interleave two halves of an array

interleave.c

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

static void swap(int* data, int c) {
	for (int i=0; c > 0; i+=2, --c) {
		int tmp = data[i];
		data[i] = data[i+1];
		data[i+1] = tmp;
	}
}

static void interleave(int* data, int size) {
	if (size % 2 == 1) {
		size--;
	}
	int half = size / 2;
	int j = 1;
	for (int i=half-1; i>0; --i) {
		swap(data+i, j++);
	}
}

int main(int argc, char** argv) {
	int size = argc-1;
	int* data = (int*) malloc(sizeof(int) * size);
	for (int i=1; i<argc; ++i) {
		data[i-1] = atoi(argv[i]);
	}
	interleave(data, size);
	for (int i=0; i<size; ++i) {
		printf("%d ", data[i]);
	}
	printf("\n");
	delete data;
}