CODEWITHSUNDEEP
c++
cfire19045
cfire19045

Reputation: 145

Silent runtime error with 2D arrays

I'm creating 2D arrays, with the structure of an static array with dynamic arrays. The code is below:

#include <iostream>
#include <time.h>
#include <stdlib.h>
using namespace std;

#define MAT_SIZE 100000

typedef float* DynMat[MAT_SIZE];

int main()
{
   int r, c;

   DynMat matDyn, matDynAns;

   for (r = 0; r < MAT_SIZE; r++)
   {
      matDyn[r] = new float[MAT_SIZE];
      matDynAns[r] = new float[MAT_SIZE];
      for (c = 0; c < MAT_SIZE; c++)
      {
         matDyn[r][c] = 0;
         matDynAns[r][c] = 0;
      }
   }

   cout << "hello" << endl;
}

I believe there is a silent runtime error being thrown during my initialization of the matrices, because the code compiles and runs, yet nothing is printed.

Upvotes: 0

Views: 145

Answers (1)

Davis Herring
Davis Herring

Reputation: 39778

Your program gradually allocates 80 GB of memory. It’s not printing anything because it’s swapping forever instead. (This is similar to thrashing, but instead of repeatedly loading a “few” pages it’s just linearly filling many of them.)

Upvotes: 2

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