C 中允许的静态数组的最大大小是多少? [英] What maximum size of static arrays are allowed in C?

问题描述

In my algorithm I know work with static arrays, no dynamic ones. But I sometimes reach the limit of the stack. Am I right, that static arrays are stored to the stack?

Which parameters affect my maximum stack size for one C programm?

Are there many system parameters which affect the maximal array size? Does the maximunm no. of elements depend of the array type? Does it depend on the total system RAM? Or does every C programm have a static maximum stack size?

解决方案

Most of your questions have been answered, but just to give an answer that made my life a lot easier:

Qualitatively the maximum size of the non-dynamically allocated array depends on the amount of RAM that you have. Also it depends on the type of the array, e.g. an int may be 4 bytes while a double may be 8 bytes (they are also system dependent), thus you will be able to have an array that is double in number of elements if you use int instead of double.

Having said that and keeping in mind that sometimes numbers are indeed important, here is a very noobish code snippet to help you extract the maximum number in your system.

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

#define UPPER_LIMIT 10000000000000 // a very big number

int main (int argc, const char * argv[])
{
    long int_size = sizeof(int);
    for (int i = 1; i < UPPER_LIMIT; i++)
    {
        int c[i];
        for (int j = 0; j < i; j++)
        {
            c[j] = j;
        }
        printf("You can set the array size at %d, which means %ld bytes. 
", c[i-1], int_size*c[i-1]);
    }    
}

P.S.: It may take a while until you reach your system's maximum and produce the expected Segmentation Fault, so you may want to change the initial value of i to something closer to your system's RAM, expressed in bytes.

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