Question

How to dynamically allocate a 2D array if the number of row is not defined? (in C-Language)

Need an example code.

Answer 1

By not defined , you mean they will be known at run-time ,

Well if thats the case , here we go!!

#include <stdio.h>
#include <stdlib.h>

int main()
{

//define variables
int row,column;

//input values
scanf("%d",&row);
scanf("%d",&column);

//allocate 2D array

int (*arr)[row] = malloc(row * sizeof(*arr));

//check it

for(int i = 0; i < row; i++) {
for(int j = 0; j < column; j++) {
arr[i][j] = 0;
printf("%d",arr[i][j]);
printf(" ");
}
printf("\n");
}

return 0;
}

Inputs - 2 3