How to implement these loops ...

[Santa C Maria]

This is probably a rather silly question. I would be glad, if you
can give me a hint. I want to implement a number of loops in this
manner:
   for ( i[0] = 0; i[0] < x[0]; ++i[0] ) {
      for ( i[1] = 0; i[1] < x[1]; ++i[1] ) {
	 ......
	 ......
	    for ( i[m-1] = 0; i[m-1] < x[m-1]; ++i[m-1] ) {
	       do_something_here();
	    }
	 ......
      }
   }

do_something_here() is thus executed x[0]*[x[1]* ... *x[m-1] times.
The problem is that m, x[0], ... x[m-1] all depend upon run-time
values. The question is how do I code this? 

Thanks in advance for your help.