2d array making dynamically

#1

how to make 2d array dynamicaly

#2
#3

tell me in c++ using new

#4

do u need to understand how to pass it in function argument or
just declare in the function
?

#5

i have not any knowledge of malloc function.

#6

if you don’t know i will repost my doubt

#7

see. I can help u for this

“malloc” or “memory allocation” method in C is used to dynamically allocate a single large block of memory with the specified size. It returns a pointer of type void which can be cast into a pointer of any form. It initializes each block with default garbage value.

Syntax:

ptr = (cast-type*) malloc(byte-size)

this is the approach we used ealier to declare 2D array
int *arr = ( int *) malloc (r * c * sizeof ( int ));

probbably no one makes it this way

but now
suppose we have to make n*m matrix
then we can simply declare

int arr[n][m]

or if u know vectors then

vector<vector<data_type>> name_of_matrix(row , vector(col,initial Value));

vector<vector> dp(n , vector(m,0));

#8

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