malloc fails for 5×10^8 doubles on 8GB Windows system

[nenyan]

#include <stdio.h>
#include <stdlib.h>
#define N 250000000

int main()
{
    int i; 
    double *x;

    if(!(x = malloc(N * sizeof(double)) ))
            printf("memory error \n");

free(x);
}

When N is larger than 2.5*10^8, it appears memory error. I have 8GB memory. The system is Windows7. How to solve this problem. I hope N=5*10^8 at least.

 

[I like Serena]

A 64-bits compiler will probably help.
As it is you are overrunning the range of a 32-bits integer.