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Multiple variable rules in for() statement
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Multiple variable rules in for() statement


  • Subject: Multiple variable rules in for() statement
  • From: Jonathon Kuo <email@hidden>
  • Date: Thu, 12 Nov 2009 11:29:04 -0800

I can't chance upon the right incantation for using both an existing variable and an inline new one in a for loop. I've boiled this down to a trivial show case, same results for both gcc 4.0.1 and 4.2.1:

  int i;
   . . .
  for (i=0, int m=0; i<5; i++) { . . . };
  printf("Final value of i: %d\n",i);

error: syntax error before ‘int’
error: syntax error before ‘)’ token

So I tried this:

  int i;
   . . .
  for (int m=0,i=0; i<5; i++) { . . . };
  printf("Final value of i: %d\n",i);

error: redefinition of ‘i’

Is there a rule that ALL initialized loop variables are either new and local to the loop, or that none are? Surely Im doing something wrong here!


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