Global array

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Global array #468503 10/08/17 16:59 10/08/17 16:59
Joined: Dec 2013 Posts: 568 Fuerth, DE Sphin OP User
Sphin OP User Joined: Dec 2013 Posts: 568 Fuerth, DE	Code: var Trend[5]; void main() { int i; for(i = 0; i < 100; i++) { Trend[i] = i; printf("nTrend[%d]: %.0f",i,Trend[i]); } } Output: Code: ... Trend[97]: 97 Trend[98]: 98 Trend[99]: 99 How many elements does this array contain?

Re: Global array [Re: Sphin] #468505 10/08/17 17:47 10/08/17 17:47
Joined: Jun 2013 Posts: 1,609 D DdlV Serious User
DdlV Serious User D Joined: Jun 2013 Posts: 1,609	Hi Sphin, I believe the correct question is: What have you coded to be sure your intended # of elements hasn't been exceeded? HTH.

Re: Global array [Re: DdlV] #468548 10/09/17 16:51 10/09/17 16:51
Joined: Dec 2013 Posts: 568 Fuerth, DE Sphin OP User
Sphin OP User Joined: Dec 2013 Posts: 568 Fuerth, DE	Hi DdlV, the story behind: I had a problem building the average of a number of values of an array filled through a loop - it was always too high. The cause: there was a Trend[5]-element that I thought was not permitted to exist. I expected the script to crash in such a case. So I extended the try a bit, I also tried a higher number but with #115 the script always crashes. This works only if the array was defined as global, defined as local the script crashes as it should. Okay, seems to be a C secret ... bye

Re: Global array [Re: Sphin] #468560 10/10/17 06:23 10/10/17 06:23
Joined: Jul 2000 Posts: 27,978 Frankfurt jcl Chief Engineer
jcl Chief Engineer Joined: Jul 2000 Posts: 27,978 Frankfurt	C/C++ does not check array lengths, so you can write past the array size. What then happens depends on what's in the memory past the array. Chance is that's another global array, or some variable that you then overwrite.

Re: Global array [Re: jcl] #468576 10/10/17 17:23 10/10/17 17:23
Joined: Dec 2013 Posts: 568 Fuerth, DE Sphin OP User
Sphin OP User Joined: Dec 2013 Posts: 568 Fuerth, DE	Thanks, I didn't know this.

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