c infiite array

1   int main(int argc, char *argv[])
2   {
3       int i;
4    
5       double* p;    // We uses this reference variable to access
6   		     // dynamically created array elements
7    
8       p = calloc(10, sizeof(double) );  // Make double array of 10 elements
9    
10       for ( i = 0; i < 10; i++ )
11   	  *(p + i) = i;            // put value i in array element i
12    
13       for ( i = 0; i < 10; i++ )
14   	  printf("*(p + %d) = %lf\n", i, *(p+i) );
15    
16    
17       free(p);      // Un-reserve the first array
18    
19       putchar('\n');
20    
21       p = calloc(4, sizeof(double) );  // Make a NEW double array of 4 elements    
22      
23       // ***** Notice that the array size has CHANGED !!! ****
24
25       for ( i = 0; i < 4; i++ )
26   	  *(p + i) = i*i;            // put value i*i in array element i
27    
28       for ( i = 0; i < 4; i++ )
29   	  printf("*(p + %d) = %lf\n", i, *(p+i) );
30    
31       free(p);      // Un-reserve the second array
32   }
33