How to declare the size of an array at runtime in C?

Question

I basically want to the C of equivalent of this (well, just the part with the array, I don\'t need the class and string parsing and all that):

public class E         


        

Answer 1

In C, you can do that with this, if you ignore the error checking:

#include 
static int *foo;

int main(int argc, char **argv)
{
     int size = atoi(argv[1]);
     foo = malloc(size * sizeof(*foo));
     ...
}

If you don't want a global variable and you are using C99, you could do:

int main(int argc, char **argv)
{
    int size = atoi(argv[1]);
    int foo[size];
    ...
}

This uses a VLA - variable length array.