#include <stdio.h>
#include <stdlib.h>
#include <string.h>
 
void swapping(int dim, int size, void* n1, void *n2)
{
   int s = dim * size;
   char a[s];  //store data, unreadable
   memcpy(a, n2, s);
   memcpy(n2, n1, s);
   memcpy(n1, a, s);
}
 
int main(void) {
 
	double t[10][3];
	t[1][0] = 123.0000;
    t[1][1] = 324.1231;
    t[1][2] = 923.9992;
 
	swapping(3, sizeof(double), &t[1], &t[2]);
 
	for(int i = 0; i < 3; i++){
		printf("t1: %f\n", t[1][i]);
		printf("t2: %f\n", t[2][i]);
	}
 
 
	return 0;
}
 

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