I'm starting to learn C by reading K&R and going through some of the exercises. After some struggling, I was finally able to complete exercise 1-19 with the code below:
/* ...
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Good day all,
I have two array which I want to copy some data from the first array to the second array without repeating any values in the second array.Could someone tell ... |
In my C program I am trying to copy an array of char's to another array whilst removing the first element (element 0).
I have written:
char array1[9];
char array2[8];
int i, j;
for(i = 1, ...
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What is wrong with this statement? It doesn't copy right.
memcpy(new_board1, board, sizeof(board));
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Refering to http://www.devx.com/tips/Tip/13291, it says that I can use memcpy with the size to copy determined by sizeof(), however, isn't the array pointing to a pointer?
Other than iterating through ... |
I need to profile an application which performs a lot of array copies, so I ended up profiling this very simple function:
typedef unsigned char UChar;
void copy_mem(UChar *src, UChar *dst, unsigned int ...
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I've been trying to figure out the best way to copy Linux ARP table into an array, I just need IP and MAC address. I have tried copying the /proc/net/arp file, ... |
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I have two Arrays and I want to get the dot product.
How do I get the values of vek and vec into xmm0 and xmm1?
And how do I get the Value ... |
What's the canonical way to copy an array in C++? If we're copying a POD, we can use memcpy (but there could be a more efficient alternative if we know that the blocks are suitably aligned). Regardless of whether the array consists of POD's, we could use a loop such as: #include template void CopyArray(T *pdest, T const *psource, ... |
Frederick Gotham wrote:[color=blue] > I want to copy an array of objects. > > If it were C, I'd simply do: > > memcpy( target_array, source_array, sizeof target_array ); > > > However, this won't suffice for objects in C++. > > > Does the C++ STL provide a facility for copying arrays of objects, or must > I write my ... |
I have a 2D Array of Integers A[3][5]. I would like to copy it to another array B[3][5] taking each row at a time. They are both initialized as pointers to pointers. I would like to use something like the following but it doesn't seem to work for (i=0; i < 3; i++) { while(*A[i]++ = *B[i]++) ; } |
Victor Bazarov Below you will find some code I wrote to see if I could wrap array copying (especially for multi-dimensional arrays) in a simple class and/or function. It seems to work fine for one-dimensioned arrays as well as two-dimensioned ones. I am sure three- or more-dimensioned array are just as OK here. My concern was that I couldn't use 'std::copy' ... |
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As part of a program I'm currently writing I'd like to copy values from 1 array to another. More specifically-I have 2 arrays. The user will fill the first arrays with 1s and 0s from stdin. I would like to search through this array and if the value is a 1 I would like to copy it to the same location ... |
Hi everyone! I have a c program that will create a 2xm array, and my goal is to have the second row increment from zero to m and then have the first row copy the second row (i could increment the first row too, but for practice, i want to see if i can copy the data in the second row ... |
Hi i'm currently working on trying to create a concentric magic square for an array of size n. So far what i have done in my method was determine the smalles magic square i can generate. i.e if n is even the smallest magic square i can make is is a 4 x4 and if n is odd a 3 x ... |
Hi i'm currently working on trying to create a concentric magic square for an array of size n. So far what i have done in my method was determine the smalles magic square i can generate. i.e if n is even the smallest magic square i can make is is a 4 x4 and if n is odd a 3 x ... |
18. Array Copying cboard.cprogramming.com |
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Two files FA and FB whose names are entered on the keyboard contain integers sorted in ascending order. Write a program that copies the contents of FA and FB, respectively, in the dynamic tables TABA and TABB in main memory. Tables TABA and TABB are merged into a third sorted array in ascending TABC. After the merger, the TABC table is ... |
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Have problems with copying my array! Guys i have this program i created. I have made a random number generator to the array, and then wanted to use to sorting functions, the functions seem to work properly. However, i wanted to make copies of the original array and work with the copies and functions so that the original doesnt get modified. ... |
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Describe what doesn't work - doesn't work can range from "you get one extra character in your array at times" to "the application crashes out with a segfault". I don't see anything directly wrong with your approach as such. By the way, if your struct has char *cmd, then you could actually do a different thing: malloc some memory for your ... |
In my effort to learn C on my own, I am using Stephen Prata's book; it has some great assignments. This is the assignment: Write a program that initializes an array-of-double and then copies the contents of the array into two other arrays. (All three arrays should be declared in the main program.) To make the first copy, use a function ... |
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If I did your homework for you, then you might pass your class without learning how to write a program like this. Then you might graduate and get your degree without learning how to write a program like this. You might become a professional programmer without knowing how to write a program like this. Someday you might work on a project ... |
I have to thank you everyone, and then appologize that my description make you misunderstand about my question. What I really want to do is to pass a pointer to another variable. For example, buffer points to 0x0000 then when I assigned mydata = buffer mydata will point to 0x0000 then I would like to reallocate buffer so that it can ... |
32. array copying cboard.cprogramming.com |
I need to make a program that copies arrays among functions using both pointer notation and array notaion. I can't see mto get it to work to pass the array on to the next. Any help would be greatly appreciated. Code: #include #define SIZE 6 double main_array(void); double array_notation(double ar[], int); double pointer_notation(double ar[], int); double largest_value(double ar[], int); double ... |
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#include #include typedef struct { char Jump[ 3 ]; char Manufacturer[ 8 ]; char BytesPerSector[ 2 ]; } Disk; // if you use a pointer it must point to something before its used. Disk* theDisk; char array[40]={'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', ...}; // make theDisk point to a valid instance of Disk memcpy(theDisk->Manufacturer, &array[3], 5); ... |
Why would you want to do that anyway? The answer is "Simply, because the function was implemented with a string in mind, and is not supposed to copy integer arrays". You shouldn't try it even if it could do so. There are a lot of differences between a string and an integer array for example the string is nul terminated. Why ... |
by "its not working" i meant it as an invalid logic,sorry for the misconception. anyways,i know that it will create an infinite loop,but what i dont know is whats the proper logic for making a copy constuctor which involves array, Can i use the memcpy function to do this..if yes.. then can you please elaborate? |
Look up pass by reference. Currently, your function has the arguments being passed by value, which means the parameters are copies. Clearly, working on the copies won't change the original. While you could circumvent pass by value by passing pointers instead (which is what you would do in C), since you are using C++, you probably want to use pass by ... |
Guys i have this program i created. I have made a random number generator to the array, and then wanted to use to sorting functions, the functions seem to work properly. However, i wanted to make copies of the original array and work with the copies and functions so that the original doesnt get modified. After that test the number of ... |
Hello, I have an array of size 10x10 and another array of size 12x12. Firstly perhaps this isn't the best way of going about it, but I need to place the contents of the smaller array inside the middle of larger array. The larger array must stay 12x12 so it's contents would bascially be overwritten. The small array of 10x10 contains ... |
Hi all, IM currently programming good old ANSI C for a PALM application. My problem is i have a global var in the form of an array containing several structs. For the sake of simplicity and to save the current settings the user might have entered previously, i make a copy of the current struct he wants to modify (typedef struct ... |
myEntry[0].talkerProdPos = 1 myEntry[1].talkerProdPos = 0 myEntry[2].talkerProdPos = 0 myEntry[3].talkerProdPos = 0 myEntry[4].talkerProdPos = 0 myEntry[5].talkerProdPos = 0 myEntry[6].talkerProdPos = 0 myEntry[7].talkerProdPos = 0 myEntry[8].talkerProdPos = 0 myEntry[9].talkerProdPos = 2 myEntry[10].talkerProdPos = 0 myEntry[11].talkerProdPos = 3 myEntry[12].talkerProdPos = 0 myEntry[13].talkerProdPos = 0 myEntry[14].talkerProdPos = 0 myEntry[15].talkerProdPos = 0 myEntry[16].talkerProdPos = 0 myEntry[17].talkerProdPos = 0 myEntry[18].talkerProdPos = 4 myEntry[19].talkerProdPos = 5 myEntry[20].talkerProdPos ... |
You need to break it down into tasks. First learn how to input numbers and assign them to variables. That's usually described in Chapter one or two of whatever book you may be using. Then you'll have to learn how to use arrays which is usually around chapter 5 or so. If the concept of functions is unclear, you may have ... |
Well, i'm working at the following programm and i cannot find any solution. The first part where the stp[4][6] array is being filled by random values is ok. The second part cosist of a function which cories all values fron stp array to pap array. This part isn't working. I've tryied a lot thigs but nothing worked. I'm trying to complete ... |
/* copying structure array name into another string array*/ #include #include int main(){ int i=0; int j,k,l,m; int choice=1; char words[20]; struct customer{ char name[20]; int account; int current; int debt; }cu[20]; printf("\n ******enter details******* \n"); while (choice==1){ printf("\n enter customer detials\n"); printf("\ncustomer name:"); scanf("%s",&cu[i].name); printf("\n account no:"); scanf(" %d",&cu[i].account); i++; printf("\n..enter 1 to continue"); scanf("%d",&choice); } /*copying structure array name ... |