A variable length array is an array in C99 and other languages whose size is unknown at compile time; instead, it's determined at runtime.
Questions tagged [variable-length-array]
413 questions
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votes
4 answers
ADD elements of an array with a given condition
There is an array of n students( stu[n]).If gender is boy then my code adds
for boy b, 2nd,4th,6th,........even position elements of array and
for girl g, 1st,3rd,5th....odd position elements of array.
1> Gender of boys denoted by b.
2> Gender…
user11802931
-4
votes
2 answers
Creating array with non constant sizes
I'm currently working on an assignment where I must find a way to output the longest common subsequence of two strings. In all of the other places I have found implementations of this code, they all share one similarity: multiple arrays are…
drewalc
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votes
1 answer
Why variable sized arrays cause Wrong Answer on Codechef?
int n;cin>>n;
int arr[n]{};
I have a small problem ,why is this decleration of array wrong?I have used it on Codechef several times until recently i got a WA!
After this I declared array as,
int n;cin>>n;
int arr[1001]{0} ; //max size of input…
rookieprogrammer
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votes
2 answers
Where does variable length array/alloca allocate in stack
I am really curious about how alloca() function works and therefore, I have written a simple test program as follows:
int test() {
int a = 0;
int e;
char tmp2[a]; //alloca
int d;
char* tmp3 = new char[2];
tmp2[100] = 1;
…
Truong Hua
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-4
votes
1 answer
Pitfalls of a variable size array in C
The following snippet compiles properly using standard gcc. What are possible pitfalls here? --especially for kernel level development.
int n;
f(){n=2;}
g(){int b[n];}
main(){
int a[n];
f();
g();
}
Ali Abbasinasab
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-5
votes
2 answers
Cannot Figure out Why "sizeof(msg) = 0"
I need to find the length of a Message which was entered. I have put all the characters in the msg into an array msg[], but when I check for the size of this array, it comes out to zero.
Thank you for your help.
#include
#define SIZE…
Humza Ahmed
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-5
votes
1 answer
Dynamic initialization of 2d array in c++ in a specific way
if we initialize a 2d array in c++ like:
int n;
cin>>n;
int a[n][1000]= {0};
why does it compile but not work properly? I tried to access a[4][2] which gave me 2 while it should give me 0 while in case of:
int n;
cin>>n; int…
ANUBHAV UJJAWAL
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- 4
-9
votes
1 answer
length of array at runtime in C++
I have been asked to prove that one can set the array length in the program, and it does not need to be determined at compile time. I have following code:
#include
using namespace std;
int main()
{
int x, myarray[x];
cout << "Enter…
user3922546
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