memset is a C standard library function that sets the first N bytes of the block of memory to the specified value (interpreted as an unsigned char)
Questions tagged [memset]
502 questions
-2
votes
1 answer
explain the functioning of memset(arr, 10, n*sizeof(arr[0]))?
I call this function:
memset(arr, 10, n*sizeof(arr[0]))
I have this output:
168430090 168430090 168430090 168430090 168430090 168430090 168430090 168430090 168430090 168430090
Why?
Amit Karmakar
- 11
- 2
-2
votes
2 answers
Segmentation fault (core dumped) with memset in char pointer in C++
I have two version of code. One works and the other doesnot.
Working code is a follows :
int main()
{
int i;
char str[] = "Hello World";
std::cout<<"The string value before memset is : "<
nzy
- 854
- 2
- 15
- 28
-2
votes
2 answers
Memset with assignment
I have a problem : "Multiple test (t test), each test prints all strings with length N and contains exactly H numbers 1."
Here is my code:
#include
#include
using namespace std;
typedef long long LL;
LL t,N,H;
LL…
Duck
- 15
- 1
- 3
-2
votes
1 answer
Why memset function doesn't work?
Why memset function doesn't work inside c++ function with char pointers?
void change(char* input){
memset(input, 'a', strlen(input));
}
int main(){
char* p = "foo";
cout << p << endl;
change(p);
cout << p << endl;
}
-2
votes
1 answer
Hardfault exception when calling memset on STM32
Starting up a STM32 i try to allocate memory for a struture pointed to by a pointer.
TLxbEvents *LxbEvents
memset((void*)LxbEvents, 0, sizeof(TLxbEvents));
Looking into the disassembly, it crashes always on the line
STMCS r0!,{r2-r3,r12,lr}
I…
Aeonos
- 365
- 1
- 13
-2
votes
1 answer
using memset to initialise the int array
#include
using namespace std;
int main()
{
int arr[1010];
memset(arr,1,sizeof(arr));
cout<
satyam shekhar
- 1
- 2
-2
votes
1 answer
Use of memset to prevent ''variable-sized object may not be initialized'
I am trying to set values to a 2D array (envisage a game board or a some grid) using the code below but I receive 'variable-sized object may not be initialized' error.
I tried solving it using memset but to no avail.
Many thanks and some hints would…
idol2k
- 5
- 4
-2
votes
1 answer
What's the difference between these two memset?
int color[1001][1001];
int m,n;
m=10;
n=10;
memset(color,0,sizeof(color));
memset(color,0,sizeof(color[0][0])*m*n );
What's the difference between these two memset statements?
Any answer will be highly appreciated. Thanks in advance.
cola
- 12,198
- 36
- 105
- 165
-2
votes
4 answers
memset on vector is making its size 0
I was trying to clear all data in a vector without changing its size using memset. But after memset operation size of vector becomes 0. Here is the exact code:
std::vector…
SS306
- 157
- 1
- 3
- 9
-2
votes
1 answer
Passing byte[] as IntPtr by PInvoke to memset
I need to pass a byte array to memset, which due to P/Invoke clunkiness takes IntPtr. Tested by hand, it works, but I am seeking theoretical confirmation. Is this method correct?
[DllImport("msvcrt.dll", EntryPoint = "memset", CallingConvention =…
ArekBulski
- 4,520
- 4
- 39
- 61
-2
votes
1 answer
char var[] = {0}; and char var[1]; are equivalent in C?
what this line will do?
char var[] = {0};
Is this equivalent to the following?
char var[1];
memset(var, 0, NULL);
Arun
- 2,247
- 3
- 28
- 51
-3
votes
2 answers
C++, recreate memset with pointers and address of operators
tl;dr; How to reproduce memset with basic c++?
I am trying to figure out how memset works , and to see if I can reproduce it within normal c++ using pointers and address.
This is what I've got so far.
void test_memset( void * origin, uint8_t…
Danilo
- 1,017
- 13
- 32
-3
votes
2 answers
How long does memory written with memset() stay in memory without calling free()?
On Linux.
Hi. I'm sure there are many factors involved where the OS simply garbage-dumps memory allocated with memset() without calling free(), but I was wondering if anyone has a good estimation on this? That's really all I want to know.
There is…
Tdizzle
- 53
- 8
-3
votes
1 answer
Why is memset causing problem despite being used on built-in types?
I am very new to C++ and was making a submission to this problem on Codeforces and suddenly found that using memset() was causing Wrong answer to one of the test cases.
Here is the test case:
Input:
4 4
3 3 3 5
Participant's output
NO
Jury's…
asn
- 2,408
- 5
- 23
- 37
-3
votes
5 answers
C, memset a double array failed
I want to declare a double type array dynamically, so here is my code
void function(int length, ...)
{
...
double *a = malloc(sizeof(double) * length);
memset(a, 1, sizeof(double) * length);
for (int i = 0; i < length; i++)
{
…
GoingMyWay
- 16,802
- 32
- 96
- 149