exercise4.c

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

int main(void)
{
  int i,j;
  unsigned long long **m;
  unsigned long long **mt;

  while(1)
  {
    // allocate matrix m
    m = malloc(1000*sizeof(unsigned long long*));
    if(m == NULL) return -1;
    for(i=0;i<1000;i++)
    {
      m[i] = malloc(1000*sizeof(unsigned long long));
      if(m[i] == NULL) return -1;
    }

    // allocate matrix mt
    mt = malloc(1000*sizeof(unsigned long long*));
    if(mt == NULL) return -1;
    for(i=0;i<1000;i++)
    {
      mt[i] = malloc(1000*sizeof(unsigned long long));
      if(mt[i] == NULL) return -1;
    }

    for(i=0;i<1000;i++)
      for(j=0;j<1000;j++)
        m[i][j] = 1000*i+j;

    // transpose matrix m, write to mt
    for(i=0;i<1000;i++)
      for(j=0;j<1000;j++)
        mt[i][j] = m[j][i];

    // free matrices m and mt
    free(m);
    free(mt);
  }

  return 0;
}