array arithmetic in C?

pivoxa15

int f[5];

Is it possible to do

f[i]+=1;

inside a valid for loop?

If not than how can I increment integers stored in an arrary for each i in C?

Thanks

Diane_

I don't see anything wrong with it, but I tried it and it works just fine.

jtbell

Quote by pivoxa15

int f[5];
Is it possible to do
f[i]+=1;

Sure, so long as i has a valid value for an index to that array, namely in the range 0...4.

Actually, a C compiler will cheerfully let you use a value of i outside that range, but then you'll be incrementing the contents of some memory location outside the array. This sort of thing produces bugs that can be very difficult to track down unless you step through the code with a debugger.

faust9

One of the best ways to learn C is to test these sorts of questions.

Code:

#include <stdio.h>

main()
{
  int f[5]={0}, i;
  
  for(i=0;i<5;i++)
  {
	printf("               i = %d \n", i);
	printf("            f[i] = %d \n", f[i]);
	f[i]+=i;
        printf("incremented f[1] = %d \n", f[i]);
  }

}

Don't be afraid to test these things when you have a question. A simple program like the one above will usually clear things up in a jiffy.

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pivoxa15	array arithmetic in C? int f[5]; Is it possible to do f[i]+=1; inside a valid for loop? If not than how can I increment integers stored in an arrary for each i in C? Thanks

Diane_ Recognitions: Homework Help	I don't see anything wrong with it, but I tried it and it works just fine.