) { int i; for(i=0;i |
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hello, i want to pass an array and 2 more integer elements in the routine of thread in pthread in c. i know i need to use structure for the same. i am using pointer to that structure in this case. i need to know--- what will happen if i make changes on the array which i have passed in the ... |
#include #define CSIZE 4 typedef struct Names { char SzFirst[100]; char SzLast[100]; }Family; typedef struct Student { Family Handle; float Grade[3]; float Average; }student; void EatLines() { while(getchar()!='\n') continue; } void FillArr(student **std,int Size) { float sum=0; for(int i=0;iHandle.SzFirst,std[i]->Handle.SzLast); EatLines(); printf("Please enter 3 scores of some of your exams"); ... |
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#include #include #define SIZE 100 int chineseYear(); int calAge(); int i,birthYear[SIZE], birthMonth[SIZE], birthDay[SIZE],currentYear[SIZE],currentMonth[SIZE],currentDay[SIZE]; char opt,name[SIZE][20]; int years[SIZE]; int months[SIZE]; int days[SIZE]; void main() { for(i=0;i |
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